Github user DoingDone9 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/4926#discussion_r26103224
  
    --- 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 --
    
    Yes. Because the name of currentDB has been contained in returnInspector 
when init, and  the name will be getted from returnInspector  firstly in 
function "unwrap",So it is unnecessary that get the name again. 


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