Xiao Li created SPARK-15199:
-------------------------------

             Summary: Disallow Dropping Build-in Functions
                 Key: SPARK-15199
                 URL: https://issues.apache.org/jira/browse/SPARK-15199
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.0.0
            Reporter: Xiao Li


As Hive and the major RDBMS behaves, the built-in functions are not allowed to 
drop. In the current implementation, users can drop the built-in functions. 
However, after dropping the built-in functions, users are unable to add them 
back. 



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