pitrou opened a new pull request #8811:
URL: https://github.com/apache/arrow/pull/8811
* Add an ipc::IpcWriteOptions member to govern emission of dictionary deltas.
If the option is enabled, deltas are detected by checking whether the new
dictionary starts with the last emitted one for the same field.
However, for nested dictionaries, deltas are not emitted for the outer
dictionary,
as the read path doesn't support it.
* Add a stats() method to ipc::StreamDecoder
* Expose the IPC statistics in Python, and add tests
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