presto-main/src/main/java/io/prestosql/operator/aggregation/minmaxby/KeyAndBlockPositionValueStateSerializer.java/KeyAndBlockPositionValueStateSerializer/KeyAndBlockPositionValueStateSerializer
class KeyAndBlockPositionValueStateSerializer:    KeyAndBlockPositionValueStateSerializer(Type firstType, Type secondType)
    {
        this.firstType = requireNonNull(firstType, "firstType is null");
        this.secondType = requireNonNull(secondType, "secondType is null");
    }