Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtp (Exim 4.84_2) (envelope-from ) id 1agD3W-0007Om-KD for pgsql-performance@arkaria.postgresql.org; Wed, 16 Mar 2016 15:08:14 +0000 Received: from localhost ([127.0.0.1] helo=postgresql.org) by malur.postgresql.org with smtp (Exim 4.84_2) (envelope-from ) id 1agD3W-0005Bt-6V for pgsql-performance@arkaria.postgresql.org; Wed, 16 Mar 2016 15:08:14 +0000 Received: from makus.postgresql.org ([2001:4800:1501:1::229]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.84_2) (envelope-from ) id 1agD3V-00059e-40 for pgsql-performance@postgresql.org; Wed, 16 Mar 2016 15:08:13 +0000 Received: from post.visena.com ([46.226.10.50]) by makus.postgresql.org with esmtps (TLS1.2:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.84_2) (envelope-from ) id 1agD3R-00015q-Qk for pgsql-performance@postgresql.org; Wed, 16 Mar 2016 15:08:11 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=visena.com; s=20141101.wh; h=Content-Type:MIME-Version:Subject:In-Reply-To:Message-ID:To:From:Date; bh=Myyugayc1vlXZZi4OLkq4rijwnu9TG+86UYYPL8MMtM=; b=cBxbgvo2+8G1vPlBeyxKP7GGSqzjkz5n1IY5hww7RD49dFFzgTu7jo8xf9/dfXQ/bf0qXK6LHdmyFuA8H6iNqn9CN93H8Gv9ibxaL/RpxURojkUY6mDiwXJ+khLmH9iwJgLVfO/ZPlEgrnxv9k9RD5WnuKT+xoib7fYvXKb12PM=; Received: from [10.0.1.10] (helo=tc7-visena.wh.internal.visena.com) by post.visena.com with esmtp (Exim 4.82) (envelope-from ) id 1agD3M-0004dB-PW for pgsql-performance@postgresql.org; Wed, 16 Mar 2016 16:08:06 +0100 Received: from localhost ([127.0.0.1] helo=tc7-visena.wh.internal.visena.com) by tc7-visena.wh.internal.visena.com with esmtp (Exim 4.82) (envelope-from ) id 1agD3M-0002oF-OY for pgsql-performance@postgresql.org; Wed, 16 Mar 2016 16:08:04 +0100 Date: Wed, 16 Mar 2016 16:08:04 +0100 (CET) From: Andreas Joseph Krogh To: pgsql-performance@postgresql.org Message-ID: In-Reply-To: <9D98454D-D4E5-457F-8F5C-F49526BFA9FA@gmail.com> Subject: Re: Searching GIN-index (FTS) and sort by timestamp-column MIME-Version: 1.0 X-Mailer: Visena Mail 2.0.1-SNAPSHOT X-Spam-Score: 0.6 X-Spam-Report: SpamAssasin (score=0.6, required 5.0 ALL_TRUSTED=-1,HTML_IMAGE_ONLY_24=1.282,HTML_MESSAGE=0.001,HTML_SHORT_LINK_IMG_3=0.328) X-Pg-Spam-Score: -0.2 (/) Content-Type: multipart/related; boundary="----=_Part_416_1979968880.1458140884701" List-Archive: List-Help: List-ID: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: X-Mailing-List: pgsql-performance Precedence: bulk Sender: pgsql-performance-owner@postgresql.org ------=_Part_415_1173302574.1458140884701 Content-Type: multipart/related; boundary="----=_Part_416_1979968880.1458140884701" ------=_Part_416_1979968880.1458140884701 Content-Type: multipart/alternative; boundary="----=_Part_417_300750126.1458140884718" ------=_Part_417_300750126.1458140884718 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable P=C3=A5 onsdag 16. mars 2016 kl. 16:04:08, skrev Evgeniy Shishkin < itparanoia@gmail.com >: > On 16 Mar 2016, at 17:52, Evgeniy Shishkin wrote: > > >> On 16 Mar 2016, at 16:37, Tom Lane wrote: >> >> Andreas Joseph Krogh writes: >>> 1. Why isnt' folder_id part of the index-cond? >> >> Because a GIN index is useless for sorting. > > I don't see how gin inability to return sorted data relates to index=20 condition. > In fact i tried to reproduce the example, > and if i change folder_id to int from bigint, then index condition with= =20 folder_id is used > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Index Cond: ((fts_all @@ '''hi'''::tsqu= ery) AND (folder_id =3D 1)) > Looks like documentation=20 http://www.postgresql.org/docs/9.5/static/btree-gin.html is lying about supporting int8 type =C2=A0 Hm, interesting! =C2=A0 @Tom: Any idea why BIGINT doesn't work, but INTEGER does? =C2=A0 -- Andreas Joseph Krogh CTO / Partner - Visena AS Mobile: +47 909 56 963 andreas@visena.com www.visena.com =C2=A0 ------=_Part_417_300750126.1458140884718 Content-Type: text/html;charset=UTF-8 Content-Transfer-Encoding: quoted-printable
P=C3=A5 onsdag 16. mars 2016 kl. 16:04:08, skrev Evgeniy Shishkin <= itparanoia@gmail.com>:
> On 16 Mar 2016, at 17:52, Evgeniy Shishkin <itparanoia@gmail.com>= ; wrote:
>
>
>> On 16 Mar 2016, at 16:37, Tom Lane <tgl@sss.pgh.pa.us> wrote= :
>>
>> Andreas Joseph Krogh <andreas@visena.com> writes:
>>> 1. Why isnt' folder_id part of the index-cond?
>>
>> Because a GIN index is useless for sorting.
>
> I don't see how gin inability to return sorted data relates to index c= ondition.
> In fact i tried to reproduce the example,
> and if i change folder_id to int from bigint, then index condition wit= h folder_id is used
>
>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Index Cond: ((fts_all @@ '''hi'''::ts= query) AND (folder_id =3D 1))
>

Looks like documentation http://www.postgresql.org/docs/9.5/static/btree-gi= n.html
is lying about supporting int8 type
=C2=A0
Hm, interesting!
=C2=A0
@Tom: Any idea why BIGINT doesn't work, but INTEGER does?
=C2=A0
--
Andrea= s Joseph Krogh
CTO / Partner<= /span> - Visena AS
Mobile: +47 90= 9 56 963
=3D""
=C2=A0
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