diff options
| -rw-r--r-- | src/backend/commands/tablecmds.c | 22 | ||||
| -rw-r--r-- | src/test/regress/expected/alter_table.out | 8 | ||||
| -rw-r--r-- | src/test/regress/sql/alter_table.sql | 8 |
3 files changed, 38 insertions, 0 deletions
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index 5252c971eec..016ae0a65f9 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -13561,6 +13561,14 @@ ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode) Oid relid; relid = IndexGetRelation(oldId, false); + + /* + * As above, make sure we have lock on the index's table if it's not + * the same table. + */ + if (relid != tab->relid) + LockRelationOid(relid, AccessExclusiveLock); + ATPostAlterTypeParse(oldId, relid, InvalidOid, (char *) lfirst(def_item), wqueue, lockmode, tab->rewrite); @@ -13577,6 +13585,20 @@ ATPostAlterTypeCleanup(List **wqueue, AlteredTableInfo *tab, LOCKMODE lockmode) Oid relid; relid = StatisticsGetRelation(oldId, false); + + /* + * As above, make sure we have lock on the statistics object's table + * if it's not the same table. However, we take + * ShareUpdateExclusiveLock here, aligning with the lock level used in + * CreateStatistics and RemoveStatisticsById. + * + * CAUTION: this should be done after all cases that grab + * AccessExclusiveLock, else we risk causing deadlock due to needing + * to promote our table lock. + */ + if (relid != tab->relid) + LockRelationOid(relid, ShareUpdateExclusiveLock); + ATPostAlterTypeParse(oldId, relid, InvalidOid, (char *) lfirst(def_item), wqueue, lockmode, tab->rewrite); diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out index de757a94dab..29b7c305789 100644 --- a/src/test/regress/expected/alter_table.out +++ b/src/test/regress/expected/alter_table.out @@ -4588,6 +4588,14 @@ create table attbl(a int); create table atref(b attbl check ((b).a is not null)); alter table attbl alter column a type numeric; -- someday this should work ERROR: cannot alter table "attbl" because column "atref.b" uses its row type +alter table atref drop constraint atref_b_check; +create statistics atref_stat on ((b).a is not null) from atref; +alter table attbl alter column a type numeric; -- someday this should work +ERROR: cannot alter table "attbl" because column "atref.b" uses its row type +drop statistics atref_stat; +create index atref_idx on atref (((b).a)); +alter table attbl alter column a type numeric; -- someday this should work +ERROR: cannot alter table "attbl" because column "atref.b" uses its row type drop table attbl, atref; /* End test case for bug #18970 */ -- Test that ALTER TABLE rewrite preserves a clustered index diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql index b4380ca4b9c..c45f9af17d0 100644 --- a/src/test/regress/sql/alter_table.sql +++ b/src/test/regress/sql/alter_table.sql @@ -3025,6 +3025,14 @@ drop table attbl, atref; create table attbl(a int); create table atref(b attbl check ((b).a is not null)); alter table attbl alter column a type numeric; -- someday this should work +alter table atref drop constraint atref_b_check; + +create statistics atref_stat on ((b).a is not null) from atref; +alter table attbl alter column a type numeric; -- someday this should work +drop statistics atref_stat; + +create index atref_idx on atref (((b).a)); +alter table attbl alter column a type numeric; -- someday this should work drop table attbl, atref; /* End test case for bug #18970 */ |