Function BlessTupleDesc

src/backend/executor/execTuples.c:2087–2095

* BlessTupleDesc - make a completed tuple descriptor useful for SRFs * * Rowtype Datums returned by a function must contain valid type information. * This happens "for free" if the tupdesc came from a relcache entry, but * not if we have manufactured a tupdesc for a transient RECORD datatype. * In that case we have to notify typcache.c of the existence of the type. */

 * In that case we have to notify typcache.c of the existence of the type.
 */
TupleDesc
BlessTupleDesc(TupleDesc tupdesc)
{
	if (tupdesc->tdtypeid == RECORDOID &&
		tupdesc->tdtypmod < 0)
		assign_record_type_typmod(tupdesc);

	return tupdesc;				/* just for notational convenience */
}

/*
 * TupleDescGetAttInMetadata - Build an AttInMetadata structure based on the