| Current Path : /home/usr.opt/mysql57/mysql-test/suite/opt_trace/r/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : /home/usr.opt/mysql57/mysql-test/suite/opt_trace/r/filesort_pq.result |
SET optimizer_trace_max_mem_size=1048576;
SET end_markers_in_json=off;
SET optimizer_trace="enabled=on,one_line=off";
#
# WL#1393 - Optimizing filesort with small limit
# WL#5834 - Add optimizer traces for sorting
#
CREATE TABLE t1(f0 int auto_increment primary key, f1 int, f2 varchar(200));
INSERT INTO t1(f1, f2) VALUES
(0,"0"),(1,"1"),(2,"2"),(3,"3"),(4,"4"),(5,"5"),
(6,"6"),(7,"7"),(8,"8"),(9,"9"),(10,"10"),
(11,"11"),(12,"12"),(13,"13"),(14,"14"),(15,"15"),
(16,"16"),(17,"17"),(18,"18"),(19,"19"),(20,"20"),
(21,"21"),(22,"22"),(23,"23"),(24,"24"),(25,"25"),
(26,"26"),(27,"27"),(28,"28"),(29,"29"),(30,"30"),
(31,"31"),(32,"32"),(33,"33"),(34,"34"),(35,"35"),
(36,"36"),(37,"37"),(38,"38"),(39,"39"),(40,"40"),
(41,"41"),(42,"42"),(43,"43"),(44,"44"),(45,"45"),
(46,"46"),(47,"47"),(48,"48"),(49,"49"),(50,"50"),
(51,"51"),(52,"52"),(53,"53"),(54,"54"),(55,"55"),
(56,"56"),(57,"57"),(58,"58"),(59,"59"),(60,"60"),
(61,"61"),(62,"62"),(63,"63"),(64,"64"),(65,"65"),
(66,"66"),(67,"67"),(68,"68"),(69,"69"),(70,"70"),
(71,"71"),(72,"72"),(73,"73"),(74,"74"),(75,"75"),
(76,"76"),(77,"77"),(78,"78"),(79,"79"),(80,"80"),
(81,"81"),(82,"82"),(83,"83"),(84,"84"),(85,"85"),
(86,"86"),(87,"87"),(88,"88"),(89,"89"),(90,"90"),
(91,"91"),(92,"92"),(93,"93"),(94,"94"),(95,"95"),
(96,"96"),(97,"97"),(98,"98"),(99,"99");
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 100;
f0 f1 f2
1 0 0
2 1 1
3 2 2
4 3 3
5 4 4
6 5 5
7 6 6
8 7 7
9 8 8
10 9 9
11 10 10
12 11 11
13 12 12
14 13 13
15 14 14
16 15 15
17 16 16
18 17 17
19 18 18
20 19 19
21 20 20
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
31 30 30
32 31 31
33 32 32
34 33 33
35 34 34
36 35 35
37 36 36
38 37 37
39 38 38
40 39 39
41 40 40
42 41 41
43 42 42
44 43 43
45 44 44
46 45 45
47 46 46
48 47 47
49 48 48
50 49 49
51 50 50
52 51 51
53 52 52
54 53 53
55 54 54
56 55 55
57 56 56
58 57 57
59 58 58
60 59 59
61 60 60
62 61 61
63 62 62
64 63 63
65 64 64
66 65 65
67 66 66
68 67 67
69 68 68
70 69 69
71 70 70
72 71 71
73 72 72
74 73 73
75 74 74
76 75 75
77 76 76
78 77 77
79 78 78
80 79 79
81 80 80
82 81 81
83 82 82
84 83 83
85 84 84
86 85 85
87 86 86
88 87 87
89 88 88
90 89 89
91 90 90
92 91 91
93 92 92
94 93 93
95 94 94
96 95 95
97 96 96
98 97 97
99 98 98
100 99 99
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 100 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 100"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true,
"use_tmp_table": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"sort_cost": 100,
"new_cost_for_plan": 122.49,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 100,
"rows_estimate": 110,
"row_size": 219,
"memory_available": 262144,
"chosen": false,
"cause": "quicksort_is_cheaper"
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 100,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 25192,
"sort_mode": "<sort_key, packed_additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 30;
f0 f1 f2
1 0 0
2 1 1
3 2 2
4 3 3
5 4 4
6 5 5
7 6 6
8 7 7
9 8 8
10 9 9
11 10 10
12 11 11
13 12 12
14 13 13
15 14 14
16 15 15
17 16 16
18 17 17
19 18 18
20 19 19
21 20 20
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 30"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 110,
"row_size": 219,
"memory_available": 262144,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 7040,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 0;
f0 f1 f2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
],
"empty_result": {
"cause": "Zero limit"
}
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
SELECT * FROM t1 ORDER BY f2 DESC, f0 LIMIT 30;
f0 f1 f2
100 99 99
99 98 98
98 97 97
97 96 96
96 95 95
95 94 94
94 93 93
93 92 92
92 91 91
91 90 90
10 9 9
90 89 89
89 88 88
88 87 87
87 86 86
86 85 85
85 84 84
84 83 83
83 82 82
82 81 81
81 80 80
9 8 8
80 79 79
79 78 78
78 77 77
77 76 76
76 75 75
75 74 74
74 73 73
73 72 72
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f2 DESC, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f2` desc,`t1`.`f0` limit 30"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2` desc,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2` desc,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "desc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 262144,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 13120,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 ORDER BY f2 DESC, f0 LIMIT 0;
f0 f1 f2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f2 DESC, f0 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f2` desc,`t1`.`f0` limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
],
"empty_result": {
"cause": "Zero limit"
}
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 20;
f0 f1 f2
12 11 11
13 12 12
14 13 13
15 14 14
16 15 15
17 16 16
18 17 17
19 18 18
20 19 19
21 20 20
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
31 30 30
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 20 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 20"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 20,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 262144,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 21,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 8888,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 0;
f0 f1 f2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
],
"empty_result": {
"cause": "Zero limit"
}
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 10 OFFSET 10;
f0 f1 f2
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
31 30 30
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 10 OFFSET 10 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 10,10"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 20,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 262144,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 21,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 8888,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 0 OFFSET 10;
f0 f1 f2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 0 OFFSET 10 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 10,0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 10,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 262144,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 11,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 4656,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT CONCAT("hello ", f2) AS foo FROM t1 ORDER BY foo LIMIT 2;
foo
hello 0
hello 1
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT CONCAT("hello ", f2) AS foo FROM t1 ORDER BY foo LIMIT 2 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select concat('hello ',`t1`.`f2`) AS `foo` from `t1` order by `foo` limit 2"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`foo`",
"items": [
{
"item": "concat('hello ',`t1`.`f2`)"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`foo`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"expression": "concat('hello ',`t1`.`f2`)"
}
],
"filesort_priority_queue_optimization": {
"limit": 2,
"rows_estimate": 110,
"row_size": 409,
"memory_available": 262144,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 3,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 1256,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * from t1 ORDER BY rand(2) LIMIT 2;
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * from t1 ORDER BY rand(2) LIMIT 2 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by rand(2) limit 2"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "rand(2)",
"items": [
{
"item": "rand(2)"
}
],
"resulting_clause_is_simple": false,
"resulting_clause": "rand(2)"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 219,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4788
}
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "tmp_field_0"
