pgsql: Ignore extra subquery outputs in set_subquery_size_estimates().

Ignore extra subquery outputs in set_subquery_size_estimates().

In commit 0f61d4dd1b4f95832dcd81c9688dac56fd6b5687, 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.

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/0044f456d909b12f6bea2fff4d48fc0848b1b54b

Modified Files
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src/backend/optimizer/path/costsize.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)