Revert "Skip WAL for new relfilenodes, under wal_level=minimal."

This reverts commit cb2fd7eac285b1b0a24eeb2b8ed4456b66c5a09f.  Per
numerous buildfarm members, it was incompatible with parallel query, and
a test case assumed LP64.  Back-patch to 9.5 (all supported versions).

Discussion: https://postgr.es/m/20200321224920.GB1763544@rfd.leadboat.com

1 files changed, 11 insertions, 4 deletions

diff --git a/src/backend/commands/createas.c b/src/backend/commands/createas.c
index 588a5acc108..e75b4fd65fe 100644
--- a/src/backend/commands/createas.c
+++ b/src/backend/commands/createas.c
@@ -561,13 +561,16 @@ intorel_startup(DestReceiver *self, int operation, TupleDesc typeinfo)
 	myState->rel = intoRelationDesc;
 	myState->reladdr = intoRelationAddr;
 	myState->output_cid = GetCurrentCommandId(true);
-	myState->hi_options = HEAP_INSERT_SKIP_FSM;
-	myState->bistate = GetBulkInsertState();
 
 	/*
-	 * Valid smgr_targblock implies something already wrote to the relation.
-	 * This may be harmless, but this function hasn't planned for it.
+	 * We can skip WAL-logging the insertions, unless PITR or streaming
+	 * replication is in use. We can skip the FSM in any case.
 	 */
+	myState->hi_options = HEAP_INSERT_SKIP_FSM |
+		(XLogIsNeeded() ? 0 : HEAP_INSERT_SKIP_WAL);
+	myState->bistate = GetBulkInsertState();
+
+	/* Not using WAL requires smgr_targblock be initially invalid */
 	Assert(RelationGetTargetBlock(intoRelationDesc) == InvalidBlockNumber);
 }
 
@@ -611,6 +614,10 @@ intorel_shutdown(DestReceiver *self)
 
 	FreeBulkInsertState(myState->bistate);
 
+	/* If we skipped using WAL, must heap_sync before commit */
+	if (myState->hi_options & HEAP_INSERT_SKIP_WAL)
+		heap_sync(myState->rel);
+
 	/* close rel, but keep lock until commit */
 	heap_close(myState->rel, NoLock);
 	myState->rel = NULL;