| From: | Andrey Lepikhov <a(dot)lepikhov(at)postgrespro(dot)ru> |
|---|---|
| To: | Greg Stark <stark(at)mit(dot)edu> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Ronan Dunklau <ronan(dot)dunklau(at)aiven(dot)io>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, Hywel Carver <hywel(at)skillerwhale(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Removing unneeded self joins |
| Date: | 2022-05-13 05:07:47 |
| Message-ID: | c0f41cba-659d-c6e1-7fb4-85e703dc2395@postgrespro.ru |
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| Thread: | |
| Lists: | pgsql-hackers |
New version of the feature.
Here a minor bug with RowMarks is fixed. A degenerated case is fixed,
when uniqueness of an inner deduced not from join quals, but from a
baserestrictinfo clauses 'x=const', where x - unique field.
Code, dedicated to solve second issue is controversial, so i attached
delta.txt for quick observation.
Maybe we should return to previous version of code, when we didn't split
restriction list into join quals and base quals?
--
Regards
Andrey Lepikhov
Postgres Professional
| Attachment | Content-Type | Size |
|---|---|---|
| v33-0001-Remove-self-joins.patch | text/x-patch | 84.3 KB |
| delta.txt | text/plain | 25.2 KB |
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