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Ignore extra subquery outputs in set_subquery_size_estimates().

In commit0f61d4d, I added code to copy upcolumn width estimates for each column of a subquery. That code supposedthat the subquery couldn't have any output columns that didn't correspondto known columns of the current query level --- which is true when a queryis parsed from scratch, but the assumption fails when planning a view thatdepends on another view that's been redefined (adding output columns) sincethe upper view was made. This results in an assertion failure or even acrash, as per bug #8025 from lindebg. Remove the Assert and instead skipthe column if its resno is out of the expected range.

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src/backend/optimizer/path
- costsize.c

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`‎src/backend/optimizer/path/costsize.c‎`

Lines changed: 9 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -3741,6 +3741,15 @@ set_subquery_size_estimates(PlannerInfo root, RelOptInfo rel)`
`3741`	`3741`	`if (te->resjunk)`
`3742`	`3742`	`continue;`
`3743`	`3743`
	`3744`	`+/*`
	`3745`	`+ * The subquery could be an expansion of a view that's had columns`
	`3746`	`+ * added to it since the current query was parsed, so that there are`
	`3747`	`+ * non-junk tlist columns in it that don't correspond to any column`
	`3748`	`+ * visible at our query level. Ignore such columns.`
	`3749`	`+ */`
	`3750`	`+if (te->resno<rel->min_attr\|\|te->resno>rel->max_attr)`
	`3751`	`+continue;`
	`3752`	`+`
`3744`	`3753`	`/*`
`3745`	`3754`	`* XXX This currently doesn't work for subqueries containing set`
`3746`	`3755`	`* operations, because the Vars in their tlists are bogus references`
`@@ -3762,7 +3771,6 @@ set_subquery_size_estimates(PlannerInfo root, RelOptInfo rel)`
`3762`	`3771`
`3763`	`3772`	`item_width=subrel->attr_widths[var->varattno-subrel->min_attr];`
`3764`	`3773`	`}`
`3765`		`-Assert(te->resno >=rel->min_attr&&te->resno <=rel->max_attr);`
`3766`	`3774`	`rel->attr_widths[te->resno-rel->min_attr]=item_width;`
`3767`	`3775`	`}`
`3768`	`3776`

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Commitd931ac0

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`‎src/backend/optimizer/path/costsize.c‎`

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