Rich-T-kid opened a new pull request, #23280:
URL: https://github.com/apache/datafusion/pull/23280
## Which issue does this PR close?
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works towards #22682.
## Rationale for this change
There is a lack of testing for multi-dictionary group bys. It make sense to
introduce these test before the implementation of `Dict<K,V>` in #23187
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## What changes are included in this PR?
introduces a couple test
- grouping by `Dict<_,largeutf8>`
- mixing grouping by dictionarys and non dictionary columns
- a 3-way group by where each column is `dict<_,_>
- all of these test also have nulls sprinkled in to verify null handling
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## Are these changes tested?
the changes are test.
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## Are there any user-facing changes?
no
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