}
],
"filesort_priority_queue_optimization": {
"limit": 2,
"rows_estimate": 110,
"row_size": 16,
"memory_available": 262144,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 3,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 72,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
set sort_buffer_size= 32768;
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 30;
f0 f1 f2
1 0 0
2 1 1
3 2 2
4 3 3
5 4 4
6 5 5
7 6 6
8 7 7
9 8 8
10 9 9
11 10 10
12 11 11
13 12 12
14 13 13
15 14 14
16 15 15
17 16 16
18 17 17
19 18 18
20 19 19
21 20 20
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 30"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 110,
"row_size": 219,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 7040,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 0;
f0 f1 f2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f1 ASC, f0 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
],
"empty_result": {
"cause": "Zero limit"
}
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
SELECT * FROM t1 ORDER BY f2 DESC, f0 LIMIT 30;
f0 f1 f2
100 99 99
99 98 98
98 97 97
97 96 96
96 95 95
95 94 94
94 93 93
93 92 92
92 91 91
91 90 90
10 9 9
90 89 89
89 88 88
88 87 87
87 86 86
86 85 85
85 84 84
84 83 83
83 82 82
82 81 81
81 80 80
9 8 8
80 79 79
79 78 78
78 77 77
77 76 76
76 75 75
75 74 74
74 73 73
73 72 72
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f2 DESC, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f2` desc,`t1`.`f0` limit 30"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2` desc,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2` desc,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "desc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 13120,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 ORDER BY f2 DESC, f0 LIMIT 0;
f0 f1 f2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f2 DESC, f0 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f2` desc,`t1`.`f0` limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
],
"empty_result": {
"cause": "Zero limit"
}
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 20;
f0 f1 f2
12 11 11
13 12 12
14 13 13
15 14 14
16 15 15
17 16 16
18 17 17
19 18 18
20 19 19
21 20 20
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
31 30 30
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 20 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 20"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 20,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 21,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 8888,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 0;
f0 f1 f2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
],
"empty_result": {
"cause": "Zero limit"
}
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 10 OFFSET 10;
f0 f1 f2
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
31 30 30
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 10 OFFSET 10 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 10,10"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 20,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 21,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 8888,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 0 OFFSET 10;
f0 f1 f2
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 0 OFFSET 10 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 10,0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 10,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 11,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 4656,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
set sort_buffer_size= 32768;
set optimizer_trace_limit=1;
set optimizer_trace_offset=-2;
SELECT SQL_CALC_FOUND_ROWS * FROM t1
ORDER BY f1, f0 LIMIT 30;
f0 f1 f2
1 0 0
2 1 1
3 2 2
4 3 3
5 4 4
6 5 5
7 6 6
8 7 7
9 8 8
10 9 9
11 10 10
12 11 11
13 12 12
14 13 13
15 14 14
16 15 15
17 16 16
18 17 17
19 18 18
20 19 19
21 20 20
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
SELECT FOUND_ROWS();
FOUND_ROWS()
100
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1
ORDER BY f1, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 30"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 110,
"row_size": 219,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 7040,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT SQL_CALC_FOUND_ROWS * FROM t1
ORDER BY f1, f0 LIMIT 0;
f0 f1 f2
SELECT FOUND_ROWS();
FOUND_ROWS()
100
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1
ORDER BY f1, f0 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 0,
"rows_estimate": 110,
"row_size": 219,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 1,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 232,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 20;
f0 f1 f2
12 11 11
13 12 12
14 13 13
15 14 14
16 15 15
17 16 16
18 17 17
19 18 18
20 19 19
21 20 20
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
31 30 30
SELECT FOUND_ROWS();
FOUND_ROWS()
89
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 20 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 20"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 20,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 21,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 8888,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 0;
f0 f1 f2
SELECT FOUND_ROWS();
FOUND_ROWS()
89
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 0,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 1,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 424,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 10 OFFSET 10;
f0 f1 f2
22 21 21
23 22 22
24 23 23
25 24 24
26 25 25
27 26 26
28 27 27
29 28 28
30 29 29
31 30 30
SELECT FOUND_ROWS();
FOUND_ROWS()
89
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 10 OFFSET 10 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 10,10"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 20,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 21,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 8888,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 0 OFFSET 10;
f0 f1 f2
SELECT FOUND_ROWS();
FOUND_ROWS()
89
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 0 OFFSET 10 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 10,0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 100,
"cost": 2
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 33.33,
"cost": 22.488,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 33.33,
"cost_for_plan": 22.488,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 10,
"rows_estimate": 110,
"row_size": 415,
"memory_available": 32768,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 11,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 4656,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
set sort_buffer_size= 327680;
set optimizer_trace_limit=1;
set optimizer_trace_offset=-1;
CREATE TEMPORARY TABLE tmp (f1 int, f2 varchar(20));
INSERT INTO tmp SELECT f1, f2 FROM t1;
INSERT INTO t1(f1, f2) SELECT * FROM tmp;
INSERT INTO tmp SELECT f1, f2 FROM t1;
INSERT INTO t1(f1, f2) SELECT * FROM tmp;
SELECT * FROM t1 JOIN tmp on t1.f2=tmp.f2
ORDER BY tmp.f1, f0 LIMIT 30;
f0 f1 f2 f1 f2
1 0 0 0 0
1 0 0 0 0
1 0 0 0 0
101 0 0 0 0
101 0 0 0 0
101 0 0 0 0
201 0 0 0 0
201 0 0 0 0
201 0 0 0 0
301 0 0 0 0
301 0 0 0 0
301 0 0 0 0
401 0 0 0 0
401 0 0 0 0
401 0 0 0 0
2 1 1 1 1
2 1 1 1 1
2 1 1 1 1
102 1 1 1 1
102 1 1 1 1
102 1 1 1 1
202 1 1 1 1
202 1 1 1 1
202 1 1 1 1
302 1 1 1 1
302 1 1 1 1
302 1 1 1 1
402 1 1 1 1
402 1 1 1 1
402 1 1 1 1
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 JOIN tmp on t1.f2=tmp.f2
ORDER BY tmp.f1, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2`,`tmp`.`f1` AS `f1`,`tmp`.`f2` AS `f2` from (`t1` join `tmp` on((`t1`.`f2` = `tmp`.`f2`))) order by `tmp`.`f1`,`t1`.`f0` limit 30"
},
{
"transformations_to_nested_joins": {
"transformations": [
"JOIN_condition_to_WHERE",
"parenthesis_removal"
],
