Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/1993#discussion_r16334783
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins.scala ---
@@ -19,16 +19,15 @@ package org.apache.spark.sql.execution
import java.util.{HashMap => JavaHashMap}
-import scala.collection.mutable.{ArrayBuffer, BitSet}
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent._
import scala.concurrent.duration._
import org.apache.spark.annotation.DeveloperApi
-import org.apache.spark.sql.SQLContext
import org.apache.spark.sql.catalyst.expressions._
import org.apache.spark.sql.catalyst.plans._
import org.apache.spark.sql.catalyst.plans.physical._
+import org.apache.spark.util.collection.{AppendOnlyMap, CompactBuffer}
--- End diff --
We aren't actually using AppendOnlyMap though right?
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