func Hash()

in arrow/scalar/scalar.go [727:799]
68 lines of code
23 McCabe index (conditional complexity)

func Hash(seed maphash.Seed, s Scalar) uint64 {
	var h maphash.Hash
	h.SetSeed(seed)
	binary.Write(&h, endian.Native, arrow.HashType(seed, s.DataType()))

	out := h.Sum64()
	if !s.IsValid() {
		return out
	}

	hash := func() {
		out ^= h.Sum64()
		h.Reset()
	}

	valueHash := func(v interface{}) uint64 {
		switch v := v.(type) {
		case int32:
			h.Write((*[4]byte)(unsafe.Pointer(&v))[:])
		case int64:
			h.Write((*[8]byte)(unsafe.Pointer(&v))[:])
		case arrow.Date32:
			binary.Write(&h, endian.Native, uint32(v))
		case arrow.Time32:
			binary.Write(&h, endian.Native, uint32(v))
		case arrow.MonthInterval:
			binary.Write(&h, endian.Native, uint32(v))
		case arrow.Duration:
			binary.Write(&h, endian.Native, uint64(v))
		case arrow.Date64:
			binary.Write(&h, endian.Native, uint64(v))
		case arrow.Time64:
			binary.Write(&h, endian.Native, uint64(v))
		case arrow.Timestamp:
			binary.Write(&h, endian.Native, uint64(v))
		case float16.Num:
			binary.Write(&h, endian.Native, v.Uint16())
		case decimal128.Num:
			binary.Write(&h, endian.Native, v.LowBits())
			hash()
			binary.Write(&h, endian.Native, uint64(v.HighBits()))
		}
		hash()
		return out
	}

	h.Reset()
	switch s := s.(type) {
	case *Null:
	case *Extension:
		out ^= Hash(seed, s.Value)
	case *DayTimeInterval:
		return valueHash(s.Value.Days) & valueHash(s.Value.Milliseconds)
	case *MonthDayNanoInterval:
		return valueHash(s.Value.Months) & valueHash(s.Value.Days) & valueHash(s.Value.Nanoseconds)
	case PrimitiveScalar:
		h.Write(s.Data())
		hash()
	case TemporalScalar:
		return valueHash(s.value())
	case ListScalar:
		array.Hash(&h, s.GetList().Data())
		hash()
	case *Struct:
		for _, c := range s.Value {
			if c.IsValid() {
				out ^= Hash(seed, c)
			}
		}
	}

	return out
}