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################################################################################ # inc/gcol_column_def_options.inc # # # # Purpose: # # Testing different optional parameters specified when defining # # a generated column. # # # # # #------------------------------------------------------------------------------# # Original Author: Andrey Zhakov # # Original Date: 2008-09-02 # # Change Author: # # Change Date: # # Change: # ################################################################################ --echo # --echo # Section 1. Wrong column definition options --echo # - DEFAULT <value> --echo # - AUTO_INCREMENT --echo # NOT NULL create table t1 (a int, b int generated always as (a+1) virtual not null); --error 1048 insert into t1(a) values(null); insert into t1(a) values(1); select * from t1; drop table t1; create table t1 (a int, b int generated always as (a+1) stored not null); --error 1048 insert into t1(a) values(null); insert into t1(a) values(1); select * from t1; drop table t1; create table t1 (a int); alter table t1 add column b int generated always as (a+1) virtual not null; drop table t1; --echo # NULL create table t1 (a int, b int generated always as (a+1) virtual null); drop table t1; create table t1 (a int); alter table t1 add column b int generated always as (a+1) virtual null; drop table t1; --echo # Added columns mixed with virtual GC and other columns create table t1 (a int); insert into t1 values(1); --enable_info alter table t1 add column (b int generated always as (a+1) virtual, c int); alter table t1 add column (d int, e int generated always as (a+1) virtual); alter table t1 add column (f int generated always as (a+1) virtual, g int as(5) stored); alter table t1 add column (h int generated always as (a+1) virtual, i int as(5) virtual); --disable_info drop table t1; --echo # DEFAULT --error 1064 create table t1 (a int, b int generated always as (a+1) virtual default 0); create table t1 (a int); --error 1064 alter table t1 add column b int generated always as (a+1) virtual default 0; drop table t1; --echo # AUTO_INCREMENT --error 1064 create table t1 (a int, b int generated always as (a+1) virtual AUTO_INCREMENT); create table t1 (a int); --error 1064 alter table t1 add column b int generated always as (a+1) virtual AUTO_INCREMENT; drop table t1; --echo # [PRIMARY] KEY if ($support_virtual_index) { --error ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN create table t1 (a int, b int generated always as (a+1) virtual key); } create table t1 (a int, b int generated always as (a+1) stored key); insert into t1 (a) values (3),(1),(2); --sorted_result select * from t1; drop table t1; if ($support_virtual_index) { --error ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN create table t1 (a int, b int generated always as (a+1) virtual primary key); } create table t1 (a int, b int generated always as (a+1) stored primary key); insert into t1 (a) values (3),(1),(2); select * from t1 order by b; drop table t1; create table t1 (a int); if ($support_virtual_index) { --error ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN alter table t1 add column b int generated always as (a+1) virtual key; } alter table t1 add column b int generated always as (a+1) stored key; if ($support_virtual_index) { --error ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN