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MDEV-29001 DROP DEFAULT makes SHOW CREATE non-idempotent

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DROP DEFAULT adds DEFAULT NULL in case of nullable column. In case of
NOT NULL column it drops default expression if any exists.
This commit is contained in:
Aleksey Midenkov
2025-07-09 15:45:35 +03:00
committed by Sergei Golubchik
parent 67745e4dbf
commit 9a51709dba
9 changed files with 96 additions and 80 deletions
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3
sql/sql_table.cc
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@@ -8658,7 +8658,8 @@ mysql_prepare_alter_table(THD *thd, TABLE *table,
}
else
{
if ((def->default_value= alter->default_value))
if ((def->default_value= alter->default_value) ||
!(def->flags & NOT_NULL_FLAG))
def->flags&= ~NO_DEFAULT_VALUE_FLAG;
else
def->flags|= NO_DEFAULT_VALUE_FLAG;