andygrove commented on PR #6726:
URL: 
https://github.com/apache/datafusion-comet/pull/6726#issuecomment-6805899356

   Thanks @viirya and @comphead. `CometInMemoryCacheSuite` now expects a 
conversion for `array of int`. Neither of the two replacements suggested worked 
as the case that stays on Spark's transition. `RowToColumnarExec` itself throws 
`UNSUPPORTED_DATATYPE` for a collated string and for `NullType`, and a day-time 
interval gets no transition at all, because the cache serializer has no arm for 
it. An empty struct is the case that works: the serializer takes it, Spark's 
transition converts it, and the conversion still declines it. I merged `main` 
(35a2d3bd38) and `CometInMemoryCacheSuite`, `CometShuffleInputConversionSuite` 
and the `SparkToColumnar` tests in `CometExecSuite` pass on Spark 4.1. 
`test-compile -Pspark-3.5 -Pstrict-warnings` passes too.


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