Function exec_eval_boolean

src/pl/plpgsql/src/pl_exec.c:5591–5605

---------- * exec_eval_boolean Evaluate an expression, coerce result to bool * * Note we do not do exec_eval_cleanup here; the caller must do it at * some later point. * ---------- */

 * ----------
 */
static bool
exec_eval_boolean(PLpgSQL_execstate *estate,
				  PLpgSQL_expr *expr,
				  bool *isNull)
{
	Datum		exprdatum;
	Oid			exprtypeid;
	int32		exprtypmod;

	exprdatum = exec_eval_expr(estate, expr, isNull, &exprtypeid, &exprtypmod);
	exprdatum = exec_cast_value(estate, exprdatum, isNull,
								exprtypeid, exprtypmod,
								BOOLOID, -1);
	return DatumGetBool(exprdatum);
}

/* ----------
 * exec_eval_expr			Evaluate an expression and return