database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-11 20:28:21 +03:00
Code Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

14
src/backend/executor/nodeHashjoin.c
View File

@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/executor/nodeHashjoin.c,v 1.103 2010/01/02 16:57:41 momjian Exp $
* $PostgreSQL: pgsql/src/backend/executor/nodeHashjoin.c,v 1.104 2010/07/12 17:01:05 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -842,7 +842,7 @@ ExecHashJoinGetSavedTuple(HashJoinState *hjstate,
void
ExecReScanHashJoin(HashJoinState *node, ExprContext *exprCtxt)
ExecReScanHashJoin(HashJoinState *node)
{
/*
* In a multi-batch join, we currently have to do rescans the hard way,
@ -854,7 +854,7 @@ ExecReScanHashJoin(HashJoinState *node, ExprContext *exprCtxt)
if (node->hj_HashTable != NULL)
{
if (node->hj_HashTable->nbatch == 1 &&
((PlanState *) node)->righttree->chgParam == NULL)
node->js.ps.righttree->chgParam == NULL)
{
/*
* okay to reuse the hash table; needn't rescan inner, either.
@ -880,8 +880,8 @@ ExecReScanHashJoin(HashJoinState *node, ExprContext *exprCtxt)
* if chgParam of subnode is not null then plan will be re-scanned
* by first ExecProcNode.
*/
if (((PlanState *) node)->righttree->chgParam == NULL)
ExecReScan(((PlanState *) node)->righttree, exprCtxt);
if (node->js.ps.righttree->chgParam == NULL)
ExecReScan(node->js.ps.righttree);
}
}
@ -900,6 +900,6 @@ ExecReScanHashJoin(HashJoinState *node, ExprContext *exprCtxt)
* if chgParam of subnode is not null then plan will be re-scanned by
* first ExecProcNode.
*/
if (((PlanState *) node)->lefttree->chgParam == NULL)
ExecReScan(((PlanState *) node)->lefttree, exprCtxt);
if (node->js.ps.lefttree->chgParam == NULL)
ExecReScan(node->js.ps.lefttree);
}