coderfender opened a new issue, #4445:
URL: https://github.com/apache/datafusion-comet/issues/4445
### Describe the bug
`Utils.serializeBatches` and `Utils.coalesceBroadcastBatches` lose the row
count when the input batch has zero columns, so a column-pruned broadcast
relation arrives at the receiver as empty.
### Steps to reproduce
_No response_
### Expected behavior
_No response_
### Additional context
_No response_
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