zeroshade commented on code in PR #35769:
URL: https://github.com/apache/arrow/pull/35769#discussion_r1391703078
##########
go/arrow/array/binary.go:
##########
@@ -318,6 +319,126 @@ func arrayEqualLargeBinary(left, right *LargeBinary) bool
{
return true
}
+type ViewLike interface {
+ arrow.Array
+ ValueHeader(int) *arrow.ViewHeader
+}
+
+type BinaryView struct {
+ array
+ values []arrow.ViewHeader
+ dataBuffers []*memory.Buffer
+}
+
+func NewBinaryViewData(data arrow.ArrayData) *BinaryView {
+ a := &BinaryView{}
+ a.refCount = 1
+ a.setData(data.(*Data))
+ return a
+}
+
+func (a *BinaryView) setData(data *Data) {
+ if len(data.buffers) < 2 {
+ panic("len(data.buffers) < 2")
+ }
+ a.array.setData(data)
+
+ if valueData := data.buffers[1]; valueData != nil {
+ a.values =
arrow.ViewHeaderTraits.CastFromBytes(valueData.Bytes())
+ }
+
+ a.dataBuffers = data.buffers[2:]
+}
+
+func (a *BinaryView) ValueHeader(i int) *arrow.ViewHeader {
+ if i < 0 || i >= a.array.data.length {
+ panic("arrow/array: index out of range")
+ }
+ return &a.values[a.array.data.offset+i]
+}
+
+func (a *BinaryView) Value(i int) []byte {
+ s := a.ValueHeader(i)
+ if s.IsInline() {
+ return s.InlineBytes()
+ }
+ start := s.BufferOffset()
+ buf := a.dataBuffers[s.BufferIndex()]
+ return buf.Bytes()[start : start+int32(s.Len())]
+}
+
+// ValueString returns the value at index i as a string instead of
+// a byte slice, without copying the underlying data.
+func (a *BinaryView) ValueString(i int) string {
+ b := a.Value(i)
+ return *(*string)(unsafe.Pointer(&b))
+}
+
+func (a *BinaryView) String() string {
+ var o strings.Builder
+ o.WriteString("[")
+ for i := 0; i < a.Len(); i++ {
+ if i > 0 {
+ o.WriteString(" ")
+ }
+ switch {
+ case a.IsNull(i):
+ o.WriteString(NullValueStr)
+ default:
+ fmt.Fprintf(&o, "%q", a.ValueString(i))
+ }
+ }
+ o.WriteString("]")
+ return o.String()
+}
+
+// ValueStr is paired with AppendValueFromString in that it returns
+// the value at index i as a string: Semantically this means that for
+// a null value it will return the string "(null)", otherwise it will
+// return the value as a base64 encoded string suitable for CSV/JSON.
+//
+// This is always going to be less performant than just using ValueString
+// and exists to fulfill the Array interface to provide a method which
+// can produce a human readable string for a given index.
+func (a *BinaryView) ValueStr(i int) string {
Review Comment:
added
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