Re: PoC: Duplicate Tuple Elidation during External Sort for DISTINCT

From: Jon Nelson <jnelson+pgsql(at)jamponi(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: PoC: Duplicate Tuple Elidation during External Sort for DISTINCT
Date: 2014-01-27 01:01:37
Message-ID: CAKuK5J19xafujT_MjdkKGy-Pq1bMFziaC+P9tZiQGdFih02TRA@mail.gmail.com
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What are my next steps here?

I believe the concept is sound, the code is appears to work and
doesn't crash, and the result does show a performance win in most
cases (sometimes a big win). It's also incomplete, at least insofar
as it doesn't interface with the cost models at all, etc...

--
Jon

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