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Make NestLoop plan nodes pass outer-relation variables into their inner

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relation using the general PARAM_EXEC executor parameter mechanism, rather
than the ad-hoc kluge of passing the outer tuple down through ExecReScan.
The previous method was hard to understand and could never be extended to
handle parameters coming from multiple join levels.  This patch doesn't
change the set of possible plans nor have any significant performance effect,
but it's necessary infrastructure for future generalization of the concept
of an inner indexscan plan.

ExecReScan's second parameter is now unused, so it's removed.
This commit is contained in:
Tom Lane
2010-07-12 17:01:06 +00:00
parent 5a3489357f
commit 53e757689c
76 changed files with 802 additions and 700 deletions
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13
src/backend/executor/nodeTidscan.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeTidscan.c,v 1.65 2010/01/02 16:57:45 momjian Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeTidscan.c,v 1.66 2010/07/12 17:01:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -17,7 +17,7 @@
*
* ExecTidScan scans a relation using tids
* ExecInitTidScan creates and initializes state info.
* ExecTidReScan rescans the tid relation.
* ExecReScanTidScan rescans the tid relation.
* ExecEndTidScan releases all storage.
* ExecTidMarkPos marks scan position.
* ExecTidRestrPos restores scan position.
@ -398,17 +398,12 @@ ExecTidScan(TidScanState *node)
}
/* ----------------------------------------------------------------
* ExecTidReScan(node)
* ExecReScanTidScan(node)
* ----------------------------------------------------------------
*/
void
ExecTidReScan(TidScanState *node, ExprContext *exprCtxt)
ExecReScanTidScan(TidScanState *node)
{
/* If we are being passed an outer tuple, save it for runtime key calc */
if (exprCtxt != NULL)
node->ss.ps.ps_ExprContext->ecxt_outertuple =
exprCtxt->ecxt_outertuple;
if (node->tss_TidList)
pfree(node->tss_TidList);
node->tss_TidList = NULL;