andygrove commented on PR #2772:
URL: 
https://github.com/apache/datafusion-comet/pull/2772#issuecomment-3887516023

   Thanks for marking the expression as incompatible @Shekharrajak. You will 
need to enable the corresponding dynamic 
`spark.comet.expression.StringSplit.allowIncompatible=true` config in the tests 
now to fix the test failures:
   
   ```
   - split string basic *** FAILED *** (266 milliseconds)
     Expected only Comet native operators, but found Project.
     plan:  Project [COMET: split(_1#90062, ,, -1) is not fully compatible with 
Spark (Regex engine differences between Java and Rust). To enable it anyway, 
set spark.comet.expression.StringSplit.allowIncompatible=true. For more 
information, refer to the Comet Compatibility Guide 
(https://datafusion.apache.org/comet/user-guide/compatibility.html).]
     +- CometColumnarToRow
        +- CometScan [native_iceberg_compat] parquet 
   ```


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