Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/20174#discussion_r160602821
--- Diff:
sql/core/src/test/scala/org/apache/spark/sql/DataFrameAggregateSuite.scala ---
@@ -19,6 +19,8 @@ package org.apache.spark.sql
import scala.util.Random
+import org.apache.spark.sql.catalyst.expressions.Literal
+import org.apache.spark.sql.catalyst.expressions.aggregate.Percentile
--- End diff --
Remove unused imports?
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