From: Tom Lane <tgl@sss.pgh.pa.us>
To: Jan Wieck <JanWieck@Yahoo.com>
Cc: Scott Cain <cain@cshl.org>
Cc: PgSQL Performance ML <pgsql-performance@postgresql.org>
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] EXTERNAL storage and substring on long strings
Date: Thu, 14 Aug 2003 14:00:21 -0400
Message-ID: <6311.1060884021@sss.pgh.pa.us> (raw)
In-Reply-To: <3F3BA49D.9070405@Yahoo.com>
References: <1059679600.1429.41.camel@localhost.localdomain>
<3F297CBA.1080703@joeconway.com>
<1059686498.7505.558.camel@haggis>
<1060010735.1433.26.camel@localhost.localdomain>
<3574.1060012423@sss.pgh.pa.us>
<3F3BA49D.9070405@Yahoo.com>
Jan Wieck <JanWieck@Yahoo.com> writes:
> Doesn't look that unrealistic to me. A plain text based substring
> function will reassemble the whole beast first before cutting out the
> wanted part. His manually chunked version will read only those chunks
> needed.
So does substr(), if applied to EXTERNAL (non-compressed) toasted text.
See John Gray's improvements a release or two back.
regards, tom lane
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To: pgsql-sql@postgresql.org
Cc: tgl@sss.pgh.pa.us, JanWieck@Yahoo.com, cain@cshl.org, pgsql-performance@postgresql.org
Subject: Re: [SQL] EXTERNAL storage and substring on long strings
In-Reply-To: <6311.1060884021@sss.pgh.pa.us>
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