dwsmith1983 commented on issue #4836:
URL: 
https://github.com/apache/datafusion-comet/issues/4836#issuecomment-5637333251

   Spark has no GROUPS frame unit: the parser grammar only accepts `RANGE` and 
`ROWS`, and the catalyst jars for 4.1.3 and 4.2.0 define `RowFrame` and 
`RangeFrame` with no `GroupsFrame` class, so no Spark plan can reach the 
`WindowFrameUnits::Groups` guard in native/core/src/execution/planner.rs. There 
is nothing for Comet to fall back from or add here until Spark itself grows the 
feature. Suggest closing.
   


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