Function array_mean

methods/array_ops/src/pg_gp/array_ops.c:445–457

 */
PG_FUNCTION_INFO_V1(array_mean);
Datum
array_mean(PG_FUNCTION_ARGS){
    if (PG_ARGISNULL(0)) { PG_RETURN_NULL(); }

    ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);

    Datum res = General_Array_to_Element(v, Float8GetDatum(0), 0.0,
            element_sum, average_finalize);

    PG_FREE_IF_COPY(v, 0);

    return(res);
}

/*
 * This function returns sum of the array elements, typed float8.