andygrove opened a new issue, #2880:
URL: https://github.com/apache/datafusion-comet/issues/2880
### What is the problem the feature request solves?
The golden file at
`spark/src/test/resources/tpcds-plan-stability/approved-plans-v1_4-spark3_5/q1.native_datafusion/extended.txt`
has this section:
```
: : : +- HashAggregate
: : : +- CometColumnarToRow
: : : +- CometColumnarExchange
: : : +- HashAggregate
```
Presumably the first `HashAggregate` shown here is not supported by Comet
(fallback reasons are missing for some reason) so this query stage needs to
call `CometColumnarToRow`.
There is _probably_ no benefit in using columnar shuffle in the child stage
if the parent stage immediately converts back to row-based, although we should
confirm that assumption.
### Describe the potential solution
### Additional context
_No response_
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