From: Andreas Joseph Krogh <andreas@visena.com>
To: pgsql-performance@postgresql.org
Subject: Re: Searching GIN-index (FTS) and sort by timestamp-column
Date: Wed, 16 Mar 2016 16:08:04 +0100 (CET)
Message-ID: <VisenaEmail.59.14f5e83b9780ba86.1537ff78701@tc7-visena> (raw)
In-Reply-To: <9D98454D-D4E5-457F-8F5C-F49526BFA9FA@gmail.com>
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På onsdag 16. mars 2016 kl. 16:04:08, skrev Evgeniy Shishkin <
itparanoia@gmail.com <mailto: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
condition.
> In fact i tried to reproduce the example,
> and if i change folder_id to int from bigint, then index condition with
folder_id is used
>
> Index Cond: ((fts_all @@ '''hi'''::tsquery) AND (folder_id = 1))
>
Looks like documentation
http://www.postgresql.org/docs/9.5/static/btree-gin.html
is lying about supporting int8 type
Hm, interesting!
@Tom: Any idea why BIGINT doesn't work, but INTEGER does?
-- Andreas Joseph Krogh
CTO / Partner - Visena AS
Mobile: +47 909 56 963
andreas@visena.com <mailto:andreas@visena.com>
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Subject: Re: Searching GIN-index (FTS) and sort by timestamp-column
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