hyoungjunkim created TAJO-760:
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             Summary: (Umbrella)Time related function
                 Key: TAJO-760
                 URL: https://issues.apache.org/jira/browse/TAJO-760
             Project: Tajo
          Issue Type: Improvement
            Reporter: hyoungjunkim


Most ETL program uses date/time function like now(), add_month(). For this Tajo 
should support Interval type. In addition, we need to create a lot of 
functions. Actually there is some non-standard function and many user uses that 
function. So I propose implementing all standard function and some of wildly 
used non-standard function..
This is a umbrella issue. I'll create various subtasks. 



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