Avoid losing track of data for shared tables in pgstats. Report by Michael

Fuhr, patch from Tom Lane after a messier suggestion by me.

diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
index 5529f2917bbeff5ff4cb54d76df6521f1cba74aa..edf150b9feeaea86747e9d9057fc299b8d56e539 100644 (file)
--- a/src/backend/postmaster/pgstat.c
+++ b/src/backend/postmaster/pgstat.c
@@ -919,7 +919,9 @@ pgstat_vacuum_tabstat(void)
 
                CHECK_FOR_INTERRUPTS();
 
-               if (hash_search(htab, (void *) &dbid, HASH_FIND, NULL) == NULL)
+               /* the DB entry for shared tables (with InvalidOid) is never dropped */
+               if (OidIsValid(dbid) &&
+                       hash_search(htab, (void *) &dbid, HASH_FIND, NULL) == NULL)
                        pgstat_drop_database(dbid);
        }