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2`,`tmp`.`f1` AS `f1`,`tmp`.`f2` AS `f2` from `t1` join `tmp` where (`t1`.`f2` = `tmp`.`f2`) order by `tmp`.`f1`,`t1`.`f0` limit 30"
}
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f2` = `tmp`.`f2`)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
},
{
"table": "`tmp`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
},
{
"table": "`tmp`",
"table_scan": {
"rows": 300,
"cost": 3
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`tmp`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 300,
"access_type": "scan",
"resulting_rows": 300,
"cost": 63.465,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 300,
"cost_for_plan": 63.465,
"rest_of_plan": [
{
"plan_prefix": [
"`tmp`"
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"using_join_cache": true,
"buffers_needed": 1,
"resulting_rows": 500,
"cost": 30005,
"chosen": true
}
]
},
"condition_filtering_pct": 10,
"rows_for_plan": 15000,
"cost_for_plan": 30068,
"chosen": true
}
]
},
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"pruned_by_heuristic": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f2` = `tmp`.`f2`)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`tmp`",
"attached": null
},
{
"table": "`t1`",
"attached": "(`t1`.`f2` = `tmp`.`f2`)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`tmp`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`tmp`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": false,
"resulting_clause": "`tmp`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`tmp`"
},
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 235,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4462
}
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f1"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 1510,
"row_size": 17,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 1500,
"number_of_tmp_files": 0,
"sort_buffer_size": 776,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 JOIN tmp on t1.f2=tmp.f2
ORDER BY tmp.f1, f0 LIMIT 30 OFFSET 30;
f0 f1 f2 f1 f2
3 2 2 2 2
3 2 2 2 2
3 2 2 2 2
103 2 2 2 2
103 2 2 2 2
103 2 2 2 2
203 2 2 2 2
203 2 2 2 2
203 2 2 2 2
303 2 2 2 2
303 2 2 2 2
303 2 2 2 2
403 2 2 2 2
403 2 2 2 2
403 2 2 2 2
4 3 3 3 3
4 3 3 3 3
4 3 3 3 3
104 3 3 3 3
104 3 3 3 3
104 3 3 3 3
204 3 3 3 3
204 3 3 3 3
204 3 3 3 3
304 3 3 3 3
304 3 3 3 3
304 3 3 3 3
404 3 3 3 3
404 3 3 3 3
404 3 3 3 3
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 JOIN tmp on t1.f2=tmp.f2
ORDER BY tmp.f1, f0 LIMIT 30 OFFSET 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2`,`tmp`.`f1` AS `f1`,`tmp`.`f2` AS `f2` from (`t1` join `tmp` on((`t1`.`f2` = `tmp`.`f2`))) order by `tmp`.`f1`,`t1`.`f0` limit 30,30"
},
{
"transformations_to_nested_joins": {
"transformations": [
"JOIN_condition_to_WHERE",
"parenthesis_removal"
],
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2`,`tmp`.`f1` AS `f1`,`tmp`.`f2` AS `f2` from `t1` join `tmp` where (`t1`.`f2` = `tmp`.`f2`) order by `tmp`.`f1`,`t1`.`f0` limit 30,30"
}
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f2` = `tmp`.`f2`)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
},
{
"table": "`tmp`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
},
{
"table": "`tmp`",
"table_scan": {
"rows": 300,
"cost": 3
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`tmp`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 300,
"access_type": "scan",
"resulting_rows": 300,
"cost": 63.465,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 300,
"cost_for_plan": 63.465,
"rest_of_plan": [
{
"plan_prefix": [
"`tmp`"
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"using_join_cache": true,
"buffers_needed": 1,
"resulting_rows": 500,
"cost": 30005,
"chosen": true
}
]
},
"condition_filtering_pct": 10,
"rows_for_plan": 15000,
"cost_for_plan": 30068,
"chosen": true
}
]
},
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"pruned_by_heuristic": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f2` = `tmp`.`f2`)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`tmp`",
"attached": null
},
{
"table": "`t1`",
"attached": "(`t1`.`f2` = `tmp`.`f2`)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`tmp`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`tmp`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": false,
"resulting_clause": "`tmp`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`tmp`"
},
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 235,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4462
}
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f1"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 60,
"rows_estimate": 1510,
"row_size": 17,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 61,
"examined_rows": 1500,
"number_of_tmp_files": 0,
"sort_buffer_size": 1528,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
set optimizer_trace_limit=2;
set optimizer_trace_offset=-2;
SELECT SQL_CALC_FOUND_ROWS * FROM t1 JOIN tmp on t1.f2=tmp.f2
ORDER BY tmp.f1, f0 LIMIT 30 OFFSET 30;
f0 f1 f2 f1 f2
3 2 2 2 2
3 2 2 2 2
3 2 2 2 2
103 2 2 2 2
103 2 2 2 2
103 2 2 2 2
203 2 2 2 2
203 2 2 2 2
203 2 2 2 2
303 2 2 2 2
303 2 2 2 2
303 2 2 2 2
403 2 2 2 2
403 2 2 2 2
403 2 2 2 2
4 3 3 3 3
4 3 3 3 3
4 3 3 3 3
104 3 3 3 3
104 3 3 3 3
104 3 3 3 3
204 3 3 3 3
204 3 3 3 3
204 3 3 3 3
304 3 3 3 3
304 3 3 3 3
304 3 3 3 3
404 3 3 3 3
404 3 3 3 3
404 3 3 3 3
SELECT FOUND_ROWS();
FOUND_ROWS()
1500
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1 JOIN tmp on t1.f2=tmp.f2
ORDER BY tmp.f1, f0 LIMIT 30 OFFSET 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2`,`tmp`.`f1` AS `f1`,`tmp`.`f2` AS `f2` from (`t1` join `tmp` on((`t1`.`f2` = `tmp`.`f2`))) order by `tmp`.`f1`,`t1`.`f0` limit 30,30"
},
{
"transformations_to_nested_joins": {
"transformations": [
"JOIN_condition_to_WHERE",
"parenthesis_removal"
],
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2`,`tmp`.`f1` AS `f1`,`tmp`.`f2` AS `f2` from `t1` join `tmp` where (`t1`.`f2` = `tmp`.`f2`) order by `tmp`.`f1`,`t1`.`f0` limit 30,30"
}
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f2` = `tmp`.`f2`)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f2` = `tmp`.`f2`)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
},
{
"table": "`tmp`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
},
{
"table": "`tmp`",
"table_scan": {
"rows": 300,
"cost": 3
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`tmp`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 300,
"access_type": "scan",
"resulting_rows": 300,
"cost": 63.465,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 300,
"cost_for_plan": 63.465,
"rest_of_plan": [
{
"plan_prefix": [
"`tmp`"
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"using_join_cache": true,
"buffers_needed": 1,
"resulting_rows": 500,
"cost": 30005,
"chosen": true
}
]
},
"condition_filtering_pct": 10,
"rows_for_plan": 15000,
"cost_for_plan": 30068,
"chosen": true
}
]
},
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"pruned_by_heuristic": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f2` = `tmp`.`f2`)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`tmp`",
"attached": null
},
{
"table": "`t1`",
"attached": "(`t1`.`f2` = `tmp`.`f2`)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`tmp`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`tmp`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": false,
"resulting_clause": "`tmp`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`tmp`"
},
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 235,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4462
}
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f1"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 60,
"rows_estimate": 1510,
"row_size": 17,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 61,
"examined_rows": 1500,
"number_of_tmp_files": 0,
"sort_buffer_size": 1528,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
