config root man

--source include/have_optimizer_trace.inc
--source include/have_64bit.inc

if (`SELECT $PS_PROTOCOL + $SP_PROTOCOL + $CURSOR_PROTOCOL
            + $VIEW_PROTOCOL > 0`)
{
   --skip Need normal protocol
}

SET optimizer_trace_max_mem_size=1048576; # 1MB
SET optimizer_trace="enabled=on,one_line=off";
SET end_markers_in_json="on";

CREATE TABLE tmp (
  pk INT PRIMARY KEY AUTO_INCREMENT,
  col1 CHAR (1)
);

INSERT INTO tmp(col1) VALUES ('a'),('b'),('c'),('d'),('e'),('f'),('g'),('h');

CREATE TABLE t1 (
  uniq VARCHAR(10),
  col1 VARCHAR(10),
  col2 VARCHAR(1024)
);

INSERT INTO t1 SELECT pk, col1, col1 FROM tmp;

--source include/turn_off_only_full_group_by.inc

# Uses MyISAM temporary table due to long VARCHAR in GROUP BY clause. 
SELECT uniq, col1 FROM t1 GROUP BY col2,uniq LIMIT 3;
--replace_result InnoDB TMP_TABLE_ENGINE MyISAM TMP_TABLE_ENGINE 
SELECT * FROM information_schema.OPTIMIZER_TRACE;

# Uses HEAP temporary table
SELECT uniq, col1, col2 FROM t1 GROUP BY uniq ;   
--replace_result InnoDB TMP_TABLE_ENGINE MyISAM TMP_TABLE_ENGINE 
SELECT * FROM information_schema.OPTIMIZER_TRACE;

select @@tmp_table_size;
SET @old_size= @@tmp_table_size;
SET SESSION tmp_table_size= 1024;

INSERT INTO t1 SELECT pk+8, col1, col1 FROM tmp;

# Uses HEAP temporary table. Converts it to MyISAM due to heap size limitation
SELECT uniq, col1, col2 FROM t1 GROUP BY uniq;   
--replace_result InnoDB TMP_TABLE_ENGINE MyISAM TMP_TABLE_ENGINE 
SELECT * FROM information_schema.OPTIMIZER_TRACE;

SET GLOBAL tmp_table_size= @old_size;

# Temp tables for I_S tables. Uses HEAP temporary table. 
# Converts it to MyISAM packed record format due to heap size limitation
SELECT pool_id FROM information_schema.innodb_buffer_page LIMIT 1;
--replace_result InnoDB TMP_TABLE_ENGINE MyISAM TMP_TABLE_ENGINE 
SELECT * FROM information_schema.OPTIMIZER_TRACE;

--source include/restore_sql_mode_after_turn_off_only_full_group_by.inc
DROP TABLE t1, tmp;

--echo #
--echo # Bug#17231940: THE OPTIMIZER STILL USES FIXED LENGTH TEMPORARY TABLES
--echo #               ON DISK
--echo #
CREATE TABLE t1 (
  c1 INT AUTO_INCREMENT PRIMARY KEY,
  c2 VARCHAR(250)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO t1(c2) VALUES ('b'),('b');
INSERT INTO t1(c2) SELECT t1.c2 FROM t1, t1 t2, t1 t3, t1 t4, t1 t5, t1 t6;

SET @@max_heap_table_size=1;
SET @@group_concat_max_len= 500;

# This query creates 4 tmp tables, 3 of them aren''t packed without this
# fix. 
# Purpose        Format without fix / with fix
# union result               fixed      packed
# derived tbl result         fixed      packed
# join materialization       fixed      packed
# group_concat internal tbl  packed     packed (not shown in the opt trace)
SELECT c1,GROUP_CONCAT(c2) cc FROM
  (SELECT * FROM t1 UNION SELECT c1, 'a' FROM t1) tt
  GROUP BY c1
  ORDER BY cc;
--replace_result InnoDB TMP_TABLE_ENGINE MyISAM TMP_TABLE_ENGINE 
SELECT * FROM information_schema.OPTIMIZER_TRACE;
DROP TABLE t1;
--echo #