| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andrew Dunstan <andrew(at)dunslane(dot)net>, Merlin Moncure <mmoncure(at)gmail(dot)com>, Jaime Casanova <jaime(at)2ndquadrant(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: final patch - plpgsql: for-in-array |
| Date: | 2010-11-18 19:28:40 |
| Message-ID: | 5871.1290108520@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> "unnest" returns all fields, but
> these fields should not be used. There isn't possible to say - stop, I
> don't need other fields. It's possible just with special PL statement,
> because it is controlled by PL. So it is reason why I don't believe in
> optimizations on PL level.
That is complete nonsense. array_unnest doesn't return the whole array
contents at once, so it's just as capable of being optimized as any
single-purpose implementation. If you exit the loop early, you just
don't call it anymore.
regards, tom lane
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