Zoltan Chovan created HIVE-15792:

             Summary: Hive should raise SemanticException when LPAD/RPAD pad 
character's length is 0
                 Key: HIVE-15792
                 URL: https://issues.apache.org/jira/browse/HIVE-15792
             Project: Hive
          Issue Type: Bug
            Reporter: Zoltan Chovan
            Priority: Minor

For example SELECT LPAD('A', 2, ''); will cause an infinite loop and the 
running query will hang without any error.

It would be great if this could be prevented by checking the pad character's 
length and if it's 0 then throw a SemanticException.

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