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pgsql: Fix an Assert that turns out to be reachable after all.

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Fix an Assert that turns out to be reachable after all.
Date: 2012-04-09 16:00:01
Message-ID: E1SHH0b-0006dx-4Z@gemulon.postgresql.org (view raw or flat)
Thread:
Lists: pgsql-committers
Fix an Assert that turns out to be reachable after all.

estimate_num_groups() gets unhappy with
	create table empty();
	select * from empty except select * from empty e2;
I can't see any actual use-case for such a query (and the table is illegal
per SQL spec), but it seems like a good idea that it not cause an assert
failure.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/65fd91333e45114c5d9a07d3d4f6a4786df48768

Modified Files
--------------
src/backend/utils/adt/selfuncs.c |    9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)

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Subject: pgsql: Remove documentation mention of pglesslog,which was added in 20
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Subject: pgsql: Don't bother copying empty support arrays in a zero-columnMerge

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