Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/22326
LGTM except some unnecessary end-to-end tests.
+1 for @mgaido91 's idea about unit test, something like the test suites
under `org.apache.spark.sql.catalyst.optimizer`. I'm ok to do it in a followup,
since it will be the first UT for python rules.
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