Remove dead code supporting mark/restore in SeqScan, TidScan, ValuesScan.

There seems no prospect that any of this will ever be useful, and indeed
it's questionable whether some of it would work if it ever got called;
it's certainly not been exercised in a very long time, if ever. So let's
get rid of it, and make the comments about mark/restore in execAmi.c less
wishy-washy.

The mark/restore support for Result nodes is also currently dead code,
but that's due to planner limitations not because it's impossible that
it could be useful.  So I left it in.

1 files changed, 0 insertions, 38 deletions

diff --git a/src/backend/executor/nodeSeqscan.c b/src/backend/executor/nodeSeqscan.c
index ab13e4729ee..53cfda5f9c2 100644
--- a/src/backend/executor/nodeSeqscan.c
+++ b/src/backend/executor/nodeSeqscan.c
@@ -19,8 +19,6 @@
  *		ExecInitSeqScan			creates and initializes a seqscan node.
  *		ExecEndSeqScan			releases any storage allocated.
  *		ExecReScanSeqScan		rescans the relation
- *		ExecSeqMarkPos			marks scan position
- *		ExecSeqRestrPos			restores scan position
  */
 #include "postgres.h"
 
@@ -274,39 +272,3 @@ ExecReScanSeqScan(SeqScanState *node)
 
 	ExecScanReScan((ScanState *) node);
 }
-
-/* ----------------------------------------------------------------
- *		ExecSeqMarkPos(node)
- *
- *		Marks scan position.
- * ----------------------------------------------------------------
- */
-void
-ExecSeqMarkPos(SeqScanState *node)
-{
-	HeapScanDesc scan = node->ss_currentScanDesc;
-
-	heap_markpos(scan);
-}
-
-/* ----------------------------------------------------------------
- *		ExecSeqRestrPos
- *
- *		Restores scan position.
- * ----------------------------------------------------------------
- */
-void
-ExecSeqRestrPos(SeqScanState *node)
-{
-	HeapScanDesc scan = node->ss_currentScanDesc;
-
-	/*
-	 * Clear any reference to the previously returned tuple.  This is needed
-	 * because the slot is simply pointing at scan->rs_cbuf, which
-	 * heap_restrpos will change; we'd have an internally inconsistent slot if
-	 * we didn't do this.
-	 */
-	ExecClearTuple(node->ss_ScanTupleSlot);
-
-	heap_restrpos(scan);
-}