| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | J Lumby <johnlumby(at)hotmail(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Set-Returning functions in a select list |
| Date: | 2021-07-24 16:03:42 |
| Message-ID: | 1163940.1627142622@sss.pgh.pa.us |
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| Lists: | pgsql-docs pgsql-general |
J Lumby <johnlumby(at)hotmail(dot)com> <DM5PR06MB3082AEC288F546F7AF5393E3A3E69(at)DM5PR06MB3082(dot)namprd06(dot)prod(dot)outlook(dot)com> writes:
> I am unclear about the rules which postgresql uses in building a result
> set when the select list ( see note ) contains several different
> Set-Returning functions, possibly with sets of different sizes.
The docs you want exist, but they're a bit buried ... see
https://www.postgresql.org/docs/current/xfunc-sql.html#XFUNC-SQL-FUNCTIONS-RETURNING-SET
In particular, the NOTE at the bottom of that section explains that
the behavior changed in v10.
regards, tom lane
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