Github user weijietong commented on the issue:
https://github.com/apache/drill/pull/889
@arina-ielchiieva I have corrected the codes as you guide. But sorry for
the unit tests, I have tried a long time to simulate a scan with 1 row ,but
failed to do that. The row count of a scan is fetched from the
AbstractGroupScan.getScanStats method. At my plugin ,I override this method to
ensure it will return 1 .
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