alter table t1 add column c int generated always as (a+2) virtual primary key; } show create table t1; --error 1068 alter table t1 add column c int generated always as (a+2) stored primary key; drop table t1; --echo # Section 2. Other column definition options --echo # - COMMENT --echo # - REFERENCES (only syntax testing here) --echo # - STORED (only systax testing here) create table t1 (a int, b int generated always as (a % 2) virtual comment 'my comment'); show create table t1; describe t1; drop table t1; create table t1 (a int, b int generated always as (a % 2) virtual); alter table t1 modify b int generated always as (a % 2) virtual comment 'my comment'; show create table t1; describe t1; insert into t1 (a) values (1); select * from t1; insert into t1 values (2,default); select a,b from t1 order by a; create table t2 like t1; show create table t2; describe t2; insert into t2 (a) values (1); select * from t2; insert into t2 values (2,default); select a,b from t2 order by a; drop table t2; drop table t1; create table t1 (a int, b int generated always as (a % 2) stored); show create table t1; describe t1; insert into t1 (a) values (1); select * from t1; insert into t1 values (2,default); select a,b from t1 order by a; drop table t1; create table t2 (a int); create table t1 (a int, b int generated always as (a % 2) stored references t2(a)); show create table t1; drop table t1; create table t1 (a int, b int generated always as (a % 2) virtual); --error 1064 alter table t1 modify b int generated always as (a % 2) stored references t2(a); show create table t1; drop table t1; drop table t2; --echo FK options create table t1(a int, b int as (a % 2), c int as (a) stored); create table t2 (a int); --error ER_KEY_COLUMN_DOES_NOT_EXITS alter table t1 add constraint foreign key fk(d) references t2(a); if ($support_virtual_index) { --error ER_CANNOT_ADD_FOREIGN alter table t1 add constraint foreign key fk(b) references t2(a); } --error ER_WRONG_FK_OPTION_FOR_GENERATED_COLUMN alter table t1 add constraint foreign key fk(c) references t2(a) on delete set null; --error ER_WRONG_FK_OPTION_FOR_GENERATED_COLUMN alter table t1 add constraint foreign key fk(c) references t2(a) on update set null; --error ER_WRONG_FK_OPTION_FOR_GENERATED_COLUMN alter table t1 add constraint foreign key fk(c) references t2(a) on update cascade; drop table t1; drop table t2; --echo Generated alwasy is optional create table t1 (a int, b int as (a % 2) virtual); show create table t1; describe t1; drop table t1; create table t1 (a int, b int as (a % 2) stored); show create table t1; describe t1; drop table t1; --echo Default should be non-stored column create table t1 (a int, b int as (a % 2)); show create table t1; describe t1; drop table t1; --echo Expression can be constant create table t1 (a int, b int as (5 * 2)); show create table t1; describe t1; drop table t1; --echo Test generated columns referencing other generated columns create table t1 (a int unique, b int generated always as(-a) virtual, c int generated always as (b + 1) virtual); insert into t1 (a) values (1), (2); --sorted_result select * from t1; insert into t1(a) values (1) on duplicate key update a=3; --sorted_result select * from t1; update t1 set a=4 where a=2; --sorted_result select * from t1; drop table t1; --error ER_GENERATED_COLUMN_NON_PRIOR create table t1 (a int, b int generated always