Dongjoon Hyun created SPARK-14614:
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             Summary: Add `bound` function
                 Key: SPARK-14614
                 URL: https://issues.apache.org/jira/browse/SPARK-14614
             Project: Spark
          Issue Type: Improvement
          Components: SQL
            Reporter: Dongjoon Hyun


This issue aims to add `bound` function (aka Banker's round) by extending 
current `round` implementation.

Hive supports `bround` since 1.3.0. [Language 
Manual|https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF].

{code}
hive> select round(2.5), bround(2.5);
OK
3.0     2.0
{code}



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