SELECT FOUND_ROWS() {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select found_rows() AS `FOUND_ROWS()`"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
SELECT SQL_CALC_FOUND_ROWS * FROM t1 JOIN tmp on t1.f2=tmp.f2
WHERE t1.f2>20
ORDER BY tmp.f1, f0 LIMIT 30 OFFSET 30;
f0 f1 f2 f1 f2
24 23 23 23 23
24 23 23 23 23
24 23 23 23 23
124 23 23 23 23
124 23 23 23 23
124 23 23 23 23
224 23 23 23 23
224 23 23 23 23
224 23 23 23 23
324 23 23 23 23
324 23 23 23 23
324 23 23 23 23
424 23 23 23 23
424 23 23 23 23
424 23 23 23 23
25 24 24 24 24
25 24 24 24 24
25 24 24 24 24
125 24 24 24 24
125 24 24 24 24
125 24 24 24 24
225 24 24 24 24
225 24 24 24 24
225 24 24 24 24
325 24 24 24 24
325 24 24 24 24
325 24 24 24 24
425 24 24 24 24
425 24 24 24 24
425 24 24 24 24
SELECT FOUND_ROWS();
FOUND_ROWS()
1185
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1 JOIN tmp on t1.f2=tmp.f2
WHERE t1.f2>20
ORDER BY tmp.f1, f0 LIMIT 30 OFFSET 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2`,`tmp`.`f1` AS `f1`,`tmp`.`f2` AS `f2` from (`t1` join `tmp` on((`t1`.`f2` = `tmp`.`f2`))) where (`t1`.`f2` > 20) order by `tmp`.`f1`,`t1`.`f0` limit 30,30"
},
{
"transformations_to_nested_joins": {
"transformations": [
"JOIN_condition_to_WHERE",
"parenthesis_removal"
],
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2`,`tmp`.`f1` AS `f1`,`tmp`.`f2` AS `f2` from `t1` join `tmp` where ((`t1`.`f2` > 20) and (`t1`.`f2` = `tmp`.`f2`)) order by `tmp`.`f1`,`t1`.`f0` limit 30,30"
}
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "((`t1`.`f2` > 20) and (`t1`.`f2` = `tmp`.`f2`))",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "((`t1`.`f2` > 20) and (`t1`.`f2` = `tmp`.`f2`))"
},
{
"transformation": "constant_propagation",
"resulting_condition": "((`t1`.`f2` > 20) and (`t1`.`f2` = `tmp`.`f2`))"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "((`t1`.`f2` > 20) and (`t1`.`f2` = `tmp`.`f2`))"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
},
{
"table": "`tmp`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
},
{
"table": "`tmp`",
"table_scan": {
"rows": 300,
"cost": 3
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`tmp`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 300,
"access_type": "scan",
"resulting_rows": 300,
"cost": 63.465,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 300,
"cost_for_plan": 63.465,
"rest_of_plan": [
{
"plan_prefix": [
"`tmp`"
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"using_join_cache": true,
"buffers_needed": 1,
"resulting_rows": 166.65,
"cost": 10072,
"chosen": true
}
]
},
"condition_filtering_pct": 10,
"rows_for_plan": 4999.5,
"cost_for_plan": 10136,
"chosen": true
}
]
},
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 166.65,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 166.65,
"cost_for_plan": 104.44,
"rest_of_plan": [
{
"plan_prefix": [
"`t1`"
],
"table": "`tmp`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 300,
"access_type": "scan",
"using_join_cache": true,
"buffers_needed": 1,
"resulting_rows": 300,
"cost": 10003,
"chosen": true
}
]
},
"condition_filtering_pct": 10,
"rows_for_plan": 4999.5,
"cost_for_plan": 10107,
"chosen": true
}
]
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "((`t1`.`f2` > 20) and (`t1`.`f2` = `tmp`.`f2`))",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f2` > 20)"
},
{
"table": "`tmp`",
"attached": "(`t1`.`f2` = `tmp`.`f2`)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`tmp`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`tmp`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": false,
"resulting_clause": "`tmp`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
},
{
"table": "`tmp`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 235,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4462
}
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f1"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 60,
"rows_estimate": 1195,
"row_size": 17,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 61,
"examined_rows": 1185,
"number_of_tmp_files": 0,
"sort_buffer_size": 1528,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
SELECT FOUND_ROWS() {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select found_rows() AS `FOUND_ROWS()`"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
DROP TABLE tmp;
set optimizer_trace_limit=1;
set optimizer_trace_offset=-1;
CREATE VIEW v1 as SELECT * FROM t1 ORDER BY f1, f0 LIMIT 30;
SELECT * FROM v1;
f0 f1 f2
1 0 0
101 0 0
201 0 0
301 0 0
401 0 0
2 1 1
102 1 1
202 1 1
302 1 1
402 1 1
3 2 2
103 2 2
203 2 2
303 2 2
403 2 2
4 3 3
104 3 3
204 3 3
304 3 3
404 3 3
5 4 4
105 4 4
205 4 4
305 4 4
405 4 4
6 5 5
106 5 5
206 5 5
306 5 5
406 5 5
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM v1 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 30"
}
]
}
},
{
"view": {
"table": "`v1`",
"select#": 2,
"materialized": true
}
},
{
"expanded_query": "/* select#1 */ select `v1`.`f0` AS `f0`,`v1`.`f1` AS `f1`,`v1`.`f2` AS `f2` from `v1`"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"table_dependencies": [
{
"table": "`v1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`v1`",
"table_scan": {
"rows": 30,
"cost": 11
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`v1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 30,
"access_type": "scan",
"resulting_rows": 30,
"cost": 17.5,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 30,
"cost_for_plan": 17.5,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`v1`",
"attached": null
}
]
}
},
{
"refine_plan": [
{
"table": "`v1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "`v1`",
"row_length": 210,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4993
}
}
},
{
"join_execution": {
"select#": 2,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 510,
"row_size": 219,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 7040,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
}
}
]
} 0 0
drop view v1;
CREATE VIEW v1 as SELECT * FROM t1 ORDER BY f1, f0 LIMIT 100;
SELECT * FROM v1 ORDER BY f2, f0 LIMIT 30;
f0 f1 f2
1 0 0
101 0 0
201 0 0
301 0 0
401 0 0
2 1 1
102 1 1
202 1 1
302 1 1
402 1 1
11 10 10
111 10 10
211 10 10
311 10 10
411 10 10
12 11 11
112 11 11
212 11 11
312 11 11
412 11 11
13 12 12
113 12 12
213 12 12
313 12 12
413 12 12
14 13 13
114 13 13
214 13 13
314 13 13
414 13 13
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM v1 ORDER BY f2, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 100"
}
]
}
},
{
"view": {
"table": "`v1`",
"select#": 2,
"materialized": true
}
},
{
"expanded_query": "/* select#1 */ select `v1`.`f0` AS `f0`,`v1`.`f1` AS `f1`,`v1`.`f2` AS `f2` from `v1` order by `v1`.`f2`,`v1`.`f0` limit 30"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`v1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`v1`",
"table_scan": {
"rows": 100,
"cost": 15
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`v1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 35,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 35,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`v1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`v1`.`f2`,`v1`.`f0`",
"items": [
{
"item": "`v1`.`f2`"
},
{
"item": "`v1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`v1`.`f2`,`v1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`v1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "`v1`",
"row_length": 210,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4993
}
}
},
{
"join_execution": {
"select#": 2,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 100,
"rows_estimate": 510,
"row_size": 219,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 101,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 22928,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "`v1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`v1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 110,
"row_size": 213,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 6856,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
