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, 30 deletions

diff --git a/src/backend/executor/nodeTidscan.c b/src/backend/executor/nodeTidscan.c
index 3560f8440ab..1b2454d49de 100644
--- a/src/backend/executor/nodeTidscan.c
+++ b/src/backend/executor/nodeTidscan.c
@@ -19,8 +19,6 @@
  *		ExecInitTidScan		creates and initializes state info.
  *		ExecReScanTidScan	rescans the tid relation.
  *		ExecEndTidScan		releases all storage.
- *		ExecTidMarkPos		marks scan position.
- *		ExecTidRestrPos		restores scan position.
  */
 #include "postgres.h"
 
@@ -441,34 +439,6 @@ ExecEndTidScan(TidScanState *node)
 }
 
 /* ----------------------------------------------------------------
- *		ExecTidMarkPos
- *
- *		Marks scan position by marking the current tid.
- *		Returns nothing.
- * ----------------------------------------------------------------
- */
-void
-ExecTidMarkPos(TidScanState *node)
-{
-	node->tss_MarkTidPtr = node->tss_TidPtr;
-}
-
-/* ----------------------------------------------------------------
- *		ExecTidRestrPos
- *
- *		Restores scan position by restoring the current tid.
- *		Returns nothing.
- *
- *		XXX Assumes previously marked scan position belongs to current tid
- * ----------------------------------------------------------------
- */
-void
-ExecTidRestrPos(TidScanState *node)
-{
-	node->tss_TidPtr = node->tss_MarkTidPtr;
-}
-
-/* ----------------------------------------------------------------
  *		ExecInitTidScan
  *
  *		Initializes the tid scan's state information, creates