Reset internal ctxs in fini_local_cache only when they actually exist.

Author: arssher

Diff for: expected/pathman_cache_pranks.out

@@ -14,6 +14,11 @@ CREATE EXTENSION pg_pathman;
 DROP EXTENSION pg_pathman;
 -- create it for further tests
 CREATE EXTENSION pg_pathman;
+-- make sure nothing breaks on disable/enable
+SET pg_pathman.enable = false;
+NOTICE:  RuntimeAppend, RuntimeMergeAppend and PartitionFilter nodes and some other options have been disabled
+SET pg_pathman.enable = true;
+NOTICE:  RuntimeAppend, RuntimeMergeAppend and PartitionFilter nodes and some other options have been enabled
 -- 079797e0d5
 CREATE TABLE part_test(val serial);
 INSERT INTO part_test SELECT generate_series(1, 30);

Diff for: sql/pathman_cache_pranks.sql

@@ -16,6 +16,10 @@ DROP EXTENSION pg_pathman;
 -- create it for further tests
 CREATE EXTENSION pg_pathman;
 
+-- make sure nothing breaks on disable/enable
+SET pg_pathman.enable = false;
+SET pg_pathman.enable = true;
+
 -- 079797e0d5
 CREATE TABLE part_test(val serial);
 INSERT INTO part_test SELECT generate_series(1, 30);

Diff for: src/init.c

@@ -403,9 +403,12 @@ fini_local_cache(void)
 	}
 
 	/* Now we can clear allocations */
-	MemoryContextReset(PathmanParentsCacheContext);
-	MemoryContextReset(PathmanStatusCacheContext);
-	MemoryContextReset(PathmanBoundsCacheContext);
+	if (TopPathmanContext)
+	{
+		MemoryContextReset(PathmanParentsCacheContext);
+		MemoryContextReset(PathmanStatusCacheContext);
+		MemoryContextReset(PathmanBoundsCacheContext);
+	}
 }