CREATE VIEW v2 as SELECT * FROM t1 ORDER BY f2, f0 LIMIT 100;
SELECT * FROM v1 JOIN v2 on v1.f1=v2.f1 ORDER BY v1.f2,v1.f0,v2.f0
LIMIT 30;
f0 f1 f2 f0 f1 f2
1 0 0 1 0 0
1 0 0 101 0 0
1 0 0 201 0 0
1 0 0 301 0 0
1 0 0 401 0 0
101 0 0 1 0 0
101 0 0 101 0 0
101 0 0 201 0 0
101 0 0 301 0 0
101 0 0 401 0 0
201 0 0 1 0 0
201 0 0 101 0 0
201 0 0 201 0 0
201 0 0 301 0 0
201 0 0 401 0 0
301 0 0 1 0 0
301 0 0 101 0 0
301 0 0 201 0 0
301 0 0 301 0 0
301 0 0 401 0 0
401 0 0 1 0 0
401 0 0 101 0 0
401 0 0 201 0 0
401 0 0 301 0 0
401 0 0 401 0 0
2 1 1 2 1 1
2 1 1 102 1 1
2 1 1 202 1 1
2 1 1 302 1 1
2 1 1 402 1 1
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM v1 JOIN v2 on v1.f1=v2.f1 ORDER BY v1.f2,v1.f0,v2.f0
LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 100"
}
]
}
},
{
"join_preparation": {
"select#": 3,
"steps": [
{
"expanded_query": "/* select#3 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f2`,`t1`.`f0` limit 100"
}
]
}
},
{
"view": {
"table": "`v1`",
"select#": 2,
"materialized": true
}
},
{
"view": {
"table": "`v2`",
"select#": 3,
"materialized": true
}
},
{
"expanded_query": "/* select#1 */ select `v1`.`f0` AS `f0`,`v1`.`f1` AS `f1`,`v1`.`f2` AS `f2`,`v2`.`f0` AS `f0`,`v2`.`f1` AS `f1`,`v2`.`f2` AS `f2` from (`v1` join `v2` on((`v1`.`f1` = `v2`.`f1`))) order by `v1`.`f2`,`v1`.`f0`,`v2`.`f0` limit 30"
},
{
"transformations_to_nested_joins": {
"transformations": [
"JOIN_condition_to_WHERE",
"parenthesis_removal"
],
"expanded_query": "/* select#1 */ select `v1`.`f0` AS `f0`,`v1`.`f1` AS `f1`,`v1`.`f2` AS `f2`,`v2`.`f0` AS `f0`,`v2`.`f1` AS `f1`,`v2`.`f2` AS `f2` from `v1` join `v2` where (`v1`.`f1` = `v2`.`f1`) order by `v1`.`f2`,`v1`.`f0`,`v2`.`f0` limit 30"
}
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_optimization": {
"select#": 3,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`v1`.`f1` = `v2`.`f1`)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "multiple equal(`v1`.`f1`, `v2`.`f1`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "multiple equal(`v1`.`f1`, `v2`.`f1`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "multiple equal(`v1`.`f1`, `v2`.`f1`)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`v1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
},
{
"table": "`v2`",
"row_may_be_null": false,
"map_bit": 1,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
{
"table": "`v1`",
"field": "f1",
"equals": "`v2`.`f1`",
"null_rejecting": true
},
{
"table": "`v1`",
"field": "f1",
"equals": "`v2`.`f1`",
"null_rejecting": true
},
{
"table": "`v2`",
"field": "f1",
"equals": "`v1`.`f1`",
"null_rejecting": true
},
{
"table": "`v2`",
"field": "f1",
"equals": "`v1`.`f1`",
"null_rejecting": true
}
]
},
{
"rows_estimation": [
{
"table": "`v1`",
"table_scan": {
"rows": 100,
"cost": 15
}
},
{
"table": "`v2`",
"table_scan": {
"rows": 100,
"cost": 15
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`v1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "<auto_key0>",
"usable": false,
"chosen": false
},
{
"access_type": "ref",
"index": "<auto_key1>",
"usable": false,
"chosen": false
},
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 35,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 35,
"rest_of_plan": [
{
"plan_prefix": [
"`v1`"
],
"table": "`v2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "<auto_key0>",
"rows": 10,
"cost": 1200,
"chosen": true
},
{
"access_type": "ref",
"index": "<auto_key1>",
"rows": 10,
"cost": 1200,
"chosen": false
},
{
"rows_to_scan": 100,
"access_type": "scan",
"using_join_cache": true,
"buffers_needed": 1,
"resulting_rows": 100,
"cost": 2016.2,
"chosen": false
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 1000,
"cost_for_plan": 1235,
"chosen": true
}
]
},
{
"plan_prefix": [
],
"table": "`v2`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "<auto_key0>",
"usable": false,
"chosen": false
},
{
"access_type": "ref",
"index": "<auto_key1>",
"usable": false,
"chosen": false
},
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 35,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 35,
"rest_of_plan": [
{
"plan_prefix": [
"`v2`"
],
"table": "`v1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "<auto_key0>",
"rows": 10,
"cost": 1200,
"chosen": true
},
{
"access_type": "ref",
"index": "<auto_key1>",
"rows": 10,
"cost": 1200,
"chosen": false
},
{
"rows_to_scan": 100,
"access_type": "scan",
"using_join_cache": true,
"buffers_needed": 1,
"resulting_rows": 100,
"cost": 2016.2,
"chosen": false
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 1000,
"cost_for_plan": 1235,
"pruned_by_cost": true
}
]
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`v2`.`f1` = `v1`.`f1`)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`v1`",
"attached": "(`v1`.`f1` is not null)"
},
{
"table": "`v2`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`v1`.`f2`,`v1`.`f0`,`v2`.`f0`",
"items": [
{
"item": "`v1`.`f2`"
},
{
"item": "`v1`.`f0`"
},
{
"item": "`v2`.`f0`"
}
],
"resulting_clause_is_simple": false,
"resulting_clause": "`v1`.`f2`,`v1`.`f0`,`v2`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`v1`"
},
{
"table": "`v2`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "`v1`",
"row_length": 210,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4993
}
}
},
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "`v2`",
"row_length": 210,
"key_length": 5,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4993
}
}
},
{
"join_execution": {
"select#": 2,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 100,
"rows_estimate": 510,
"row_size": 219,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 101,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 22928,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
},
{
"join_execution": {
"select#": 3,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 100,
"rows_estimate": 510,
"row_size": 415,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 101,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 42728,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
},
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 419,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 2502
}
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f2"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f0"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 335,
"row_size": 217,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 325,
"number_of_tmp_files": 0,
"sort_buffer_size": 6976,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
SELECT floor(f1/10) f3, count(f2) FROM t1
GROUP BY 1 ORDER BY 2,1 LIMIT 5;
f3 count(f2)
0 50
1 50
2 50
3 50
4 50
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT floor(f1/10) f3, count(f2) FROM t1
GROUP BY 1 ORDER BY 2,1 LIMIT 5 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select floor((`t1`.`f1` / 10)) AS `f3`,count(`t1`.`f2`) AS `count(f2)` from `t1` group by floor((`t1`.`f1` / 10)) order by count(`t1`.`f2`),floor((`t1`.`f1` / 10)) limit 5"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "count(`t1`.`f2`),floor((`t1`.`f1` / 10))",
"items": [
{
"item": "count(`t1`.`f2`)"
},
{
"item": "floor((`t1`.`f1` / 10))"
}
],
"resulting_clause_is_simple": false,
"resulting_clause": "count(`t1`.`f2`),floor((`t1`.`f1` / 10))"
}
},
{
"clause_processing": {
"clause": "GROUP BY",
"original_clause": "floor((`t1`.`f1` / 10))",
"items": [
{
"item": "floor((`t1`.`f1` / 10))"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "floor((`t1`.`f1` / 10))"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 18,
"key_length": 9,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 58254
}
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "count(f2)"
},
{
"direction": "asc",
"table": "intermediate_tmp_table",
"field": "f3"
}
],
"filesort_priority_queue_optimization": {
"limit": 5,
"rows_estimate": 20,
"row_size": 25,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 6,
