Message-ID: <4EC60883.2050905@lab.ntt.co.jp>
Date: Fri, 18 Nov 2011 16:25:55 +0900
From: Etsuro Fujita <fujita.etsuro@lab.ntt.co.jp>
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To: Shigeru Hanada <shigeru.hanada@gmail.com>
CC: pgsql-hackers@postgresql.org
Subject: Re: WIP: Collecting statistics on CSV file data
References: <4E6DE18B.4010505@lab.ntt.co.jp> <4E7861C1.2000607@gmail.com>
	<4E8EC1D8.3080700@lab.ntt.co.jp> <4E9C6573.8050507@gmail.com>
	<4E9FF04B.3050504@lab.ntt.co.jp> <4EB7C07A.5030205@gmail.com>
In-Reply-To: <4EB7C07A.5030205@gmail.com>
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(2011/11/07 20:26), Shigeru Hanada wrote:
> (2011/10/20 18:56), Etsuro Fujita wrote:
>> I revised the patch according to Hanada-san's comments. Attached is the
>> updated version of the patch.
>>
>> Changes:
>>
>>     * pull up of logging "analyzing foo.bar"
>>     * new vac_update_relstats always called
>>     * tab-completion in psql
>>     * add "foreign tables are not analyzed automatically..." to 23.1.3
>> Updating Planner Statistics
>>     * some other modifications
> 
> Submission review
> =================
> 
> - Patch can be applied, and all regression tests passed. :)

Thank you for your testing.  I updated the patch according to your
comments.  Attached is the updated version of the patch.

> - file_fdw_do_analyze_rel is almost copy of do_analyze_rel.  IIUC,
> difference against do_analyze_rel are:
>      * don't logging analyze target
>      * don't switch userid to the owner of target table
>      * don't measure elapsed time for autoanalyze deamon
>      * don't handle index
>      * some comments are removed.
>      * sample rows are acquired by file_fdw's routine
> 
> I don't see any problem here, but would you confirm that all of them are
> intentional?

Yes.  But in the updated version, I've refactored analyze.c a little bit
to allow FDW authors to simply call do_analyze_rel().

> - In your design, each FDW have to copy most of do_analyze_rel to their
> own source.  It means that FDW authors must know much details of ANALYZE
> to implement ANALYZE handler.  Actually, your patch exports some static
> functions from analyze.c.  Have you considered hooking
> acquire_sample_rows()?  Such handler should be more simple, and
> FDW-specific.  As you say, such design requires FDWs to skip some
> records, but it would be difficult for some FDW (e.g. twitter_fdw) which
> can't pick sample data up easily.  IMHO such problem *must* be solved by
> FDW itself.

The updated version enables FDW authors to just write their own
acquire_sample_rows().  On the other hand, by retaining to hook
AnalyzeForeignTable routine at analyze_rel(), higher level than
acquire_sample_rows() as before, it allows FDW authors to write
AnalyzeForeignTable routine for foreign tables on a remote server to ask
the server for its current stats instead, as pointed out earlier by Tom
Lane.

Best regards,
Etsuro Fujita

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