| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Mathieu Fenniak <mathieu(at)fenniak(dot)net> |
| Cc: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: Bug 4906 -- Left join of subselect incorrect |
| Date: | 2009-07-20 23:28:56 |
| Message-ID: | 29374.1248132536@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
Mathieu Fenniak <mathieu(at)fenniak(dot)net> writes:
> After running the attached setup.sql.gz SQL script on a PostgreSQL
> 8.4.0 database, the following two queries which should be logically
> identical return different results. As far as I can tell from the
> query analysis, the LEFT JOIN on query A is happening after
> "ee.projectid = pc.projectid" is filtered; therefore the rows where
> projectid is NULL are not visible in query A.
Yeah, it seems to be confused about whether it can interchange the
order of the semijoin and left join. I'll take a look.
regards, tom lane
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