Code sample for the article "Feature engineering has a language problem"

flink_math.java

@Override
public Tuple5<Double, Double, Double, Double, Integer> merge(Tuple5<Double, Double, Double, Double, Integer> a, Tuple5<Double, Double, Double, Double, Integer> b) {
    return new Tuple5<>(
        a.f0,                                   // Open (min)
        Math.max(a.f1, b.f1),                   // High
        Math.min(a.f2, b.f2),                   // Low
        b.f3,                                   // Close (latest value)
        a.f4 + b.f4                             // Volume
    );
}