jiangjiangtian opened a new pull request, #10768:
URL: https://github.com/apache/incubator-gluten/pull/10768
## What changes are proposed in this pull request?
Suppose the following SQL:
```SQL
SELECT * FROM
(SELECT xxx, explode(split(xxx)) FROM a JOIN b ON a.joinkey = b.joinkey)
GROUP BY joinkey
```
There may exist `FlushableAggregateTransformer` in the executed plan because
`GenerateExecTransformer` doesn't override method `outputPartitioning`, which
makes `FlushableHashAggregateRule` can't determine that the inputs have already
been distributed by aggregation keys. So we need to override
`outputPartitioning` in `GenerateExecTransformerBase`.
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