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Fix oversight in recent changes to enable the 'physical tlist'

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optimization for subquery and function scan nodes: we can't just do it
unconditionally, we still have to check whether there is any need for
a whole-row Var.  I had been thinking that these node types couldn't
have any system columns, which is true, but that loop is also checking
for attno zero, ie, whole-row Var.  Fix comment to not be so misleading.
Per test case from Richard Huxton.
This commit is contained in:
Tom Lane 2005-10-19 17:31:20 +00:00
parent b33a732264
commit 32fcfcdbd6
1 changed files with 10 additions and 13 deletions
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23
src/backend/optimizer/plan/createplan.c
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@ -10,7 +10,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.201 2005/10/15 02:49:20 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/createplan.c,v 1.202 2005/10/19 17:31:20 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -308,17 +308,13 @@ use_physical_tlist(RelOptInfo *rel)
int i;
/*
* OK for subquery and function scans; otherwise, can't do it for anything
* except real relations.
* We can do this for real relation scans, subquery scans, and function
* scans (but not for, eg, joins).
*/
if (rel->rtekind != RTE_RELATION)
{
if (rel->rtekind == RTE_SUBQUERY)
return true;
if (rel->rtekind == RTE_FUNCTION)
return true;
if (rel->rtekind != RTE_RELATION &&
rel->rtekind != RTE_SUBQUERY &&
rel->rtekind != RTE_FUNCTION)
return false;
}
/*
* Can't do it with inheritance cases either (mainly because Append
@ -328,15 +324,16 @@ use_physical_tlist(RelOptInfo *rel)
return false;
/*
* Can't do it if any system columns are requested, either. (This could
* possibly be fixed but would take some fragile assumptions in setrefs.c,
* I think.)
* Can't do it if any system columns or whole-row Vars are requested,
* either. (This could possibly be fixed but would take some fragile
* assumptions in setrefs.c, I think.)
*/
for (i = rel->min_attr; i <= 0; i++)
{
if (!bms_is_empty(rel->attr_needed[i - rel->min_attr]))
return false;
}
return true;
}