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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/03/04 01:36:55 UTC
[GitHub] [arrow-rs] sunchao opened a new issue #1397: Support dictionary array in C data interface
sunchao opened a new issue #1397:
URL: https://github.com/apache/arrow-rs/issues/1397
**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
Currently it seems the Arrow FFI interface doesn't support dictionary yet. Even though the [field exists](https://github.com/apache/arrow-rs/blob/master/arrow/src/ffi.rs#L328) in `FFI_ArrowArray`, it is never assigned or used.
Unlike the C++ implementation, `ArrayData` doesn't have a dictionary field either.
**Describe the solution you'd like**
I haven't looked closely, but I think roughly we should have dictionary in `ArrayData` first? after that exporting it via the FFI will be straightforward.
**Describe alternatives you've considered**
N/A
**Additional context**
N/A
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[GitHub] [arrow-rs] sunchao commented on issue #1397: Support dictionary array in C data interface
Posted by GitBox <gi...@apache.org>.
sunchao commented on issue #1397:
URL: https://github.com/apache/arrow-rs/issues/1397#issuecomment-1058748778
[`DictionaryArray`](https://github.com/apache/arrow-rs/blob/master/arrow/src/array/array_dictionary.rs) also needs change as it is currently not C data interface compatible - when exporting to `ArrayData` it needs to populate the dictionary field in the output.
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[GitHub] [arrow-rs] sunchao closed issue #1397: Support dictionary array in C data interface
Posted by GitBox <gi...@apache.org>.
sunchao closed issue #1397:
URL: https://github.com/apache/arrow-rs/issues/1397
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