[jira] [Created] (HIVE-18304) datediff() UDF returns a wrong result when dealing with a (date, string) input

["Hengyu Dai (JIRA)" <ji...@apache.org>]

Hengyu Dai created HIVE-18304:
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             Summary: datediff() UDF returns a wrong result when dealing with a (date, string) input
                 Key: HIVE-18304
                 URL: https://issues.apache.org/jira/browse/HIVE-18304
             Project: Hive
          Issue Type: Bug
          Components: UDF
            Reporter: Hengyu Dai
            Priority: Minor


for date type argument, datediff() use DateConverter to convert input to a java Date object, 
for example, a '2017-12-18' will get 2017-12-18T00:00:00.000+0800
for string type argument, datediff() use TextConverter to convert a string to date,
for '2012-01-01' we will get 2012-01-01T08:00:00.000+0800
now, datediff() will return a number less than the real date diff

reproduce:
{code:java}
select datediff(cast('2017-12-18' as date), '2012-01-01'); --2177

select datediff('2017-12-18', '2012-01-01'); --2178
{code}




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