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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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25
src/backend/executor/nodeValuesscan.c
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@ -246,7 +246,6 @@ ExecInitValuesScan(ValuesScan *node, EState *estate, int eflags)
/*
* Other node-specific setup
*/
scanstate->marked_idx = -1;
scanstate->curr_idx = -1;
scanstate->array_len = list_length(node->values_lists);
@ -293,30 +292,6 @@ ExecEndValuesScan(ValuesScanState *node)
ExecClearTuple(node->ss.ss_ScanTupleSlot);
}
/* ----------------------------------------------------------------
* ExecValuesMarkPos
*
* Marks scan position.
* ----------------------------------------------------------------
*/
void
ExecValuesMarkPos(ValuesScanState *node)
{
node->marked_idx = node->curr_idx;
}
/* ----------------------------------------------------------------
* ExecValuesRestrPos
*
* Restores scan position.
* ----------------------------------------------------------------
*/
void
ExecValuesRestrPos(ValuesScanState *node)
{
node->curr_idx = node->marked_idx;
}
/* ----------------------------------------------------------------
* ExecReScanValuesScan
*