| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, David Steele <david(at)pgmasters(dot)net>, Ildus Kurbangaliev <i(dot)kurbangaliev(at)gmail(dot)com>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Custom compression methods |
| Date: | 2021-03-19 20:38:03 |
| Message-ID: | CA+TgmobGm9umTgno4O4UqSAoGhOPOAA55uiKE8N_wehnHfg4Tw@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Mar 19, 2021 at 4:20 PM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Nope ... crake's displeased with your assumption that it's OK to
> clutter dumps with COMPRESSION clauses. As am I: that is going to
> be utterly fatal for cross-version transportation of dumps.
Yes, and prion's got this concerning diff:
Column | Type | Collation | Nullable | Default | Storage |
Compression | Stats target | Description
--------+---------+-----------+----------+---------+---------+-------------+--------------+-------------
- f1 | integer | | | | plain |
| |
+ f1 | integer | | | | plain | pglz
| |
Since the column is not a varlena, it shouldn't have a compression
method configured, yet on that machine it does, possibly because that
machine uses -DRELCACHE_FORCE_RELEASE -DCATCACHE_FORCE_RELEASE.
Regarding your point, that does look like clutter. We don't annotate
the dump with a storage clause unless it's non-default, so probably we
should do the same thing here. I think I gave Dilip bad advice here...
--
Robert Haas
EDB: http://www.enterprisedb.com
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