Re: plperl return array support revisited

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От Bruce Momjian
Тема Re: plperl return array support revisited
Дата
Msg-id 200507101532.j6AFWpa06654@candle.pha.pa.us
обсуждение исходный текст
Ответ на plperl return array support revisited  (Andrew Dunstan <andrew@dunslane.net>)
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Patch applied.  Thanks.

---------------------------------------------------------------------------


Andrew Dunstan wrote:
>
> Following up a previous thought I had, yesterday I realised how to
> return arays nicely without having to make the plperl programmer aware
> of anything. The attached patch allows plperl to return an arrayref
> where the function returns an array type. It silently calls a perl
> function to stringify the array before passing it to the pg array
> parser. Non-array returns are handled as before (i.e. passed through
> this process) so it is backwards compatible. I will presently submit
> regression tests and docs.
>
> example:
>
> andrew=# create or replace function blah() returns text[][] language
> plperl as $$ return [['a"b','c,d'],['e\\f','g']]; $$;
> CREATE FUNCTION
> andrew=# select blah();
>             blah
> -----------------------------
>  {{"a\"b","c,d"},{"e\\f",g}}
>
>
> This would complete half of the TODO item:
>
>   . Pass arrays natively instead of as text between plperl and postgres
>
> (The other half is translating pg array arguments to perl arrays - that
> will have to wait for 8.1).
>
> Some of this patch is adapted from a previously submitted patch from
> Sergej Sergeev. Both he and Abhijit Menon-Sen have looked it over
> briefly and tentatively said it looks ok.
>
> cheers
>
> andrew


>
> ---------------------------(end of broadcast)---------------------------
> TIP 9: In versions below 8.0, the planner will ignore your desire to
>        choose an index scan if your joining column's datatypes do not
>        match

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