Re: using custom scan nodes to prototype parallel sequential scan

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: using custom scan nodes to prototype parallel sequential scan
Date: 2014-11-12 12:49:37
Message-ID: CA+TgmoZXg+SWcAR6b=RyRX6JqYQbEN21ZM3zt9rAr64GZy1hew@mail.gmail.com
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On Tue, Nov 11, 2014 at 7:48 PM, Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com> wrote:
> Isn't provolatile = PROVOLATILE_IMMUTABLE sufficient?

There are certainly things that are parallel-safe that are not
immutable. It might be the case that everything immutable is
parallel-safe.

--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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