andygrove opened a new issue, #4005:
URL: https://github.com/apache/datafusion-comet/issues/4005
### What is the problem the feature request solves?
Comet currently eagerly tries to convert each operator to a Comet operator.
This sometimes leads to inefficient plans that can be slower than just falling
back to Spark.
One example is where a Comet JVM shuffle is inserted for a child plan that
runs in Spark, to convert to columner shuffle, and then the next stage converts
back to row-based right away.
```
+- HashAggregate
+- CometNativeColumnarToRow
+- CometColumnarExchange
+- HashAggregate
```
Another example we saw recently was with DPP fallback, and there was a fix
applied for that specific case.
Document to discuss:
https://docs.google.com/document/d/1ux_SwZPd64VTtuTC9lC46oIZGKcoH6KhWOS8xlqwdx8/edit?usp=sharing
### Describe the potential solution
_No response_
### Additional context
_No response_
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