public inbox for [email protected]  

help / color / mirror / Atom feed

From: Tom Lane <[email protected]>
To: Marc-Olaf Jaschke <[email protected]>
Cc: [email protected]
Subject: Re: Improve hash join's handling of tuples with null join keys
Date: Sun, 24 Aug 2025 15:18:33 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>
	<[email protected]>

Marc-Olaf Jaschke <[email protected]> writes:
> I can confirm that the patch fixes the issue (Bug #19030). The memory usage remains within the expected range of work_mem.
> This also applies to parallel hash joins.
> The query also runs significantly faster.
> I also tested cases with multiple left joins.
> I have only observed this problem when there are many null values in the join column.

Thanks for testing!

			regards, tom lane

view thread (15+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected]
  Subject: Re: Improve hash join's handling of tuples with null join keys
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox