Re: pl/pgsql and arrays[]

2011/12/5 Maxim Boguk <maxim(dot)boguk(at)gmail(dot)com>:
>
>
> On Mon, Dec 5, 2011 at 3:53 PM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
> wrote:
>>
>> Hello
>>
>> it work on my pc
>>
>> postgres=# \sf fx
>> CREATE OR REPLACE FUNCTION public.fx()
>>  RETURNS SETOF integer
>>  LANGUAGE plpgsql
>> AS $function$ declare g int[] = '{20}';
>> begin
>>  return next g[1];
>>  return;
>> end;
>> $function$
>> postgres=# select fx();
>>  fx
>> ----
>>  20
>> (1 row)
>>
>> regards
>>
>> Pavel Stehule
>
>
> Oh sorry.
> Seems I didn't tested simple cases.
>

return next in function that returns composite type needs a composite
variable. Other cases are not supported there.

Regards

Pavel Stehule

> Error happened when you work with record[] types and return setof:
>
> create table test (id serial);
> insert into test select generate_series(1,10);
>
> CREATE OR REPLACE FUNCTION _test_array()
> RETURNS SETOF test
> LANGUAGE plpgsql
> AS $$
> DECLARE
>     _array test[];
>     _row   test%ROWTYPE;
> BEGIN
>      SELECT array(SELECT test FROM test) INTO _array;
>
>      --work
>      --_row := _array[1];
>      --RETURN NEXT _row;
>
>      --also work
>      --RETURN QUERY SELECT (_array[1]).*;
>
>      --error
>      --RETURN NEXT _array[1];
>
>      --error
>      --RETURN NEXT (_array[1]);
>
>      --error
>      --RETURN NEXT (_array[1]).*;
>
>      RETURN;
> END;
> $$;
>
>
>
>
>>
>>
>> 2011/12/5 Maxim Boguk <maxim(dot)boguk(at)gmail(dot)com>:
>> > Some quetions about pl/pgsql and arrays[].
>> >
>> > Is such constructions as:
>> >
>> > RETURN NEXT array[1];
>> >
>> > OR
>> >
>> > SELECT val INTO array[1] FROM ...;
>> >
>> > Should not work?
>> >
>> > At least documentation about RETURN NEXT  says:
>> > "RETURN NEXT expression;"
>> >
>> > I think array[1] is a valid expression.
>> >
>> > --
>> > Maxim Boguk
>> > Senior Postgresql DBA.
>
>
>
>
> --
> Maxim Boguk
> Senior Postgresql DBA.
>
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>
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>
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>
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