Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/22857#discussion_r238489445 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/DataFrameSuite.scala --- @@ -31,14 +31,14 @@ import org.apache.spark.scheduler.{SparkListener, SparkListenerJobEnd} import org.apache.spark.sql.catalyst.TableIdentifier import org.apache.spark.sql.catalyst.expressions.Uuid import org.apache.spark.sql.catalyst.optimizer.ConvertToLocalRelation -import org.apache.spark.sql.catalyst.plans.logical.{Filter, OneRowRelation, Union} +import org.apache.spark.sql.catalyst.plans.logical.{OneRowRelation, Union} --- End diff -- Yea, also it's unrelated import cleanup. It should be discouraged because it might make backporting / reverting potentially difficult, and sometimes those changes make readers confused.
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