Function average_root_finalize

methods/array_ops/src/pg_gp/array_ops.c:1130–1142

}

static
inline
Datum
average_root_finalize(Datum elt,int size,Oid element_type){
    float8 value = datum_float8_cast(elt, element_type);
    if (size == 0) {
        return Float8GetDatum(0);
    } else if (size == 1) {
        return Float8GetDatum(0);
    } else {
        return Float8GetDatum(sqrt(value/((float8)size - 1)));
    }
}

/* -----------------------------------------------------------------------
 * Type cast functions