Re: return can contains any row or record functions

Has any more work happened on this patch?

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Pavel Stehule wrote:
>
> >- we can't use estate->rsi for the RETURN case, at least as presently
> >implemented, because that is not always filled-out -- the example I gave
> >before shows how because we don't check for a compatible TupleDesc when
> >estate->rsi is NULL, we end up returning a value that is incompatible
> >with the function's declared return type
>
> I expected so when rsi is NULL, then I haven't any info about desired record
> type, and then I have to skip checking for a compatibility (and I can it to
> do, because this is clean error, then is not necessery conversion, and next
> step do exception and error if returned type is wrong).
>
> I found different problem. It has maybe relation with Tom Lane's changes
> about returning one field records. And maybe wee need test for conversion
> everytime
>
> create or replace function a() returns record as $$ return (1); $$ language
> plpgsql;
>
> is syntax clean, it's row expression, but select a() ends with wrong result
> type supplied in RETURN. With change return (1,2), all works fine. return
> row(1) works well too.
>
> >
> >- therefore, we need to use some other way to get the TupleDesc of the
> >function's declared return type. Offhand I think we can use
> >estate->fn_rettype (plus the funcapi stuff for handling RECORDOID), but
> >I haven't had a chance to try it yet.
> >
>
> testing estate->fn_rettype is safer, but what is efectivity? Is necessery
> caching TupleDesc in retturn statement? I don't know? I don't study
> mechanism when is rsi valid or not. But I found some samples in source, when
> rsi was used for same purpose.
>
> Pavel
>
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