Hi, I have been working on building gandiva expression trees with the InExpression. I was able to get it working with all types except the date/time types. It seems that if the input node into `MakeInExpressionTimeStamp` has a return type of Timestamp then validation throws an error because Timestamp is not an int64. There doesn't appear to be a way to extract the raw int64 millies from a timestamp node. castBIGINT doesn't seem to exist for the timestamp type.
I tried looking for examples in the gandiva tests but there do not seem to be any tests which exercise the date/time InExpressions. If I am not missing something and this is actually a bug I don't mind filing it and working on it myself with maybe a little direction for the best way to fix it. Thanks, -nate