as(-b) virtual, c int generated always as (b + 1) virtual); --error ER_GENERATED_COLUMN_NON_PRIOR create table t1 (a int, b int generated always as(-c) virtual, c int generated always as (b + 1) virtual); --error ER_GENERATED_COLUMN_REF_AUTO_INC CREATE TABLE t1 (pk INTEGER AUTO_INCREMENT, col_int_nokey INTEGER GENERATED ALWAYS AS (pk + col_int_key) STORED, col_int_key INTEGER, PRIMARY KEY (pk)); --echo # Bug#20339347: FAIL TO USE CREATE ....SELECT STATEMENT TO CREATE A NEW TABLE create table t1 (a int, b int generated always as(-a) virtual, c int generated always as (b + 1) stored); insert into t1(a) values(1),(2); create table tt as select * from t1; select * from t1 order by a; select * from tt order by a; drop table t1,tt; if (!$support_virtual_index) { --echo # Bug#20769299: INCORRECT KEY ERROR WHEN TRYING TO CREATE INDEX ON --echo # VIRTUAL GC FOR MYISAM --error ER_ILLEGAL_HA_CREATE_OPTION CREATE TABLE A ( pk INTEGER AUTO_INCREMENT, col_int_nokey INTEGER, col_int_key INTEGER GENERATED ALWAYS AS (pk + col_int_nokey) VIRTUAL, KEY (col_int_key)); } --echo # Bug#20745142: GENERATED COLUMNS: ASSERTION FAILED: --echo # THD->CHANGE_LIST.IS_EMPTY() --echo # --error ER_GENERATED_COLUMN_NON_PRIOR CREATE TABLE t1(a bigint AS (a between 1 and 1)); --echo # Bug#20757211: GENERATED COLUMNS: ALTER TABLE CRASHES --echo # IN FIND_FIELD_IN_TABLE --echo # CREATE TABLE t1(a int); --error 1064 ALTER TABLE t1 ADD COLUMN z int GENERATED ALWAYS AS ( 1 NOT IN (SELECT 1 FROM t1 WHERE c0006) ) virtual; DROP TABLE t1; --echo # Bug#20566243: ERROR WHILE DOING CREATE TABLE T1 SELECT (QUERY ON GC COLUMNS) CREATE TABLE t1(a int, b int as (a + 1), c varchar(12) as ("aaaabb") stored, d blob as (c)); INSERT INTO t1(a) VALUES(1),(3); SHOW CREATE TABLE t1; SELECT * FROM t1 order by a; CREATE TABLE t2 LIKE t1; SHOW CREATE TABLE t2; CREATE TABLE t3 AS SELECT * FROM t1; SHOW CREATE TABLE t3; SELECT * FROM t3 order by a; CREATE TABLE t4 AS SELECT b,c,d FROM t1; SHOW CREATE TABLE t4; SELECT * FROM t4 order by b; DROP TABLE t1,t2,t3,t4; --echo # Bug#21025003:WL8149:ASSERTION `CTX->NUM_TO_DROP_FK --echo # == HA_ALTER_INFO->ALTER_INFO-> FAILED --echo # CREATE TABLE t1 ( col1 int(11) DEFAULT NULL, col2 int(11) DEFAULT NULL, col3 int(11) DEFAULT NULL, col4 int(11) DEFAULT NULL, col5 int(11) GENERATED ALWAYS AS (col4 / col2) VIRTUAL, col6 text ); INSERT INTO t1(col1,col2,col3,col4,col6) VALUES(NULL,1,4,0,REPEAT(2,1000)); --error ER_CANT_DROP_FIELD_OR_KEY ALTER TABLE t1 DROP PRIMARY KEY , ADD KEY idx ( col5, col2 ); DROP TABLE t1; --echo # Bug#20949226:i CAN ASSIGN NON-DEFAULT() VALUE TO GENERATED COLUMN --echo # --error ER_NON_DEFAULT_VALUE_FOR_GENERATED_COLUMN CREATE TABLE t1 (c1 INT, c2 INT AS (c1 * 2)) SELECT 1 AS c1, 5 AS c2; CREATE TABLE t2 (a int); INSERT INTO t2 values(1); --error ER_NON_DEFAULT_VALUE_FOR_GENERATED_COLUMN CREATE TABLE t1 (c1 INT, c2 INT AS (c1 * 2)) SELECT 1 AS c1, a AS c2 from t2; CREATE TABLE t1 (c1 INT, c2 INT AS (c1 * 2)) SELECT 1 AS c1, 5; SELECT * FROM t1; DROP TABLE t1, t2; if ($support_virtual_index) { --echo # Bug#21074624:i WL8149:SIG 11 INNOBASE_GET_COMPUTED_VALUE | --echo # INNOBASE/HANDLER/HA_INNODB.CC:19082 CREATE TABLE t1 ( col1 int(11) NOT NULL, col2 int(11) DEFAULT NULL, col3 int(11) NOT NULL, col4 int(11) DEFAULT NULL, col5 int(11) GENERATED ALWAYS AS (col2 % col4) VIRTUAL, col6 int(11) GENERATED ALWAYS AS (col3 + col3) VIRTUAL, col7 