Github user chenghao-intel commented on a diff in the pull request:

    https://github.com/apache/spark/pull/4926#discussion_r26041674
  
    --- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/hiveUdfs.scala 
---
    @@ -179,7 +179,12 @@ private[hive] case class HiveGenericUdf(funcWrapper: 
HiveFunctionWrapper, childr
             })
           i += 1
         }
    -    unwrap(function.evaluate(deferedObjects), returnInspector)
    +    
    +    if (function.getUdfName().endsWith("UDFCurrentDB")) {
    --- End diff --
    
    Can you explain why you think returning a `null` is more reasonable than 
executing the `UDFCurrentDB`?  Seems it will not throws exception anymore in 
Hive 0.14: 
http://grepcode.com/file/repo1.maven.org/maven2/org.apache.hive/hive-exec/0.14.0/org/apache/hadoop/hive/ql/udf/generic/UDFCurrentDB.java/


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