[FEA] Implement KnownNotNull on the GPU

[sameerz]

Is your feature request related to a problem? Please describe.
Implement KnownNotNull on GPU

Describe the solution you'd like
When KnownNotNull is part of the plan, the plan stays on the GPU

Describe alternatives you've considered
N/A

Additional context

[firestarman]

@sameerz May I know the case/sql for this KnownNotNull ? Since I need a test case for it.

[revans2]

KnownNotNull is used by Spark to tag an expression as known to not be null. A customer asked for this and we do not completely know the use case for it. I looked at the code for Spark 3.0.2, you probably want to check newer versions to see if there are other cases, but it appears to only be used with UDFs and in a few cases with conversions from a data set to data frames.

Essentially it is for a scala/java UDF that takes a primitive type as input, something that cannot be nullable. Then Spark inserts other processing around the UDF so it would never be called with a null. This is probably related to the native UDF stuff that @jlowe did, and is the only way I can think of that we would hit something like this in practice.

[firestarman]

I tried several cases and got this expression in logical plan, but it will be removed after optimization.
I will check the the native UDF.