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Bug#121124 Ignore unchanged CHECK columns for online DDL #723

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Bug#121124 Ignore unchanged CHECK columns for online DDL #723

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0d894b7
Bug#121124 Ignore unchanged CHECK columns for online DDL
modasserbillah Aug 19, 2026
6682c32
Bug#121124 Normalize temporal types for CHECK evaluation
modasserbillah Aug 27, 2026
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10 changes: 10 additions & 0 deletions mysql-test/r/check_constraints.result
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Original file line number Diff line number Diff line change
Expand Up @@ -1259,6 +1259,16 @@ ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITH
ALTER TABLE t1 MODIFY COLUMN f1 INT DEFAULT 20, algorithm=copy;
ERROR HY000: Check constraint 't1_chk_1' is violated.
DROP TABLE t1;
#
# Bug#121124 - An unrelated CHECK constraint on DATETIME should not
# prevent an online ENUM extension.
#
CREATE TABLE t1 (e ENUM('a','b') NOT NULL, d DATETIME(6),
CONSTRAINT ck CHECK (d IS NULL));
ALTER TABLE t1 MODIFY e ENUM('a','b','c') NOT NULL, ALGORITHM=INSTANT;
ALTER TABLE t1 MODIFY e ENUM('a','b','c','d') NOT NULL, ALGORITHM=INPLACE;
ALTER TABLE t1 MODIFY d DATETIME(6) DEFAULT NULL, ALGORITHM=INPLACE;
DROP TABLE t1;
#-----------------------------------------------------------------------
# Test case to verify check constraint with CHANGE COLUMN syntax.
#-----------------------------------------------------------------------
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12 changes: 12 additions & 0 deletions mysql-test/t/check_constraints.test
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Expand Up @@ -789,6 +789,18 @@ ALTER TABLE t1 MODIFY COLUMN f1 INT DEFAULT 20, algorithm=copy;
DROP TABLE t1;


--echo #
--echo # Bug#121124 - An unrelated CHECK constraint on DATETIME should not
--echo # prevent an online ENUM extension.
--echo #
CREATE TABLE t1 (e ENUM('a','b') NOT NULL, d DATETIME(6),
CONSTRAINT ck CHECK (d IS NULL));
ALTER TABLE t1 MODIFY e ENUM('a','b','c') NOT NULL, ALGORITHM=INSTANT;
ALTER TABLE t1 MODIFY e ENUM('a','b','c','d') NOT NULL, ALGORITHM=INPLACE;
ALTER TABLE t1 MODIFY d DATETIME(6) DEFAULT NULL, ALGORITHM=INPLACE;
DROP TABLE t1;


--echo #-----------------------------------------------------------------------
--echo # Test case to verify check constraint with CHANGE COLUMN syntax.
--echo #-----------------------------------------------------------------------
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5 changes: 3 additions & 2 deletions sql/sql_table.cc
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Expand Up @@ -20916,9 +20916,10 @@ static bool is_any_check_constraints_evaluation_required(
continue;

// Check if data type is changed.
if (!my_strcasecmp(system_charset_info, itm_fld->field_name,
if (fld.change &&
!my_strcasecmp(system_charset_info, itm_fld->field_name,
fld.field_name) &&
(itm_fld->data_type() != fld.sql_type))
(itm_fld->data_type() != real_type_to_type(fld.sql_type)))
return true;
}

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