[I] [native_datafusion] [Spark SQL Tests] Streaming self-union returns no results [datafusion-comet]

["andygrove (via GitHub)" <gi...@apache.org>]

andygrove opened a new issue, #3401:
URL: https://github.com/apache/datafusion-comet/issues/3401

   ## Description
   
   When running Spark SQL tests with `native_datafusion` scan enabled, two streaming self-union tests in `StreamingSelfUnionSuite` fail because the streaming query result is `None` instead of containing the expected data.
   
   ## Failing Tests
   
   - `self-union, DSv1, read via DataStreamReader API`
   - `self-union, DSv1, read via table API`
   
   ## Error
   
   ```
   Assert on query failed: : None was empty
   ```
   
   ## Context
   
   Found during CI run: https://github.com/apache/datafusion-comet/actions/runs/21691646806/job/62552819424?pr=3393


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