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Have CLUSTER ignore partitions not owned by caller

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If a partitioned table has partitions owned by roles other than the
owner of the partitioned table, don't include them in the to-be-
clustered list.  This is similar to what VACUUM FULL does (except we do
it sooner, because there is no reason to postpone it).  Add a simple
test to verify that only owned partitions are clustered.

While at it, change memory context switch-and-back to occur once per
partition instead of outside of the loop.

Author: Justin Pryzby <pryzby@telsasoft.com>
Reviewed-by: Zhihong Yu <zyu@yugabyte.com>
Reviewed-by: Michael Paquier <michael@paquier.xyz>
Discussion: https://postgr.es/m/20220411140609.GF26620@telsasoft.com
This commit is contained in:
Alvaro Herrera
2022-04-14 22:11:06 +02:00
parent 275e719d91
commit 3f19e176ae
3 changed files with 56 additions and 7 deletions
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19
src/backend/commands/cluster.c
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@ -1647,10 +1647,8 @@ get_tables_to_cluster(MemoryContext cluster_context)
* Given an index on a partitioned table, return a list of RelToCluster for
* all the children leaves tables/indexes.
*
* Caller must hold lock on the table containing the index.
*
* Like expand_vacuum_rel, but here caller must hold AccessExclusiveLock
* on the table already.
* on the table containing the index.
*/
static List *
get_tables_to_cluster_partitioned(MemoryContext cluster_context, Oid indexOid)
@ -1663,9 +1661,6 @@ get_tables_to_cluster_partitioned(MemoryContext cluster_context, Oid indexOid)
/* Do not lock the children until they're processed */
inhoids = find_all_inheritors(indexOid, NoLock, NULL);
/* Use a permanent memory context for the result list */
old_context = MemoryContextSwitchTo(cluster_context);
foreach(lc, inhoids)
{
Oid indexrelid = lfirst_oid(lc);
@ -1676,12 +1671,22 @@ get_tables_to_cluster_partitioned(MemoryContext cluster_context, Oid indexOid)
if (get_rel_relkind(indexrelid) != RELKIND_INDEX)
continue;
/* Silently skip partitions which the user has no access to. */
if (!pg_class_ownercheck(relid, GetUserId()) &&
(!pg_database_ownercheck(MyDatabaseId, GetUserId()) ||
IsSharedRelation(relid)))
continue;
/* Use a permanent memory context for the result list */
old_context = MemoryContextSwitchTo(cluster_context);
rtc = (RelToCluster *) palloc(sizeof(RelToCluster));
rtc->tableOid = relid;
rtc->indexOid = indexrelid;
rtcs = lappend(rtcs, rtc);
MemoryContextSwitchTo(old_context);
}
MemoryContextSwitchTo(old_context);
return rtcs;
}