[BUG] Queries with window expressions fail when cost-based optimizer is enabled

[andygrove]

Describe the bug

With the RAPIDS Accelerator cost-based optimizer enabled, queries with window expressions fail when we attempt to estimate data sizes, because WindowFrame.dataType throws UnsupportedOperationException.

[2021-05-22T11:55:11.887Z] java.lang.UnsupportedOperationException: dataType^M
[2021-05-22T11:55:11.887Z]      at org.apache.****.sql.catalyst.expressions.WindowFrame.dataType(windowExpressions.scala:168)^M
[2021-05-22T11:55:11.887Z]      at org.apache.****.sql.catalyst.expressions.WindowFrame.dataType$(windowExpressions.scala:168)^M
[2021-05-22T11:55:11.887Z]      at org.apache.****.sql.catalyst.expressions.SpecifiedWindowFrame.dataType(windowExpressions.scala:179)^M
[2021-05-22T11:55:11.887Z]      at com.nvidia.****.rapids.BaseExprMeta.dataType(RapidsMeta.scala:758)^M
[2021-05-22T11:55:11.887Z]      at com.nvidia.****.rapids.CpuCostModel.exprCost(CostBasedOptimizer.scala:282)^M

Steps/Code to reproduce bug
Run NDS query q89 with CBO enabled.

Expected behavior
Query should not fail.

Environment details (please complete the following information)
N/A

Additional context
None

[revans2]

Ya there is some oddness with data type for a WindowSpecDefinition. For what ever reason they throw nsupportedOperationException("dataType"), so we probably need to have some special case code for them like we have here.