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Ignore extra subquery outputs in set_subquery_size_estimates().

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In commit 0f61d4dd1b, I added code to copy up
column width estimates for each column of a subquery.  That code supposed
that the subquery couldn't have any output columns that didn't correspond
to known columns of the current query level --- which is true when a query
is parsed from scratch, but the assumption fails when planning a view that
depends on another view that's been redefined (adding output columns) since
the upper view was made.  This results in an assertion failure or even a
crash, as per bug #8025 from lindebg.  Remove the Assert and instead skip
the column if its resno is out of the expected range.
This commit is contained in:
Tom Lane 2013-03-31 18:32:54 -04:00
parent 64f890905f
commit d931ac0ec4
1 changed files with 9 additions and 1 deletions
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10
src/backend/optimizer/path/costsize.c
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@ -3741,6 +3741,15 @@ set_subquery_size_estimates(PlannerInfo *root, RelOptInfo *rel)
if (te->resjunk)
continue;
/*
* The subquery could be an expansion of a view that's had columns
* added to it since the current query was parsed, so that there are
* non-junk tlist columns in it that don't correspond to any column
* visible at our query level. Ignore such columns.
*/
if (te->resno < rel->min_attr || te->resno > rel->max_attr)
continue;
/*
* XXX This currently doesn't work for subqueries containing set
* operations, because the Vars in their tlists are bogus references
@ -3762,7 +3771,6 @@ set_subquery_size_estimates(PlannerInfo *root, RelOptInfo *rel)
item_width = subrel->attr_widths[var->varattno - subrel->min_attr];
}
Assert(te->resno >= rel->min_attr && te->resno <= rel->max_attr);
rel->attr_widths[te->resno - rel->min_attr] = item_width;
}