From: Tomas Vondra <tomas.vondra@2ndquadrant.com>
To: Ildus K <i.kurbangaliev@postgrespro.ru>
Cc: pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] Custom compression methods
Date: Tue, 21 Nov 2017 21:42:37 +0100
Message-ID: <58c00f6a-8315-dc5d-1e2b-10861a86200f@2ndquadrant.com> (raw)
In-Reply-To: <20171121232855.349e14a9@postgrespro.ru>
References: <20170907194236.4cefce96@wp.localdomain>
<20170912175505.4afa11fd@wp.localdomain>
<20171102152836.60c041e4@wp.localdomain>
<20171114162356.52e3d388@wp.localdomain>
<62e46a47-08a8-6e06-5e4f-6f52e0a13202@2ndquadrant.com>
<20171121174717.69ecd8f4@wp.localdomain>
<bfb3d34e-ba74-02cb-ca2a-43344866d9fd@2ndquadrant.com>
<20171121232855.349e14a9@postgrespro.ru>
On 11/21/2017 09:28 PM, Ildus K wrote:
>> Hmmm, it still doesn't work for me. See this:
>>
>> test=# create extension pg_lz4 ;
>> CREATE EXTENSION
>> test=# create table t_lz4 (v text compressed lz4);
>> CREATE TABLE
>> test=# create table t_pglz (v text);
>> CREATE TABLE
>> test=# insert into t_lz4 select repeat(md5(1::text),300);
>> INSERT 0 1
>> test=# insert into t_pglz select * from t_lz4;
>> INSERT 0 1
>> test=# drop extension pg_lz4 cascade;
>> NOTICE: drop cascades to 2 other objects
>> DETAIL: drop cascades to compression options for lz4
>> drop cascades to table t_lz4 column v
>> DROP EXTENSION
>> test=# \c test
>> You are now connected to database "test" as user "user".
>> test=# insert into t_lz4 select repeat(md5(1::text),300);^C
>> test=# select * from t_pglz ;
>> ERROR: cache lookup failed for compression options 16419
>>
>> That suggests no recompression happened.
>
> I will check that. Is your extension published somewhere?
>
No, it was just an experiment, so I've only attached it to the initial
review. Attached is an updated version, with a fix or two.
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
Attachments:
pg_lz4.tgz (application/x-compressed-tar, 1.5K) download
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To: pgsql-hackers@postgresql.org
Cc: tomas.vondra@2ndquadrant.com, i.kurbangaliev@postgrespro.ru
Subject: Re: [HACKERS] Custom compression methods
In-Reply-To: <58c00f6a-8315-dc5d-1e2b-10861a86200f@2ndquadrant.com>
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