Github user facaiy commented on a diff in the pull request:
https://github.com/apache/spark/pull/18764#discussion_r130200288
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/classification/OneVsRestSuite.scala ---
@@ -33,6 +33,7 @@ import org.apache.spark.mllib.util.MLlibTestSparkContext
import org.apache.spark.mllib.util.TestingUtils._
import org.apache.spark.rdd.RDD
import org.apache.spark.sql.Dataset
+import org.apache.spark.sql.functions._
--- End diff --
add missing import for branch 2.0
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