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Allow FDWs to push down quals without breaking EvalPlanQual rechecks.

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This fixes a long-standing bug which was discovered while investigating
the interaction between the new join pushdown code and the EvalPlanQual
machinery: if a ForeignScan appears on the inner side of a paramaterized
nestloop, an EPQ recheck would re-return the original tuple even if
it no longer satisfied the pushed-down quals due to changed parameter
values.

This fix adds a new member to ForeignScan and ForeignScanState and a
new argument to make_foreignscan, and requires changes to FDWs which
push down quals to populate that new argument with a list of quals they
have chosen to push down.  Therefore, I'm only back-patching to 9.5,
even though the bug is not new in 9.5.

Etsuro Fujita, reviewed by me and by Kyotaro Horiguchi.
This commit is contained in:
Robert Haas
2015-10-15 13:00:40 -04:00
parent 817588bc2b
commit 5fc4c26db5
13 changed files with 71 additions and 13 deletions
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4
src/backend/optimizer/plan/setrefs.c
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@ -1133,13 +1133,15 @@ set_foreignscan_references(PlannerInfo *root,
}
else
{
/* Adjust tlist, qual, fdw_exprs in the standard way */
/* Adjust tlist, qual, fdw_exprs, etc. in the standard way */
fscan->scan.plan.targetlist =
fix_scan_list(root, fscan->scan.plan.targetlist, rtoffset);
fscan->scan.plan.qual =
fix_scan_list(root, fscan->scan.plan.qual, rtoffset);
fscan->fdw_exprs =
fix_scan_list(root, fscan->fdw_exprs, rtoffset);
fscan->fdw_recheck_quals =
fix_scan_list(root, fscan->fdw_recheck_quals, rtoffset);
}
/* Adjust fs_relids if needed */