| From: | Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru> |
|---|---|
| To: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: Fix KNN GiST ordering type |
| Date: | 2016-02-02 10:24:57 |
| Message-ID: | CAPpHfdt1NqHp90ctEHkK11qSKMnLTLXM7uFNCGChHh4ruF43pQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Feb 1, 2016 at 7:31 PM, Alexander Korotkov <
a(dot)korotkov(at)postgrespro(dot)ru> wrote:
> KNN GiST detects which type it should return by returning type of ordering
> operator.
> But it appears that type of sk_func is detected after it was replaced with
> distance function. That is wrong: distance function should always return
> float8.
> I think it is just a typo.
>
I found this was introduced by this commit.
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commitdiff;h=821b821a2421beaa58225ff000833df69fb962c5;hp=284bef297733e553c73f1c858e0ce1532f754d18
However, commit message doesn't say anything special about this change.
------
Alexander Korotkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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