"examined_rows": 10,
"number_of_tmp_files": 0,
"sort_buffer_size": 200,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
SELECT floor(f1/10) f3, count(f2) FROM t1
GROUP BY 1 ORDER BY 2,1 LIMIT 0;
f3 count(f2)
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT floor(f1/10) f3, count(f2) FROM t1
GROUP BY 1 ORDER BY 2,1 LIMIT 0 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select floor((`t1`.`f1` / 10)) AS `f3`,count(`t1`.`f2`) AS `count(f2)` from `t1` group by floor((`t1`.`f1` / 10)) order by count(`t1`.`f2`),floor((`t1`.`f1` / 10)) limit 0"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
],
"empty_result": {
"cause": "Zero limit"
}
}
},
{
"join_execution": {
"select#": 1,
"steps": [
]
}
}
]
} 0 0
CREATE PROCEDURE wl1393_sp_test()
BEGIN
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 30;
SELECT * FROM information_schema.OPTIMIZER_TRACE;
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 15 OFFSET 15;
SELECT * FROM information_schema.OPTIMIZER_TRACE;
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 15 OFFSET 15;
SELECT * FROM information_schema.OPTIMIZER_TRACE;
SELECT FOUND_ROWS();
SELECT * FROM v1 ORDER BY f2, f0 LIMIT 30;
SELECT * FROM information_schema.OPTIMIZER_TRACE;
END|
CALL wl1393_sp_test()|
f0 f1 f2
12 11 11
112 11 11
212 11 11
312 11 11
412 11 11
13 12 12
113 12 12
213 12 12
313 12 12
413 12 12
14 13 13
114 13 13
214 13 13
314 13 13
414 13 13
15 14 14
115 14 14
215 14 14
315 14 14
415 14 14
16 15 15
116 15 15
216 15 15
316 15 15
416 15 15
17 16 16
117 16 16
217 16 16
317 16 16
417 16 16
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 30"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 166.65,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 166.65,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 510,
"row_size": 415,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 13120,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
f0 f1 f2
15 14 14
115 14 14
215 14 14
315 14 14
415 14 14
16 15 15
116 15 15
216 15 15
316 15 15
416 15 15
17 16 16
117 16 16
217 16 16
317 16 16
417 16 16
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1>10 ORDER BY f2, f0 LIMIT 15 OFFSET 15 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 15,15"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 166.65,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 166.65,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 510,
"row_size": 415,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 13120,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
f0 f1 f2
15 14 14
115 14 14
215 14 14
315 14 14
415 14 14
16 15 15
116 15 15
216 15 15
316 15 15
416 15 15
17 16 16
117 16 16
217 16 16
317 16 16
417 16 16
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT SQL_CALC_FOUND_ROWS * FROM t1 WHERE f1>10
ORDER BY f2, f0 LIMIT 15 OFFSET 15 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select sql_calc_found_rows `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` > 10) order by `t1`.`f2`,`t1`.`f0` limit 15,15"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` > 10)",
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "(`t1`.`f1` > 10)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "(`t1`.`f1` > 10)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 166.65,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 166.65,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` > 10)",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` > 10)"
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f2`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 510,
"row_size": 415,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 13120,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
} 0 0
FOUND_ROWS()
1
f0 f1 f2
1 0 0
101 0 0
201 0 0
301 0 0
401 0 0
2 1 1
102 1 1
202 1 1
302 1 1
402 1 1
11 10 10
111 10 10
211 10 10
311 10 10
411 10 10
12 11 11
112 11 11
212 11 11
312 11 11
412 11 11
13 12 12
113 12 12
213 12 12
313 12 12
413 12 12
14 13 13
114 13 13
214 13 13
314 13 13
414 13 13
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM v1 ORDER BY f2, f0 LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1`,`t1`.`f0` limit 100"
}
]
}
},
{
"view": {
"table": "`v1`",
"select#": 2,
"materialized": true
}
},
{
"expanded_query": "/* select#1 */ select `v1`.`f0` AS `f0`,`v1`.`f1` AS `f1`,`v1`.`f2` AS `f2` from `v1` order by `v1`.`f2`,`v1`.`f0` limit 30"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`,`t1`.`f0`",
"items": [
{
"item": "`t1`.`f1`"
},
{
"item": "`t1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`,`t1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`v1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`v1`",
"table_scan": {
"rows": 100,
"cost": 15
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`v1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 100,
"access_type": "scan",
"resulting_rows": 100,
"cost": 35,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 100,
"cost_for_plan": 35,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`v1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`v1`.`f2`,`v1`.`f0`",
"items": [
{
"item": "`v1`.`f2`"
},
{
"item": "`v1`.`f0`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`v1`.`f2`,`v1`.`f0`"
}
},
{
"refine_plan": [
{
"table": "`v1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "`v1`",
"row_length": 210,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4993
}
}
},
{
"join_execution": {
"select#": 2,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
},
{
"direction": "asc",
"table": "`t1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 100,
"rows_estimate": 510,
"row_size": 219,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 101,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 22928,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
},
{
"filesort_information": [
{
"direction": "asc",
"table": "`v1`",
"field": "f2"
},
{
"direction": "asc",
"table": "`v1`",
"field": "f0"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 110,
"row_size": 213,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 100,
"number_of_tmp_files": 0,
"sort_buffer_size": 6856,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
DROP PROCEDURE wl1393_sp_test|
SELECT d1.f1, d1.f2 FROM t1
LEFT JOIN (SELECT * FROM t1 ORDER BY f1 LIMIT 30) d1 on t1.f1=d1.f1
ORDER BY d1.f2 DESC LIMIT 30;
f1 f2
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
5 5
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5 5
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4 4
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SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT d1.f1, d1.f2 FROM t1
LEFT JOIN (SELECT * FROM t1 ORDER BY f1 LIMIT 30) d1 on t1.f1=d1.f1
ORDER BY d1.f2 DESC LIMIT 30 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1` limit 30"
}
]
}
},
{
"derived": {
"table": " `d1`",
"select#": 2,
"materialized": true
}
},
{
"expanded_query": "/* select#1 */ select `d1`.`f1` AS `f1`,`d1`.`f2` AS `f2` from (`t1` left join (/* select#2 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1` limit 30) `d1` on((`t1`.`f1` = `d1`.`f1`))) order by `d1`.`f2` desc limit 30"
},
{
"transformations_to_nested_joins": {
"transformations": [
"parenthesis_removal"
],
"expanded_query": "/* select#1 */ select `d1`.`f1` AS `f1`,`d1`.`f2` AS `f2` from `t1` left join (/* select#2 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f1` limit 30) `d1` on((`t1`.`f1` = `d1`.`f1`)) order by `d1`.`f2` desc limit 30"
}
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"join_optimization": {
"select#": 2,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`",
"items": [
{
"item": "`t1`.`f1`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"condition_processing": {
"condition": "WHERE",
"original_condition": null,
"steps": [
{
"transformation": "equality_propagation",
"resulting_condition": null
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
},
{
"table": " `d1`",
