Re: Index-only scan returns incorrect results when using acomposite GIST index with a gist_trgm_ops column.

At Thu, 01 Mar 2018 15:39:18 -0500, Tom Lane <tgl@sss.pgh.pa.us> wrote in <22609.1519936758@sss.pgh.pa.us>
> Kyotaro HORIGUCHI <horiguchi.kyotaro@lab.ntt.co.jp> writes:
> > At Wed, 24 Jan 2018 00:13:51 +0300, Sergei Kornilov <sk@zsrv.org> wrote in <348951516742031@web54j.yandex.ru>
> >> Should we also make backport to older versions? I test on REL_10_STABLE - patch builds and works ok, but "make
check"fails on new testcase with error:
 
> > CREATE INDEX ON t USING gist (a test_inet_ops, a inet_ops);
> > + ERROR:  missing support function 4 for attribute 1 of index "t_a_a1_idx"
> >> and with different explain results.
> 
> > Thank you for checking that. d3a4f89 allowed that and
> > inet_gist_decompress is removed at the same time. Unfortunately I
> > didn't find a type on master that has both decompress and fetch
> > methods so I prefer to split the regression patch among target
> > versions.
> 
> I pushed this fix with minor adjustments.  I did not like the proposed

Thank you.

> regression test at all: it was overcomplicated and the need for different
> versions for different back branches wasn't fun either.  After some poking
> around I found that the bug could be exhibited using just btree_gist's
> gist_inet_ops, since the core inet_ops class indexes the same datatype and
> it does have a fetch function.  So I added a test case in btree_gist.

Ah, It wasn't in my sight to test core in contrib. Thanks for
improving it.

regards,

-- 
Kyotaro Horiguchi
NTT Open Source Software Center