Re: Showing primitive index scan count in EXPLAIN ANALYZE (for skip scan and SAOP scans)
От | Peter Geoghegan |
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Тема | Re: Showing primitive index scan count in EXPLAIN ANALYZE (for skip scan and SAOP scans) |
Дата | |
Msg-id | CAH2-WzkYXSnM60ZNo-vQLxFoGzHLHFD0x=iPHF6VGxiZmWUuwQ@mail.gmail.com обсуждение исходный текст |
Ответ на | Re: Showing primitive index scan count in EXPLAIN ANALYZE (for skip scan and SAOP scans) (Robert Haas <robertmhaas@gmail.com>) |
Ответы |
Re: Showing primitive index scan count in EXPLAIN ANALYZE (for skip scan and SAOP scans)
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Список | pgsql-hackers |
Committed just now. Thanks again. On Mon, Mar 3, 2025 at 4:01 PM Robert Haas <robertmhaas@gmail.com> wrote: > On Thu, Feb 27, 2025 at 7:58 PM Peter Geoghegan <pg@bowt.ie> wrote: > > It's easy to produce an example that makes intuitive sense. For > > example, with skip scan that has a qual such as "WHERE a BETWEEN 1 and > > 5 AND b = 12345", it is likely that EXPLAIN ANALYZE will show "Index > > Searches: 5" -- one search per "a" value. Such an example might be > > more useful than my original pgbench_accounts example. > > > > Do you think that that would help? > > Yes. As you might have seen already, I added an example involving SAOPs to "14.1.2. EXPLAIN ANALYZE". I have a TODO item about adding an additional example involving skip scan immediately afterwards, as part of the skip scan patch. > > Perhaps a comment noting why the new counter lives in IndexScanDesc would help? > > +1. Added a IndexScanDesc comment about this to the committed version. -- Peter Geoghegan
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