hermanschaaf opened a new issue, #34959:
URL: https://github.com/apache/arrow/issues/34959
### Describe the enhancement requested
Right now it seems like there is support for casting from extension types to
their underlying storage types, but not vice versa.
The `cast_test.go` tests include these cases, for example:
```
canCast(types.NewSmallintType(),
[]arrow.DataType{arrow.PrimitiveTypes.Int16})
canCast(types.NewSmallintType(), numericTypes)
// any cast which is valid for storage is supported
canCast(arrow.Null, []arrow.DataType{types.NewSmallintType()})
```
But adding this case, from the storage type to the extension type, fails:
```
canCast(arrow.PrimitiveTypes.Int16,
[]arrow.DataType{types.NewSmallintType()}) // casting from storage type to
extension is supported
```
```
=== RUN TestCasts/TestCanCast
cast_test.go:335:
Error Trace:
/Users/hermanschaaf/code/cloudquery/arrow/go/arrow/compute/cast_test.go:335
/Users/hermanschaaf/code/cloudquery/arrow/go/arrow/compute/cast_test.go:341
/Users/hermanschaaf/code/cloudquery/arrow/go/arrow/compute/cast_test.go:401
Error: Not equal:
expected: true
actual : false
Test: TestCasts/TestCanCast
Messages: CanCast from: int16, to:
extension_type<storage=int16>, expected: true
```
It seems like this should be possible, as long as the type being cast from
matches the storage type. Is there another way to do this that I might be
missing?
### Component(s)
Go
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