Hyunsik Choi created TAJO-1659:
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             Summary: Simplify scan iteration in SeqScan
                 Key: TAJO-1659
                 URL: https://issues.apache.org/jira/browse/TAJO-1659
             Project: Tajo
          Issue Type: Improvement
          Components: physical operator
            Reporter: Hyunsik Choi
            Assignee: Hyunsik Choi
             Fix For: 0.11.0


SeqScanExec internally uses if-condition branch to perform filter iteration or 
full-scan iteration on a table. It is possible to cause branch misprediction. 
Also, this approach makes code messy. This patch introduce an scan iterator to 
simplify the if-condition branch.



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