"row_may_be_null": true,
"map_bit": 1,
"depends_on_map_bits": [
0
]
}
]
},
{
"ref_optimizer_key_uses": [
{
"table": " `d1`",
"field": "f1",
"equals": "`t1`.`f1`",
"null_rejecting": true
},
{
"table": " `d1`",
"field": "f1",
"equals": "`t1`.`f1`",
"null_rejecting": true
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
},
{
"table": " `d1`",
"table_scan": {
"rows": 30,
"cost": 11
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"rest_of_plan": [
{
"plan_prefix": [
"`t1`"
],
"table": " `d1`",
"best_access_path": {
"considered_access_paths": [
{
"access_type": "ref",
"index": "<auto_key0>",
"rows": 3,
"cost": 1800,
"chosen": true
},
{
"access_type": "ref",
"index": "<auto_key1>",
"rows": 3,
"cost": 1800,
"chosen": false
},
{
"rows_to_scan": 30,
"access_type": "scan",
"using_join_cache": true,
"buffers_needed": 1,
"resulting_rows": 30,
"cost": 3011.6,
"chosen": false
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 1500,
"cost_for_plan": 1904.4,
"sort_cost": 1500,
"new_cost_for_plan": 3404.4,
"chosen": true
}
]
}
]
},
{
"condition_on_constant_tables": "1",
"condition_value": true
},
{
"attaching_conditions_to_tables": {
"original_condition": "1",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
},
{
"table": " `d1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`d1`.`f2` desc",
"items": [
{
"item": "`d1`.`f2`"
}
],
"resulting_clause_is_simple": false,
"resulting_clause": "`d1`.`f2` desc"
}
},
{
"refine_plan": [
{
"table": "`t1`"
},
{
"table": " `d1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"creating_tmp_table": {
"tmp_table_info": {
"table": " `d1`",
"row_length": 210,
"key_length": 5,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 4993
}
}
},
{
"join_execution": {
"select#": 2,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 510,
"row_size": 215,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 6920,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
},
{
"creating_tmp_table": {
"tmp_table_info": {
"table": "intermediate_tmp_table",
"row_length": 206,
"key_length": 0,
"unique_constraint": false,
"location": "memory (heap)",
"row_limit_estimate": 5090
}
}
},
{
"filesort_information": [
{
"direction": "desc",
"table": "intermediate_tmp_table",
"field": "f2"
}
],
"filesort_priority_queue_optimization": {
"limit": 30,
"rows_estimate": 630,
"row_size": 209,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 31,
"examined_rows": 620,
"number_of_tmp_files": 0,
"sort_buffer_size": 6728,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1 = (SELECT f1 FROM t1 ORDER BY 1 LIMIT 1);
f0 f1 f2
1 0 0
101 0 0
201 0 0
301 0 0
401 0 0
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1 = (SELECT f1 FROM t1 ORDER BY 1 LIMIT 1) {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 1"
}
]
}
},
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` = (/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 1))"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` = (/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 1))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
],
"resulting_condition": "multiple equal((/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 1), `t1`.`f1`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "multiple equal((/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 1), `t1`.`f1`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "multiple equal((/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 1), `t1`.`f1`)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` = (/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 1))",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` = (/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 1))"
}
]
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_optimization": {
"select#": 2,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`",
"items": [
{
"item": "`t1`.`f1`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_execution": {
"select#": 2,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
}
],
"filesort_priority_queue_optimization": {
"limit": 1,
"rows_estimate": 510,
"row_size": 10,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 2,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 40,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
]
}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
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}
},
{
"subselect_execution": {
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"steps": [
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}
},
{
"subselect_execution": {
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"steps": [
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}
},
{
"subselect_execution": {
"select#": 2,
"steps": [
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}
},
{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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"steps": [
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}
},
{
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}
},
{
"subselect_execution": {
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"steps": [
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}
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{
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"steps": [
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}
},
{
"subselect_execution": {
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}
},
{
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}
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{
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}
},
{
"subselect_execution": {
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}
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{
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}
},
{
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}
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{
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}
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{
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{
"subselect_execution": {
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}
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{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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}
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{
"subselect_execution": {
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},
{
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{
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{
"subselect_execution": {
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{
"subselect_execution": {
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{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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"steps": [
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}
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{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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"steps": [
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}
},
{
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"steps": [
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}
},
{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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"steps": [
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}
},
{
"subselect_execution": {
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"steps": [
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}
},
{
"subselect_execution": {
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},
{
"subselect_execution": {
"select#": 2,
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}
},
{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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},
{
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{
"subselect_execution": {
