[jira] [Created] (HAWQ-1753) add comment for data locality

[Zongtian Hou (Jira)]

Zongtian Hou created HAWQ-1753:
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             Summary: add comment for data locality
                 Key: HAWQ-1753
                 URL: https://issues.apache.org/jira/browse/HAWQ-1753
             Project: Apache HAWQ
          Issue Type: Improvement
          Components: Planner
            Reporter: Zongtian Hou
            Assignee: Radar Da Lei
             Fix For: 3.0.0.0


virtual segment and data locality part lack comment and is hard to understand.
add some detailed comments here



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