[I] unsupported cast to string_view from utf8 in v18 [arrow-go]

[via GitHub]

fwojciec opened a new issue, #184:
URL: https://github.com/apache/arrow-go/issues/184

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   Casting between string <-> string_view types has been added in C++ and 
Python implementations of arrow in v18: 
https://github.com/apache/arrow/pull/43302
   
   I tested this in Python and it works with the latest (18.0.0) pyarrow 
release:
   
   ```python
   [ins] In [1]: import pyarrow as pa
   
   [ins] In [2]: import pyarrow.compute as pc
   
   [ins] In [3]: a = pa.array(["one", "two", "three"])
   
   [ins] In [4]: a
   Out[4]: 
   <pyarrow.lib.StringArray object at 0x111e3b340>
   [
     "one",
     "two",
     "three"
   ]
   
   [ins] In [5]: a.cast(pa.string_view())
   Out[5]: 
   <pyarrow.lib.StringViewArray object at 0x111a3be80>
   [
     "one",
     "two",
     "three"
   ]
   ```
   
   It doesn't work with the v18 release of arrow-go:
   
   ```go
   package main
   
   import (
        "context"
        "fmt"
   
        "github.com/apache/arrow-go/v18/arrow"
        "github.com/apache/arrow-go/v18/arrow/array"
        "github.com/apache/arrow-go/v18/arrow/compute"
        "github.com/apache/arrow-go/v18/arrow/memory"
   )
   
   func main() {
        alloc := memory.NewGoAllocator()
        b := array.NewStringBuilder(alloc)
        defer b.Release()
        b.AppendValues([]string{"a", "b", "c"}, nil)
        arr := b.NewArray()
        fmt.Println(arr)
   
        newArr, err := compute.CastArray(context.Background(), arr, 
&compute.CastOptions{
                ToType: arrow.BinaryTypes.StringView,
        })
        if err != nil {
                panic(err)
        }
        fmt.Println(newArr)
   }
   
   // Output:
   // ["a" "b" "c"]
   // panic: not implemented: unsupported cast to string_view from utf8
   // ...
   // exit status 2
   ```
   
   I'd be happy to work on the PR to add it if someone can give me a pointer 
with description of what would it take - high-level - to add support for this 
in Go.
   
   ### Component(s)
   
   Release


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