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From: Bruce Momjian <bruce@momjian.us>
To: Daniel Westermann (DWE) <daniel.westermann@dbi-services.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: Wrong example in the bloom documentation
Date: Fri, 9 Oct 2020 11:08:32 -0400
Message-ID: <20201009150832.GB1459@momjian.us> (raw)
In-Reply-To: <GVAP278MB01026C00EA4E25E35062483FD2080@GVAP278MB0102.CHEP278.PROD.OUTLOOK.COM>
References: <ZR0P278MB0122119FAE78721A694C30C8D2340@ZR0P278MB0122.CHEP278.PROD.OUTLOOK.COM>
	<GVAP278MB01028F3C84C0A724412854EDD20B0@GVAP278MB0102.CHEP278.PROD.OUTLOOK.COM>
	<20201008162310.GA13054@momjian.us>
	<GVAP278MB010226D15C90933B3C2D198BD20B0@GVAP278MB0102.CHEP278.PROD.OUTLOOK.COM>
	<2622731.1602186212@sss.pgh.pa.us>
	<20201008195352.GA5062@momjian.us>
	<GVAP278MB01026C00EA4E25E35062483FD2080@GVAP278MB0102.CHEP278.PROD.OUTLOOK.COM>

On Fri, Oct  9, 2020 at 05:44:57AM +0000, Daniel Westermann (DWE) wrote:
> Hi Bruce, Tom,
> 
> On Thu, Oct  8, 2020 at 03:43:32PM -0400, Tom Lane wrote:
> >> "Daniel Westermann (DWE)" <daniel.westermann@dbi-services.com> writes:
> >> >> I was hoping someone more experienced with this would comment, but
> >> >> seeing none, I will apply it in a day or two to all supported versions?
> >> >> Have you tested this output back to 9.5?
> >> 
> >> > I hoped that as well. No, I tested down to 9.6 because the change happened in 10.
> >> 
> >> The patch assumes that parallel query is enabled, which is not true by
> >> default before v10, so it should certainly not be applied before v10
> >> (at least not without significant revisions).
> 
> Yes, the behavior change was in 10. Before 10 the example is fine, I would not apply that to any prior version, otherwise the whole example needs to be rewritten.

Agreed.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EnterpriseDB                             https://enterprisedb.com

  The usefulness of a cup is in its emptiness, Bruce Lee






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