int(11) GENERATED ALWAYS AS (col5 / col5) VIRTUAL, col8 int(11) GENERATED ALWAYS AS (col6 / col5) VIRTUAL, col9 text, extra int(11) DEFAULT NULL, KEY idx (col5) ); INSERT INTO t1(col1,col2,col3,col4,col9,extra) VALUES(0,6,3,4,REPEAT(4,1000),0); ALTER TABLE t1 DROP COLUMN col1; DROP TABLE t1; --echo # Bug#21390605:VALGRIND ERROR ON DELETE FROM TABLE CONTAINING --echo # AN INDEXED VIRTUAL COLUMN CREATE TABLE t1 ( a INTEGER, b INTEGER GENERATED ALWAYS AS (a) VIRTUAL, c INTEGER GENERATED ALWAYS AS (b) VIRTUAL, INDEX idx (b,c) ); INSERT INTO t1 (a) VALUES (42); DELETE FROM t1 WHERE c = 42; DROP TABLE t1; } --echo # Bug#20757211: GENERATED COLUMNS: ALTER TABLE CRASHES --echo # IN FIND_FIELD_IN_TABLE --echo # CREATE TABLE t1(a int); --error 1064 ALTER TABLE t1 ADD COLUMN z int GENERATED ALWAYS AS ( 1 NOT IN (SELECT 1 FROM t1 WHERE c0006) ) virtual; --error 1064 CREATE TABLE t2(a int, b int as (1 NOT IN (SELECT 1 FROM t1 WHERE not_exist_col))); --error 1064 CREATE TABLE t2(a int, b int as (1 NOT IN (SELECT 1 FROM dual))); DROP TABLE t1; if(! $testing_ndb) { --echo # Bug#21142905: PARTITIONED GENERATED COLS - --echo # !TABLE || (!TABLE->WRITE_SET || BITMAP_IS_SET --echo # CREATE TABLE t1 ( a int, b int generated always as (a) virtual, c int generated always as (b+a) virtual, d int generated always as (b+a) virtual ) PARTITION BY LINEAR HASH (b); INSERT INTO t1(a) VALUES(0); DELETE FROM t1 WHERE c=1; DROP TABLE t1; } --echo # Bug #20709487: COLLATE OPTION NOT ACCEPTED IN GENERATED COLUMN --echo # DEFINITION --echo # --echo # Check for a valid syntax: CREATE TABLE t1 (c CHAR(10) CHARACTER SET utf8 COLLATE utf8_bin GENERATED ALWAYS AS ("foo bar")); SHOW CREATE TABLE t1; DROP TABLE t1; CREATE TABLE t1 (i INT); ALTER TABLE t1 ADD COLUMN c CHAR(10) CHARACTER SET utf8 COLLATE utf8_bin GENERATED ALWAYS AS ("foo bar"); SHOW CREATE TABLE t1; DROP TABLE t1; CREATE TABLE t1 (i INT COLLATE utf8_bin, c INT COLLATE utf8_bin GENERATED ALWAYS AS (10)); SHOW CREATE TABLE t1; DROP TABLE t1; --echo # Check for a charset mismatch processing: --error ER_COLLATION_CHARSET_MISMATCH CREATE TABLE t1 (t CHAR(10) CHARACTER SET utf8 COLLATE ascii_bin GENERATED ALWAYS AS ("foo bar")); --echo # Check for a sorting order support: CREATE TABLE t1 (c CHAR(10) CHARSET latin1 COLLATE latin1_bin, c_ci CHAR(10) CHARSET latin1 COLLATE latin1_general_ci GENERATED ALWAYS AS (c), c_cs CHAR(10) CHARSET latin1 COLLATE latin1_general_cs GENERATED ALWAYS AS (c)); INSERT INTO t1 (c) VALUES ('a'), ('A'), ('b'); SELECT * FROM t1 ORDER BY c; SELECT * FROM t1 ORDER BY c_ci, c; SELECT * FROM t1 ORDER BY c_cs; --sorted_result SELECT c, c_ci REGEXP 'A', c_cs REGEXP 'A' FROM t1; DROP TABLE t1; if(! $testing_ndb) { --echo # Bug #21469535: VALGRIND ERROR (CONDITIONAL JUMP) WHEN INSERT --echo # ROWS INTO A PARTITIONED TABLE --echo # CREATE TABLE t1 ( id INT NOT NULL, store_id INT NOT NULL, x INT GENERATED ALWAYS AS (id + store_id) ) PARTITION BY RANGE (store_id) ( PARTITION p0 VALUES LESS THAN (6), PARTITION p1 VALUES LESS THAN (11), PARTITION p2 VALUES LESS THAN (16), PARTITION p3 VALUES LESS THAN (21) ); INSERT INTO t1 VALUES(1, 2, default); DROP TABLE t1; } --echo # Bug#21465626:ASSERT/CRASH ON DROPPING/ADDING VIRTUAL COLUMN CREATE TABLE t (a int(11), b int(11), c int(11) GENERATED ALWAYS AS (a+b) VIRTUAL, d int(11) GENERATED ALWAYS AS (a+b) VIRTUAL); INSERT INTO t(a,b) VALUES(1,2); --enable_info --echo # Mixed drop/add/rename virtual with non-virtual columns, --echo # ALGORITHM=INPLACE is not supported for InnoDB ALTER TABLE t DROP d, ADD e varchar(10); ALTER TABLE t ADD d int, ADD f char(10) AS ('aaa'); ALTER TABLE t CHANGE d dd int, CHANGE f ff varchar(10) AS ('bbb'); --echo # Only drop/add/change virtual, inplace is supported for Innodb ALTER TABLE t DROP c, DROP ff; ALTER TABLE t ADD c int(11) as (a+b), ADD f varchar(10) as ('aaa'); ALTER TABLE t CHANGE c c int(11) as (a), CHANGE f f varchar(10) as('bbb'); --echo # Change order should be ALGORITHM=INPLACE on Innodb ALTER TABLE t CHANGE c c int(11) as (a) after f; ALTER TABLE t CHANGE b b int(11) after c; --echo # TODO: Changing virtual column type should be ALGORITHM=INPLACE on InnoDB, current it goes only with COPY method ALTER TABLE t CHANGE c c varchar(10) as ('a'); --echo # Changing stored column type is ALGORITHM=COPY ALTER TABLE t CHANGE dd d varchar(10); if ($support_virtual_index) { ALTER TABLE t ADD INDEX idx(a), ADD INDEX idx1(c); ALTER TABLE t RENAME INDEX idx TO idx2, RENAME INDEX idx1 TO idx3; ALTER TABLE t DROP INDEX idx2, DROP INDEX idx3; ALTER TABLE t ADD INDEX idx(c), ADD INDEX idx1(d); ALTER TABLE t DROP INDEX idx, DROP INDEX idx1; } --disable_info DROP TABLE t; --echo # --echo # Bug#21900170: CAN'T CREATE TABLE WITH NULLABLE GENERATED COLUMNS --echo # CREATE TABLE t1 ( a INT, b INT GENERATED ALWAYS AS (-a) VIRTUAL NULL, c INT GENERATED ALWAYS AS (a + b) STORED NULL); --replace_column 8 # SHOW FULL COLUMNS FROM t1; INSERT INTO t1 (a) VALUES (NULL), (1); SELECT * FROM t1; DROP TABLE t1; --echo # Bug#21854004: GCOLS:INNODB: FAILING ASSERTION: I < TABLE->N_DEF CREATE TABLE t1( col1 INTEGER PRIMARY KEY, col2 INTEGER, col3 INTEGER, col4 INTEGER, vgc1 INTEGER AS (col2 + col3) VIRTUAL, sgc1 INTEGER AS (col2 - col3) STORED ); INSERT INTO t1(col1, col2, col3) VALUES (1, 10, 100), (2, 20, 200); SELECT * FROM t1 order by col1; # Change expression of a virtual generated column ALTER TABLE t1 MODIFY COLUMN vgc1 INTEGER AS (col2 * col3) VIRTUAL; SELECT * FROM t1 order by col1; # Change expression of a stored generated column ALTER TABLE t1 MODIFY COLUMN sgc1 INTEGER AS (col2 / col3) STORED; SELECT * FROM t1 order by col1; ALTER TABLE t1 MODIFY COLUMN vgc1 INTEGER AS (col2 + col3) VIRTUAL; ALTER TABLE t1 MODIFY COLUMN sgc1 INTEGER AS (col2 - col3) STORED; if ($support_virtual_index) { ALTER TABLE t1 ADD INDEX vgc1 (vgc1); } ALTER TABLE t1 ADD INDEX sgc1 (sgc1); if ($support_virtual_index) { # Change expression of a virtual generated column, with index ALTER TABLE t1 MODIFY COLUMN vgc1 INTEGER AS (col2 * col3) VIRTUAL; SELECT * FROM t1 order by col1; SELECT vgc1 FROM t1 order by vgc1; } # Change expression of a stored generated column, with index ALTER TABLE t1 MODIFY COLUMN sgc1 INTEGER AS (col2 / col3) STORED; SELECT * FROM t1 order by col1; SELECT sgc1 FROM t1 order by sgc1; if ($support_virtual_index) { ALTER TABLE t1 DROP INDEX vgc1; } ALTER TABLE t1 DROP INDEX sgc1; if ($support_virtual_index) { ALTER TABLE t1 MODIFY COLUMN vgc1 INTEGER AS (col2 + col3) VIRTUAL; ALTER TABLE t1 ADD UNIQUE INDEX vgc1 (vgc1); } ALTER TABLE t1 MODIFY COLUMN sgc1 INTEGER AS (col2 - col3) STORED; ALTER TABLE t1 ADD UNIQUE INDEX sgc1 (sgc1); # Change expression of a virtual generated column, with unique index if ($support_virtual_index) { --error ER_DUP_ENTRY ALTER TABLE t1 MODIFY COLUMN vgc1 INTEGER AS (col2 / col3) VIRTUAL; } --error ER_DUP_ENTRY ALTER TABLE t1 MODIFY COLUMN sgc1 INTEGER AS (col2 / col3) STORED; ALTER TABLE t1 MODIFY COLUMN vgc1 INTEGER AS (col2 * col3) VIRTUAL; SELECT * FROM t1 order by col1; SELECT vgc1 FROM t1 order by col1; ALTER TABLE t1 MODIFY COLUMN sgc1 INTEGER AS (col2 * col3) STORED; SELECT * FROM t1 order by col1; SELECT sgc1 FROM t1 order by sgc1; # Change virtual generated column to become stored --error ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN ALTER TABLE t1 MODIFY COLUMN vgc1 INTEGER AS (col2 * col3) STORED; # Change stored generated column to become virtual --error ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN ALTER TABLE t1 MODIFY COLUMN sgc1 INTEGER AS (col2 / col3) VIRTUAL; # Change base column to become stored generated column: ALTER TABLE t1 MODIFY COLUMN col4 INTEGER AS (col1 + col2 + col3) STORED; SELECT * FROM t1 order by col1; # Change stored generated column to become base column: ALTER TABLE t1 MODIFY COLUMN col4 INTEGER; SELECT * FROM t1 order by col1; DROP TABLE t1; if ($support_virtual_index) { --echo # --echo # bug#22018979: RECORD NOT FOUND ON UPDATE, --echo # VIRTUAL COLUMN, ASSERTION 0 --disable_warnings SET @sql_mode_save= @@sql_mode; SET sql_mode= 'ANSI'; CREATE TABLE t1 ( a INT, b VARCHAR(10), c CHAR(3) GENERATED ALWAYS AS (substr(b,1,3)) VIRTUAL, PRIMARY KEY (a), KEY c(c) ); INSERT INTO t1(a, b) values(1, 'bbbb'), (2, 'cc'); SHOW CREATE TABLE t1; SELECT * FROM t1 order by a; SET sql_mode= ''; FLUSH TABLE t1; SHOW CREATE TABLE t1; SELECT * FROM t1 order by a; DELETE FROM t1 where a= 2; SET sql_mode= @sql_mode_save; DROP TABLE t1; --enable_warnings } --echo # --echo # Bug#22680839: DEFAULT IS NOT DETERMINISTIC AND SHOULD NOT BE --echo # ALLOWED IN GENERATED COLUMNS --echo # if ($support_virtual_index) { CREATE TABLE tzz(a INT DEFAULT 5, gc1 INT AS (a+DEFAULT(a)) VIRTUAL, gc2 INT AS (a+DEFAULT(a)) STORED, KEY k1(gc1)); INSERT INTO tzz(A) VALUES (1); SELECT * FROM tzz; SELECT gc1 FROM tzz; ALTER TABLE tzz MODIFY COLUMN a INT DEFAULT 6; SELECT * FROM tzz; SELECT gc1 FROM tzz; DROP TABLE tzz; } --echo # Test 1: ALTER DEFAULT --echo # CREATE TABLE t1(a INT PRIMARY KEY DEFAULT 5, b INT AS (1 + DEFAULT(a)) STORED, c INT AS (1 + DEFAULT(a)) VIRTUAL); INSERT INTO t1 VALUES (); --error ER_ALTER_OPERATION_NOT_SUPPORTED ALTER TABLE t1 ALTER COLUMN a SET DEFAULT 7, ALGORITHM = INPLACE; --disable_warnings # Check how many rows are accessed: >0 = COPY --enable_info ALTER TABLE t1 ALTER COLUMN a SET DEFAULT 7; ALTER TABLE t1 MODIFY COLUMN a INT DEFAULT 8; ALTER TABLE t1 CHANGE COLUMN a a DOUBLE DEFAULT 5; --disable_info DROP TABLE t1; --echo # Test 2: ALTER DEFAULT + ADD GCOL --echo # CREATE TABLE t1(a INT PRIMARY KEY DEFAULT 5); INSERT INTO t1 VALUES(); --error ER_ALTER_OPERATION_NOT_SUPPORTED ALTER TABLE t1 ALTER COLUMN a SET DEFAULT 7, ADD COLUMN b INT AS (1 + DEFAULT(a)) STORED, ALGORITHM = INPLACE; --error ER_ALTER_OPERATION_NOT_SUPPORTED, ER_ALTER_OPERATION_NOT_SUPPORTED_REASON ALTER TABLE t1 ALTER COLUMN a SET DEFAULT 7, ADD COLUMN c INT AS (1 + DEFAULT(a)) VIRTUAL, ALGORITHM = INPLACE; # Check how many rows are accessed: >0 = COPY --enable_info ALTER TABLE t1 ALTER COLUMN a SET DEFAULT 7, ADD COLUMN b INT AS (1 + DEFAULT(a)) STORED, ADD COLUMN c INT AS (1 + DEFAULT(a)) VIRTUAL; --disable_info DROP TABLE t1; --enable_warnings