[jira] [Created] (TAJO-1265) min(), max() does not handle null properly

["Keuntae Park (JIRA)" <ji...@apache.org>]

Keuntae Park created TAJO-1265:
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             Summary: min(), max() does not handle null properly
                 Key: TAJO-1265
                 URL: https://issues.apache.org/jira/browse/TAJO-1265
             Project: Tajo
          Issue Type: Bug
            Reporter: Keuntae Park
            Assignee: Keuntae Park
            Priority: Minor


In other DBs like oracle and postgreSQL, 
null is excluded from calculation of min() and max() value until there is no non-null value in the given column, in which case, it returns null. 
However, current implementation of Tajo considers null as
0 for int or long column, 0.0 for float or double column, or "" for text column.
It needs to handle null value separately from non-null values in min() and max() calculation. 



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