Complain politely about access temp/unlogged tables during recovery.

This has never been supported, but we previously let md.c issue the
complaint for us at whatever point we tried to examine the backing file.
Now we print a nicer error message.

Per bug #6041, reported by Emanuel, and extensive discussion with Tom
Lane over where to put the check.

diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index fd8ea45b4a7bfb391e7bb003c2d34b7645826e81..b28681630b380d2b6df215978fb835ae922519f4 100644 (file)
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -90,6 +90,12 @@ get_relation_info(PlannerInfo *root, Oid relationObjectId, bool inhparent,
         */
        relation = heap_open(relationObjectId, NoLock);
 
+       /* Temporary and unlogged relations are inaccessible during recovery. */
+       if (!RelationNeedsWAL(relation) && RecoveryInProgress())
+               ereport(ERROR,
+                               (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+                                errmsg("cannot access temporary or unlogged relations during recovery")));
+
        rel->min_attr = FirstLowInvalidHeapAttributeNumber + 1;
        rel->max_attr = RelationGetNumberOfAttributes(relation);
        rel->reltablespace = RelationGetForm(relation)->reltablespace;