Don't leak rd_statlist when a relcache entry is dropped.

tglsfdc · tglsfdc · commit fbcc9fe33c43 · 2021-03-18T20:37:09.000-04:00
Although these lists are usually NIL, and even when not empty are unlikely to be large, constant relcache update traffic could eventually result in visible bloat of CacheMemoryContext. Found via valgrind testing. Back-patch to v10 where this field was added. Discussion: https://postgr.es/m/3816764.1616104288@sss.pgh.pa.us
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
@@ -2348,6 +2348,7 @@ RelationDestroyRelation(Relation relation, bool remember_tupdesc)
 	FreeTriggerDesc(relation->trigdesc);
 	list_free_deep(relation->rd_fkeylist);
 	list_free(relation->rd_indexlist);
+	list_free(relation->rd_statlist);
 	bms_free(relation->rd_indexattr);
 	bms_free(relation->rd_keyattr);
 	bms_free(relation->rd_pkattr);
