Tom,
Thanks a lot.
The part I cant understand is I cant see where SendFunctionResult construct the return value into the buf. I expect it should copy something in retval to buf, but I cant find any of this in the code, the main logic of SendFunctionResult is:
00159 getTypeOutputInfo(rettype, &typoutput, &typisvarlena);
00160 outputstr = OidOutputFunctionCall(typoutput, retval);
00161 pq_sendcountedtext(&buf, outputstr, strlen(outputstr), false);
00162 pfree(outputstr);
I think it should copy the real result in OidOutputFunctionCall, but unfortunately I can only find it call FunctionCall1() again. Do I miss something?
If I copy the tuples returnned from pl module here, is it possible to send a vector result from fastpath function call?
2011/5/9 Tom Lane
<tgl@sss.pgh.pa.us>lee Richard <
clipper.kenyon@gmail.com> writes:
> I still can not see how it return a single return value to the client, and
> why it call FunctionCall1() again when it want to send the result.
if that's what you're looking for. The rest of the activity in
SendFunctionResult is just concerned with constructing the message to be
sent within "buf".
regards, tom lane
