Function check_float8_array

src/backend/utils/adt/float.c:2861–2875

 */

static float8 *
check_float8_array(ArrayType *transarray, const char *caller, int n)
{
	/*
	 * We expect the input to be an N-element float array; verify that. We
	 * don't need to use deconstruct_array() since the array data is just
	 * going to look like a C array of N float8 values.
	 */
	if (ARR_NDIM(transarray) != 1 ||
		ARR_DIMS(transarray)[0] != n ||
		ARR_HASNULL(transarray) ||
		ARR_ELEMTYPE(transarray) != FLOAT8OID)
		elog(ERROR, "%s: expected %d-element float8 array", caller, n);
	return (float8 *) ARR_DATA_PTR(transarray);
}

/*
 * float8_combine