Add GUC variable cfs_compress_temp_relations

Author: knizhnik

src/backend/storage/file/cfs.c

@@ -79,6 +79,12 @@ bool cfs_encryption;
  */
 bool cfs_gc_verify_file;
 
+/*
+ * GUC variable - whther temporary relations should be compressed
+ */
+bool cfs_compress_temp_rels;
+
+
 /* GUC variable - Number of garbage collection background workers. Default = 1 */
 int cfs_gc_workers;
 /*

src/backend/storage/smgr/md.c

@@ -221,7 +221,7 @@ static bool md_use_compression(RelFileNodeBackend rnode, ForkNumber forknum)
 	if (forknum != MAIN_FORKNUM
 		|| rnode.node.spcNode == DEFAULTTABLESPACE_OID
 		|| rnode.node.spcNode == GLOBALTABLESPACE_OID
-		|| rnode.backend != InvalidBackendId
+		|| (rnode.backend != InvalidBackendId || cfs_compress_temp_rels)
 		|| rnode.node.relNode < FirstNormalObjectId)
 	{
 		return false;

src/backend/utils/misc/guc.c

@@ -1749,6 +1749,16 @@ static struct config_bool ConfigureNamesBool[] =
         NULL, NULL, NULL
     },
 
+	{
+		{"cfs_compress_temp_relations", PGC_SIGHUP, UNGROUPED,
+		 gettext_noop("Compress temporary relations"),
+		 NULL,
+        },
+		&cfs_compress_temp_rels,
+        false,
+        NULL, NULL, NULL
+    },
+
 	/* End-of-list marker */
 	{
 		{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL, NULL

src/include/storage/cfs.h

@@ -150,6 +150,7 @@ extern CfsState* cfs_state;
 extern int cfs_level;
 extern bool cfs_encryption;
 extern bool cfs_gc_verify_file;
+extern bool cfs_compress_temp_rels;
 
 extern int cfs_gc_delay;
 extern int cfs_gc_period;