Function postquel_getnext

src/backend/executor/functions.c:1007–1039

Run one execution_state; either to completion or to first result row */ Returns true if we ran to completion */

/* Run one execution_state; either to completion or to first result row */
/* Returns true if we ran to completion */
static bool
postquel_getnext(execution_state *es, SQLFunctionCachePtr fcache)
{
	bool		result;

	if (es->qd->operation == CMD_UTILITY)
	{
		ProcessUtility(es->qd->plannedstmt,
					   fcache->src,
					   false,
					   PROCESS_UTILITY_QUERY,
					   es->qd->params,
					   es->qd->queryEnv,
					   es->qd->dest,
					   NULL);
		result = true;			/* never stops early */
	}
	else
	{
		/* Run regular commands to completion unless lazyEval */
		uint64		count = (es->lazyEval) ? 1 : 0;

		ExecutorRun(es->qd, ForwardScanDirection, count, !fcache->returnsSet || !es->lazyEval);

		/*
		 * If we requested run to completion OR there was no tuple returned,
		 * command must be complete.
		 */
		result = (count == 0 || es->qd->estate->es_processed == 0);
	}

	return result;
}

/* Shut down execution of one execution_state node */
static void