hcrosse commented on code in PR #1490:
URL: https://github.com/apache/arrow-go/pull/1490#discussion_r4528699988


##########
arrow/scalar/scalar.go:
##########
@@ -834,10 +845,32 @@ func MakeArrayFromScalar(sc Scalar, length int, mem 
memory.Allocator) (arrow.Arr
                memory.Set(data.Bytes(), c)
                return array.NewBoolean(length, data, nil, 0), nil
        case BinaryScalar:
-               if s.DataType().ID() == arrow.FIXED_SIZE_BINARY {
+               switch s.DataType().ID() {
+               case arrow.FIXED_SIZE_BINARY:
                        data := finishFixedWidth(s.Data())
                        defer data.Release()
                        return array.MakeFromData(data), nil
+               case arrow.BINARY_VIEW, arrow.STRING_VIEW:
+                       value := s.Data()
+                       if len(value) > math.MaxInt32 {

Review Comment:
   I moved the guard into `Binary.Validate`, keyed on the declared view type, 
so it covers `BinaryView`, `StringView` and plain `Binary` scalars with a view 
type. `MakeArrayFromScalar` now calls `Validate`.
   
   I kept a separate check in `FillFromScalar` because the compute path does 
not validate first and it cannot return an error. It now panics on a 2 GiB 
value, like the view builders, instead of writing a negative header size.
   
   The size tests map address space without committing memory, run only on 
Linux and macOS, and skip platforms with a 32 bit `int`.



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