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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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5
src/include/nodes/primnodes.h
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@@ -10,7 +10,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.156 2010/02/26 02:01:25 momjian Exp $
* $PostgreSQL: pgsql/src/include/nodes/primnodes.h,v 1.157 2010/07/12 17:01:06 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -175,7 +175,8 @@ typedef struct Const
* Such parameters are numbered from 1 to n.
*
* PARAM_EXEC: The parameter is an internal executor parameter, used
* for passing values into and out of sub-queries.
* for passing values into and out of sub-queries or from
* nestloop joins to their inner scans.
* For historical reasons, such parameters are numbered from 0.
* These numbers are independent of PARAM_EXTERN numbers.
*