Github user vkorukanti commented on the pull request:
https://github.com/apache/drill/pull/431#issuecomment-197423446
There are many functions in Drill which accept VARCHAR only and not
VAR16CHAR. Why not convert the Hive UDF return type to VARCHAR when the Hive
return type is String? That way we don't have to deal with many Drill UDFs that
don't accept VAR16CHAR as input yet. For now this case works fine, but the
output of Hive UDF is given as input to some other function (ex. LIKE), it wont
work we don't have an implementation of LIKE for VAR16Char input?
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