Github user arina-ielchiieva commented on the issue:
https://github.com/apache/drill/pull/889
@weijietong thanks for the PR.
1. Is it possible to add unit tests?
2. Can you please add in method description that a table scan with only one
row should also be considered as a scalar as well.
3. Please fix indention in `if` statements and change `currentrel` to camel
case [1].
[1] https://drill.apache.org/docs/apache-drill-contribution-guidelines/
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