beliefer opened a new pull request, #36325:
URL: https://github.com/apache/spark/pull/36325
### What changes were proposed in this pull request?
Currently, Spark DS V2 aggregate push-down only supports group by column.
But the SQL show below is very useful and common.
```
SELECT CASE
WHEN 'SALARY' > 8000.00
AND 'SALARY' < 10000.00
THEN 'SALARY'
ELSE 0.00
END AS key, SUM('SALARY')
FROM "test"."employee"
GROUP BY key
```
### Why are the changes needed?
Let DS V2 aggregate push-down supports group by expressions
### Does this PR introduce _any_ user-facing change?
'No'.
New feature.
### How was this patch tested?
New tests
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