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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