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{
"subselect_execution": {
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}
},
{
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{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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},
{
"subselect_execution": {
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{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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},
{
"subselect_execution": {
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}
},
{
"subselect_execution": {
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},
{
"subselect_execution": {
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}
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{
"subselect_execution": {
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}
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{
"subselect_execution": {
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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}
},
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{
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{
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{
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},
{
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},
{
"subselect_execution": {
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},
{
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}
}
]
}
}
]
} 0 0
SELECT * FROM t1 WHERE f1 = (SELECT f1 FROM t1 ORDER BY 1 LIMIT 2);
ERROR 21000: Subquery returns more than 1 row
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 WHERE f1 = (SELECT f1 FROM t1 ORDER BY 1 LIMIT 2) {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"join_preparation": {
"select#": 2,
"steps": [
{
"expanded_query": "/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 2"
}
]
}
},
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` where (`t1`.`f1` = (/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 2))"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"condition_processing": {
"condition": "WHERE",
"original_condition": "(`t1`.`f1` = (/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 2))",
"steps": [
{
"transformation": "equality_propagation",
"subselect_evaluation": [
],
"resulting_condition": "multiple equal((/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 2), `t1`.`f1`)"
},
{
"transformation": "constant_propagation",
"resulting_condition": "multiple equal((/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 2), `t1`.`f1`)"
},
{
"transformation": "trivial_condition_removal",
"resulting_condition": "multiple equal((/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 2), `t1`.`f1`)"
}
]
}
},
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"ref_optimizer_key_uses": [
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": "(`t1`.`f1` = (/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 2))",
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": "(`t1`.`f1` = (/* select#2 */ select `t1`.`f1` from `t1` order by `t1`.`f1` limit 2))"
}
]
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_optimization": {
"select#": 2,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 500,
"cost": 4
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 500,
"access_type": "scan",
"resulting_rows": 500,
"cost": 104.44,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 500,
"cost_for_plan": 104.44,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f1`",
"items": [
{
"item": "`t1`.`f1`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f1`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"subselect_execution": {
"select#": 2,
"steps": [
{
"join_execution": {
"select#": 2,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f1"
}
],
"filesort_priority_queue_optimization": {
"limit": 2,
"rows_estimate": 510,
"row_size": 10,
"memory_available": 327680,
"chosen": true
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 3,
"examined_rows": 500,
"number_of_tmp_files": 0,
"sort_buffer_size": 56,
"sort_mode": "<sort_key, additional_fields>"
}
}
]
}
}
]
}
}
]
}
}
]
} 0 0
CREATE TEMPORARY TABLE tmp (f1 int, f2 varchar(20));
INSERT INTO tmp SELECT f1,f2 FROM t1;
INSERT INTO t1(f1,f2) SELECT * FROM tmp;
INSERT INTO tmp SELECT f1,f2 FROM t1;
INSERT INTO t1(f1,f2) SELECT * FROM tmp;
INSERT INTO t1(f1,f2) SELECT * FROM tmp;
INSERT INTO tmp SELECT f1,f2 FROM t1;
INSERT INTO t1(f1,f2) SELECT * FROM tmp;
INSERT INTO tmp SELECT f1,f2 FROM t1;
INSERT INTO t1(f1,f2) SELECT * FROM tmp;
INSERT INTO tmp SELECT f1,f2 FROM t1;
INSERT INTO t1(f1,f2) SELECT * FROM tmp;
INSERT INTO tmp SELECT f1,f2 FROM t1;
INSERT INTO t1(f1,f2) SELECT * FROM tmp;
INSERT INTO tmp SELECT f1,f2 FROM t1;
INSERT INTO t1(f1,f2) SELECT * FROM tmp;
set sort_buffer_size= 32768;
SELECT * FROM t1 ORDER BY f2 LIMIT 100;
f0 f1 f2
1 0 0
101 0 0
201 0 0
301 0 0
401 0 0
501 0 0
601 0 0
701 0 0
801 0 0
901 0 0
1001 0 0
1101 0 0
1201 0 0
1301 0 0
1401 0 0
1501 0 0
1601 0 0
1701 0 0
1801 0 0
1901 0 0
2001 0 0
2101 0 0
2201 0 0
2301 0 0
2401 0 0
2501 0 0
2601 0 0
2701 0 0
2801 0 0
2901 0 0
3001 0 0
3101 0 0
3201 0 0
3301 0 0
3401 0 0
3501 0 0
3601 0 0
3701 0 0
3801 0 0
3901 0 0
4001 0 0
4101 0 0
4201 0 0
4301 0 0
4401 0 0
4501 0 0
4601 0 0
4701 0 0
4801 0 0
4901 0 0
5001 0 0
5101 0 0
5201 0 0
5301 0 0
5401 0 0
5501 0 0
5601 0 0
5701 0 0
5801 0 0
5901 0 0
6001 0 0
6101 0 0
6201 0 0
6301 0 0
6401 0 0
6501 0 0
6601 0 0
6701 0 0
6801 0 0
6901 0 0
7001 0 0
7101 0 0
7201 0 0
7301 0 0
7401 0 0
7501 0 0
7601 0 0
7701 0 0
7801 0 0
7901 0 0
8001 0 0
8101 0 0
8201 0 0
8301 0 0
8401 0 0
8501 0 0
8601 0 0
8701 0 0
8801 0 0
8901 0 0
9001 0 0
9101 0 0
9201 0 0
9301 0 0
9401 0 0
9501 0 0
9601 0 0
9701 0 0
9801 0 0
9901 0 0
SELECT * FROM information_schema.OPTIMIZER_TRACE;
QUERY TRACE MISSING_BYTES_BEYOND_MAX_MEM_SIZE INSUFFICIENT_PRIVILEGES
SELECT * FROM t1 ORDER BY f2 LIMIT 100 {
"steps": [
{
"join_preparation": {
"select#": 1,
"steps": [
{
"expanded_query": "/* select#1 */ select `t1`.`f0` AS `f0`,`t1`.`f1` AS `f1`,`t1`.`f2` AS `f2` from `t1` order by `t1`.`f2` limit 100"
}
]
}
},
{
"join_optimization": {
"select#": 1,
"steps": [
{
"substitute_generated_columns": {
}
},
{
"table_dependencies": [
{
"table": "`t1`",
"row_may_be_null": false,
"map_bit": 0,
"depends_on_map_bits": [
]
}
]
},
{
"rows_estimation": [
{
"table": "`t1`",
"table_scan": {
"rows": 438500,
"cost": 2143
}
}
]
},
{
"considered_execution_plans": [
{
"plan_prefix": [
],
"table": "`t1`",
"best_access_path": {
"considered_access_paths": [
{
"rows_to_scan": 438500,
"access_type": "scan",
"resulting_rows": 438500,
"cost": 89843,
"chosen": true
}
]
},
"condition_filtering_pct": 100,
"rows_for_plan": 438500,
"cost_for_plan": 89843,
"chosen": true
}
]
},
{
"attaching_conditions_to_tables": {
"original_condition": null,
"attached_conditions_computation": [
],
"attached_conditions_summary": [
{
"table": "`t1`",
"attached": null
}
]
}
},
{
"clause_processing": {
"clause": "ORDER BY",
"original_clause": "`t1`.`f2`",
"items": [
{
"item": "`t1`.`f2`"
}
],
"resulting_clause_is_simple": true,
"resulting_clause": "`t1`.`f2`"
}
},
{
"refine_plan": [
{
"table": "`t1`"
}
]
}
]
}
},
{
"join_execution": {
"select#": 1,
"steps": [
{
"filesort_information": [
{
"direction": "asc",
"table": "`t1`",
"field": "f2"
}
],
"filesort_priority_queue_optimization": {
"limit": 100,
"rows_estimate": 438510,
"row_size": 411,
"memory_available": 32768,
"strip_additional_fields": {
"row_size": 215,
"sort_merge_cost": 909261,
"priority_queue_cost": 714335,
"chosen": true
}
},
"filesort_execution": [
],
"filesort_summary": {
"rows": 101,
"examined_rows": 438500,
"number_of_tmp_files": 0,
"sort_buffer_size": 21720,
"sort_mode": "<sort_key, rowid>"
}
}
]
}
}
]
} 0 0
DROP TABLE t1, tmp;
DROP VIEW v1, v2;
# end of WL#1393 - Optimizing filesort with small limit
# end of WL#5834 - Add optimizer traces for sorting