diff options
Diffstat (limited to 'src/backend/commands/tablecmds.c')
| -rw-r--r-- | src/backend/commands/tablecmds.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c index ec974d11833..016717d6287 100644 --- a/src/backend/commands/tablecmds.c +++ b/src/backend/commands/tablecmds.c @@ -1213,13 +1213,14 @@ ExecuteTruncate(TruncateStmt *stmt) Relation rel; bool recurse = rv->inh; Oid myrelid; + LOCKMODE lockmode = AccessExclusiveLock; - rel = heap_openrv(rv, AccessExclusiveLock); + rel = heap_openrv(rv, lockmode); myrelid = RelationGetRelid(rel); /* don't throw error for "TRUNCATE foo, foo" */ if (list_member_oid(relids, myrelid)) { - heap_close(rel, AccessExclusiveLock); + heap_close(rel, lockmode); continue; } truncate_check_rel(rel); @@ -1231,7 +1232,7 @@ ExecuteTruncate(TruncateStmt *stmt) ListCell *child; List *children; - children = find_all_inheritors(myrelid, AccessExclusiveLock, NULL); + children = find_all_inheritors(myrelid, lockmode, NULL); foreach(child, children) { @@ -1242,6 +1243,22 @@ ExecuteTruncate(TruncateStmt *stmt) /* find_all_inheritors already got lock */ rel = heap_open(childrelid, NoLock); + + /* + * It is possible that the parent table has children that are + * temp tables of other backends. We cannot safely access + * such tables (because of buffering issues), and the best + * thing to do is to silently ignore them. Note that this + * check is the same as one of the checks done in + * truncate_check_rel() called below, still it is kept + * here for simplicity. + */ + if (RELATION_IS_OTHER_TEMP(rel)) + { + heap_close(rel, lockmode); + continue; + } + truncate_check_rel(rel); rels = lappend(rels, rel); relids = lappend_oid(relids, childrelid); |