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Posted to github@arrow.apache.org by "Jefffrey (via GitHub)" <gi...@apache.org> on 2025/11/14 06:27:30 UTC
[I] Cannot cast string dictionary to binary view [arrow-rs]
Jefffrey opened a new issue, #8841:
URL: https://github.com/apache/arrow-rs/issues/8841
**Describe the bug**
<!--
A clear and concise description of what the bug is.
-->
When casting a dictionary with string value to binary view, run into an unexpected error.
**To Reproduce**
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Steps to reproduce the behavior:
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This test should pass:
```rust
// arrow-cast/src/cast/mod.rs
#[test]
fn test_string_dict_to_binary_view() {
let values = StringArray::from_iter(VIEW_TEST_DATA);
let keys = Int8Array::from_iter([Some(1), Some(0), None, Some(3), None, Some(1), Some(4)]);
let string_dict_array =
DictionaryArray::<Int8Type>::try_new(keys, Arc::new(values)).unwrap();
let casted = cast(&string_dict_array, &DataType::BinaryView).unwrap();
assert_eq!(casted.data_type(), &DataType::BinaryView);
}
```
Currently failing:
```sh
thread 'cast::tests::test_string_dict_to_binary_view' (4994586) panicked at arrow-cast/src/cast/mod.rs:6651:70:
called `Result::unwrap()` on an `Err` value: ComputeError("Internal Error: Cannot cast BinaryView to BinaryArray of expected type")
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
test cast::tests::test_string_dict_to_binary_view ... FAILED
```
**Expected behavior**
<!--
A clear and concise description of what you expected to happen.
-->
Should successfully cast to a binary view.
**Additional context**
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Add any other context about the problem here.
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Discovered in DataFusion: https://github.com/apache/datafusion/pull/18662#discussion_r2525927446
Related code is here:
https://github.com/apache/arrow-rs/blob/2bc269c3eec23f6794fcd793b641ea4c08325d54/arrow-cast/src/cast/dictionary.rs#L107-L125
- It's likely the same will happen for vice-versa situation, i.e. binary dictionary to string view (see above arm)
Related PR: #5871
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Re: [I] Cannot cast string dictionary to binary view [arrow-rs]
Posted by "alamb (via GitHub)" <gi...@apache.org>.
alamb commented on issue #8841:
URL: https://github.com/apache/arrow-rs/issues/8841#issuecomment-3716624133
`label_issue.py` automatically added labels {'arrow'} from #8912
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Re: [I] Cannot cast string dictionary to binary view [arrow-rs]
Posted by "Jefffrey (via GitHub)" <gi...@apache.org>.
Jefffrey commented on issue #8841:
URL: https://github.com/apache/arrow-rs/issues/8841#issuecomment-3531097650
If I comment out the `BinaryView` arm in the related code, the test passes successfully.
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Re: [I] Cannot cast string dictionary to binary view [arrow-rs]
Posted by "Jefffrey (via GitHub)" <gi...@apache.org>.
Jefffrey closed issue #8841: Cannot cast string dictionary to binary view
URL: https://github.com/apache/arrow-rs/issues/8841
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