- 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
create or replace function a() returns record as $$ return (1); $$ language
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.
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