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* Documentation mistake?
@ 2024-10-24 18:04 PG Doc comments form <noreply@postgresql.org>
2024-10-25 14:39 ` Re: Documentation mistake? David G. Johnston <david.g.johnston@gmail.com>
2024-10-25 14:44 ` Re: Documentation mistake? Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 2 replies; 3+ messages in thread
From: PG Doc comments form @ 2024-10-24 18:04 UTC (permalink / raw)
To: pgsql-docs@lists.postgresql.org; +Cc: fed.guman@gmail.com
The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/17/indexes-bitmap-scans.html
Description:
In page https://www.postgresql.org/docs/current/indexes-bitmap-scans.html
написано следующее:
"Another example is that if we have separate indexes on x and y, one
possible implementation of a query like WHERE x = 5 AND y = 6 is to use each
index with the appropriate query clause and then AND together the index
results to identify the result rows".
You mean "WHERE x = 5 OR y = 6"?
result from index scan by x + result from index scan by y
Thx.
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Documentation mistake?
2024-10-24 18:04 Documentation mistake? PG Doc comments form <noreply@postgresql.org>
@ 2024-10-25 14:39 ` David G. Johnston <david.g.johnston@gmail.com>
1 sibling, 0 replies; 3+ messages in thread
From: David G. Johnston @ 2024-10-25 14:39 UTC (permalink / raw)
To: fed.guman@gmail.com <fed.guman@gmail.com>; pgsql-docs@lists.postgresql.org <pgsql-docs@lists.postgresql.org>
On Thursday, October 24, 2024, PG Doc comments form <noreply@postgresql.org>
wrote:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/17/indexes-bitmap-scans.html
> Description:
>
> In page https://www.postgresql.org/docs/current/indexes-bitmap-scans.html
> написано следующее:
> "Another example is that if we have separate indexes on x and y, one
> possible implementation of a query like WHERE x = 5 AND y = 6 is to use
> each
> index with the appropriate query clause and then AND together the index
> results to identify the result rows".
>
>
This is a correct and intended sentence. The paragraph for bitmap covers
both OR from the earlier example and AND from this example.
David J.
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Documentation mistake?
2024-10-24 18:04 Documentation mistake? PG Doc comments form <noreply@postgresql.org>
@ 2024-10-25 14:44 ` Tom Lane <tgl@sss.pgh.pa.us>
1 sibling, 0 replies; 3+ messages in thread
From: Tom Lane @ 2024-10-25 14:44 UTC (permalink / raw)
To: fed.guman@gmail.com; +Cc: pgsql-docs@lists.postgresql.org
PG Doc comments form <noreply@postgresql.org> writes:
> In page https://www.postgresql.org/docs/current/indexes-bitmap-scans.html
> написано следующее:
> "Another example is that if we have separate indexes on x and y, one
> possible implementation of a query like WHERE x = 5 AND y = 6 is to use each
> index with the appropriate query clause and then AND together the index
> results to identify the result rows".
> You mean "WHERE x = 5 OR y = 6"?
No; the query says AND. Unioning the index results would be
appropriate if it said OR, but that's a different topic.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
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2024-10-24 18:04 Documentation mistake? PG Doc comments form <noreply@postgresql.org>
2024-10-25 14:39 ` David G. Johnston <david.g.johnston@gmail.com>
2024-10-25 14:44 ` Tom Lane <tgl@sss.pgh.pa.us>
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