Function instantiate_empty_record_variable

src/pl/plpgsql/src/pl_exec.c:7583–7601

* If we have not created an expanded record to hold the record variable's * value, do so. The expanded record will be "empty", so this does not * change the logical state of the record variable: it's still NULL. * However, now we'll have a tupdesc with which we can e.g. look up fields. */

 * However, now we'll have a tupdesc with which we can e.g. look up fields.
 */
static void
instantiate_empty_record_variable(PLpgSQL_execstate *estate, PLpgSQL_rec *rec)
{
	Assert(rec->erh == NULL);	/* else caller error */

	/* If declared type is RECORD, we can't instantiate */
	if (rec->rectypeid == RECORDOID)
		ereport(ERROR,
				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
				 errmsg("record \"%s\" is not assigned yet", rec->refname),
				 errdetail("The tuple structure of a not-yet-assigned record is indeterminate.")));

	/* Make sure rec->rectypeid is up-to-date before using it */
	revalidate_rectypeid(rec);

	/* OK, do it */
	rec->erh = make_expanded_record_from_typeid(rec->rectypeid, -1,
												estate->datum_context);
}

/* ----------
 * convert_value_to_string			Convert a non-null Datum to C string