[jira] [Created] (TAJO-1422) Investigate the case where fragments == null in SeqScanExec

[Hyunsik Choi (JIRA)]

Hyunsik Choi created TAJO-1422:
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             Summary: Investigate the case where fragments == null in 
SeqScanExec
                 Key: TAJO-1422
                 URL: https://issues.apache.org/jira/browse/TAJO-1422
             Project: Tajo
          Issue Type: Improvement
            Reporter: Hyunsik Choi
            Priority: Minor


See the following part in SeqScanExec. Intuitively, we don't need to make and 
execute Task if fragments is null. But, the current code requires null check. 
We need to investigate its essential cause, and we should remove this case if 
possible.

{code:title=SeqScanExec.java}
    if (fragments != null) {
      if (fragments.length > 1) {
        this.scanner = new MergeScanner(context.getConf(), 
plan.getPhysicalSchema(), meta,
            FragmentConvertor.convert(context.getConf(), fragments), projected
        );
{code}



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