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help / color / mirror / Atom feedFrom: Michael Paquier <[email protected]>
To: Robert Haas <[email protected]>
Cc: James Coleman <[email protected]>
Cc: pgsql-hackers <[email protected]>
Cc: Amit Kapila <[email protected]>
Cc: Tom Lane <[email protected]>
Subject: Re: Parallelize correlated subqueries that execute within each worker
Date: Fri, 3 Dec 2021 16:35:08 +0900
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA+TgmoaAPfPcQx0uYLusU4A+Vm5Cr2F8irxo=xf8BQ-97YyZ7A@mail.gmail.com>
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<CA+TgmoaAPfPcQx0uYLusU4A+Vm5Cr2F8irxo=xf8BQ-97YyZ7A@mail.gmail.com>
On Mon, Nov 15, 2021 at 10:01:37AM -0500, Robert Haas wrote:
> On Wed, Nov 3, 2021 at 1:34 PM James Coleman <[email protected]> wrote:
>> As I understand the current code, parallel plans are largely chosen
>> based not on where it's safe to insert a Gather node but rather by
>> determining if a given path is parallel safe. Through that lens params
>> are a bit of an odd man out -- they aren't inherently unsafe in the
>> way a parallel-unsafe function is, but they can only be used in
>> parallel plans under certain conditions (whether because of project
>> policy, performance, or missing infrastructure).
>
> Right.
Please note that the CF bot is complaining here, so I have moved this
patch to the next CF, but changed the status as waiting on author.
--
Michael
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