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From: Alvaro Herrera <alvherre@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Jeff Janes <jeff.janes@gmail.com>
Cc: Sergey Burladyan <eshkinkot@gmail.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Looks like merge join planning time is too big, 55 seconds
Date: Fri, 2 Aug 2013 12:23:44 -0400
Message-ID: <20130802162344.GN5669@eldon.alvh.no-ip.org> (raw)
In-Reply-To: <1899.1375458648@sss.pgh.pa.us>
References: <CAJ2ymdjK-+LZHFY+cskRq98c_4F1PEfveOVNbNGpWL0Pczy5Ew@mail.gmail.com>
	<8761vpwid4.fsf@seb.koffice.internal>
	<CAMkU=1zyWZEC0YfQ0D4obWWHZqcLoLApUzf-f2+LOVH2ib=s_g@mail.gmail.com>
	<87li4lusvd.fsf@seb.koffice.internal>
	<CAMkU=1zuaFU7-DBJGawX+P+e4HjXmL+R_sxOLoB4Q18B5fRPHw@mail.gmail.com>
	<87li4l9j34.fsf@home.progtech.ru>
	<87k3k5kkup.fsf@home.progtech.ru>
	<CAMkU=1x51iVmUcLewMUBLB3fKW9tkpfsL0iYQuXp33aTAiQVPA@mail.gmail.com>
	<1899.1375458648@sss.pgh.pa.us>
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Tom Lane escribió:
> Jeff Janes <jeff.janes@gmail.com> writes:
> > On Thu, Aug 1, 2013 at 5:16 PM, Sergey Burladyan <eshkinkot@gmail.com> wrote:
> >> If I not mistaken, may be two code paths like this here:
> >> (1) mergejoinscansel -> scalarineqsel-> ineq_histogram_selectivity -> get_actual_variable_range -> index_getnext
> >> (2) scalargtsel -> scalarineqsel -> ineq_histogram_selectivity -> get_actual_variable_range -> index_getnext
> 
> > Yeah, I think you are correct.
> 
> mergejoinscansel does *not* call scalarineqsel, nor get_actual_variable_range.
> It calls get_variable_range, which only looks at the pg_statistic entries.

Uh?  It's right there in line 2976 in HEAD.


-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services


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