Horton

Re: patch: fix performance problems with repated decomprimation of varlena values in plpgsql

Alvaro Herrera <alvherre@commandprompt.com>

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From: Alvaro Herrera <alvherre@commandprompt.com>
To: Pavel Stehule <pavel.stehule@gmail.com>
Cc: Andrew Dunstan <andrew@dunslane.net>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Robert Haas <robertmhaas@gmail.com>, Tom Lane <tgl@sss.pgh.pa.us>
Date: 2010-11-23T19:29:03Z
Lists: pgsql-hackers 
Excerpts from Pavel Stehule's message of lun nov 22 10:01:23 -0300 2010:

> sorry - it is related to tests from FOR-IN-ARRAY thread

> test query: select avg(array_upper(filter02(x,'%AA%', 10),1)) from t1000;

Yeah, I can measure a 25x improvement in that test with the patch
applied.

-- 
Álvaro Herrera <alvherre@commandprompt.com>
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