Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/21911
> Which test suite is a good place to add such end-to-end case?
org.apache.spark.sql.SQLQuerySuite might be the best place.
> Do we plan to support such call as df.hint("COALESCE", Seq(10))? Why not
just use df.coalesce(10)?
It also does not make sense to block it. Since this is a new hint, we
should check whether it works.
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