Dandandan commented on issue #821:
URL:
https://github.com/apache/arrow-datafusion/issues/821#issuecomment-892104898
The error message could be improved.
I think it's trying to hash the dictionaries `bucket_id` and `partition_id`
which misses.an implementation.
There is a PR over here from @alamb to support this.
https://github.com/apache/arrow-datafusion/pull/812
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