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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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30
src/backend/executor/nodeTidscan.c
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@ -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"
@ -440,34 +438,6 @@ ExecEndTidScan(TidScanState *node)
ExecCloseScanRelation(node->ss.ss_currentRelation);
}
/* ----------------------------------------------------------------
* 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
*