[jira] [Created] (TAJO-679) TimestampDatum, TimeDatum, DateDatum should be able to be compared with NullDatum

[Jihoon Son (JIRA)]

Jihoon Son created TAJO-679:
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             Summary: TimestampDatum, TimeDatum, DateDatum should be able to be 
compared with NullDatum
                 Key: TAJO-679
                 URL: https://issues.apache.org/jira/browse/TAJO-679
             Project: Tajo
          Issue Type: Bug
            Reporter: Jihoon Son
             Fix For: 0.8-incubating


See the title.
Currently, InvalidOperationException occurs when the above datums are compared 
with NullDatum. Instead, the 'false' should be returned.



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