| From: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | David Steele <david(at)pgmasters(dot)net>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Andres Freund <andres(at)anarazel(dot)de>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Ildus Kurbangaliev <i(dot)kurbangaliev(at)gmail(dot)com>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | Re: [HACKERS] Custom compression methods |
| Date: | 2021-04-08 19:38:44 |
| Message-ID: | 20210408193844.GK6592@telsasoft.com |
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| Lists: | pgsql-hackers |
On Thu, Apr 08, 2021 at 02:58:04PM -0400, Robert Haas wrote:
> On Thu, Apr 8, 2021 at 11:32 AM David Steele <david(at)pgmasters(dot)net> wrote:
> > It looks like this CF entry should have been marked as committed so I
> > did that.
>
> Thanks.
>
> Here's a patch for the doc update which was mentioned as an open item upthread.
Thanks too.
It looks like this should not remove the word "data" ?
The compression technique used for either in-line or out-of-line compressed
-data is a fairly simple and very fast member
-of the LZ family of compression techniques. See
-<filename>src/common/pg_lzcompress.c</filename> for the details.
+can be selected using the <literal>COMPRESSION</literal> option on a per-column
+basis when creating a table. The default for columns with no explicit setting
+is taken from the value of <xref linkend="guc-default-toast-compression" />.
I thought this patch would need to update parts about borrowing 2 spare bits,
but maybe that's the wrong header..
--
Justin
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