[jira] [Created] (TAJO-539) Change some EvalNode::eval to directly return a Datum value

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-539:
---------------------------------

             Summary: Change some EvalNode::eval to directly return a Datum 
value
                 Key: TAJO-539
                 URL: https://issues.apache.org/jira/browse/TAJO-539
             Project: Tajo
          Issue Type: Improvement
          Components: operator/expression
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.8-incubating


After TAJO-501, we can ensure that all expressions except for 
AggregationFunctionCallEval can evaluated by calling once eval() instead of 
calling eval followed by terminate. In addition, current EvalNode 
implementation involves unnecessary memory consumption to keep EvalContext for 
all expressions which are not even aggregation eval. 

If we change EvalNode::eval() to directly return a Datum value, it would be 
reduce the memory consumption and CPU costs.



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