Purge prel_resowner hashtable in fini_local_cache.

Wobbling with it in 'resonwner_prel_callback' after all cache was purged is an
error.

Author: arssher

src/include/relation_info.h

@@ -401,6 +401,7 @@ void init_relation_info_static_data(void);
 /* For pg_pathman.enable_bounds_cache GUC */
 extern bool			pg_pathman_enable_bounds_cache;
 
+extern HTAB	   *prel_resowner;
 
 /* This allows us to track leakers of PartRelationInfo */
 #ifdef USE_RELINFO_LEAK_TRACKER
@@ -419,7 +420,7 @@ extern int			prel_resowner_line;
 		close_pathman_relation_info(prel); \
 		prel = NULL; \
 	} while (0)
-#endif
+#endif /* USE_RELINFO_LEAK_TRACKER */
 
 
 #endif /* RELATION_INFO_H */

src/init.c

@@ -389,6 +389,12 @@ fini_local_cache(void)
 	status_cache	= NULL;
 	bounds_cache	= NULL;
 
+	if (prel_resowner != NULL)
+	{
+		hash_destroy(prel_resowner);
+		prel_resowner = NULL;
+	}
+
 	/* Now we can clear allocations */
 	MemoryContextReset(PathmanParentsCacheContext);
 	MemoryContextReset(PathmanStatusCacheContext);

src/relation_info.c

@@ -129,8 +129,9 @@ static bool		delayed_shutdown = false; /* pathman was dropped */
 
 /*
  * PartRelationInfo is controlled by ResourceOwner;
+ * resowner -> List of controlled PartRelationInfos by this ResourceOwner
  */
-static HTAB	   *prel_resowner = NULL;
+HTAB	   *prel_resowner = NULL;
 
 
 /* Handy wrappers for Oids */