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

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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.
This commit is contained in:
Tom Lane
2014-11-20 20:20:54 -05:00
parent a34fa8ee7c
commit adbfab119b
11 changed files with 13 additions and 213 deletions
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38
src/backend/executor/nodeSeqscan.c
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@ -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);
}