On Sun, May 8, 2011 at 8:01 AM, lee Richard <clipper.ken...@gmail.com> wrote: > Hi, > > I am reading the source code of fastpath to understand the internal of > fastpath. I can not understand how does it send result to the client, I hope > somebody can help me on this. > > I see it call it invoke the function in > > HandleFunctionRequest() > -> retval = FunctionCallInvoke(&fcinfo); > -> SendFunctionResult(retval, fcinfo.isnull, fip->rettype, rformat); > ->OidOutputFunctionCall() > -> OutputFunctionCall() > -> result = > DatumGetCString(FunctionCall1(flinfo, val)); > -> result = > FunctionCallInvoke(&fcinfo); > > but I can not see in where it send the tuples to the client, instead it > invoke FunctionCallInvoke again. Can anyone tell me how it copy the tuples > and send it to the client.
It can't: the fastpath function can only return a scalar. See the client side docs. The whole system is a kludge more or less. merlin -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
