Function exec_cast_value

src/pl/plpgsql/src/pl_exec.c:7647–7665

---------- * exec_cast_value Cast a value if required * * Note that *isnull is an input and also an output parameter. While it's * unlikely that a cast operation would produce null from non-null or vice * versa, that could happen in principle. * * Note: the estate's eval_mcontext is used for temporary storage, and may * also contain the result Datum if we have to do a conversion to a pa

 * ----------
 */
static inline Datum
exec_cast_value(PLpgSQL_execstate *estate,
				Datum value, bool *isnull,
				Oid valtype, int32 valtypmod,
				Oid reqtype, int32 reqtypmod)
{
	/*
	 * If the type of the given value isn't what's requested, convert it.
	 */
	if (valtype != reqtype ||
		(valtypmod != reqtypmod && reqtypmod != -1))
	{
		/* We keep the slow path out-of-line. */
		value = do_cast_value(estate, value, isnull, valtype, valtypmod,
							  reqtype, reqtypmod);
	}

	return value;
}

/* ----------
 * do_cast_value			Slow path for exec_cast_value.