[SPARK-13583][CORE][STREAMING] Remove unused imports and add checkstyle rule

## What changes were proposed in this pull request?

After SPARK-6990, `dev/lint-java` keeps Java code healthy and helps PR review by saving much time.
This issue aims remove unused imports from Java/Scala code and add `UnusedImports` checkstyle rule to help developers.

## How was this patch tested?
```
./dev/lint-java
./build/sbt compile
```

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #11438 from dongjoon-hyun/SPARK-13583.

27 files changed, 10 insertions, 35 deletions

diff --git a/sql/core/src/main/java/org/apache/spark/sql/execution/UnsafeFixedWidthAggregationMap.java b/sql/core/src/main/java/org/apache/spark/sql/execution/UnsafeFixedWidthAggregationMap.java
index 2e84178d69..57e8218f3b 100644
--- a/sql/core/src/main/java/org/apache/spark/sql/execution/UnsafeFixedWidthAggregationMap.java
+++ b/sql/core/src/main/java/org/apache/spark/sql/execution/UnsafeFixedWidthAggregationMap.java
@@ -29,7 +29,6 @@ import org.apache.spark.sql.types.StructType;
 import org.apache.spark.unsafe.KVIterator;
 import org.apache.spark.unsafe.Platform;
 import org.apache.spark.unsafe.map.BytesToBytesMap;
-import org.apache.spark.unsafe.memory.MemoryLocation;
 
 /**
  * Unsafe-based HashMap for performing aggregations where the aggregated values are fixed-width.
diff --git a/sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedPlainValuesReader.java b/sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedPlainValuesReader.java
index ee9a7a221b..2672e0453b 100644
--- a/sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedPlainValuesReader.java
+++ b/sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedPlainValuesReader.java
@@ -18,11 +18,9 @@ package org.apache.spark.sql.execution.datasources.parquet;
 
 import java.io.IOException;
 
-import org.apache.spark.sql.Column;
 import org.apache.spark.sql.execution.vectorized.ColumnVector;
 import org.apache.spark.unsafe.Platform;
 
-import org.apache.commons.lang.NotImplementedException;
 import org.apache.parquet.column.values.ValuesReader;
 import org.apache.parquet.io.api.Binary;
 
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala b/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
index 5f5b7f4c19..844bc0fdd1 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala
@@ -20,7 +20,6 @@ package org.apache.spark.sql
 import java.io.CharArrayWriter
 
 import scala.language.implicitConversions
-import scala.reflect.ClassTag
 import scala.reflect.runtime.universe.TypeTag
 
 import com.fasterxml.jackson.core.JsonFactory
@@ -37,7 +36,8 @@ import org.apache.spark.sql.catalyst.optimizer.CombineUnions
 import org.apache.spark.sql.catalyst.plans._
 import org.apache.spark.sql.catalyst.plans.logical._
 import org.apache.spark.sql.catalyst.util.usePrettyExpression
-import org.apache.spark.sql.execution.{ExplainCommand, FileRelation, LogicalRDD, Queryable, QueryExecution, SQLExecution}
+import org.apache.spark.sql.execution.{ExplainCommand, FileRelation, LogicalRDD, Queryable,
+  QueryExecution, SQLExecution}
 import org.apache.spark.sql.execution.datasources.{CreateTableUsingAsSelect, LogicalRelation}
 import org.apache.spark.sql.execution.datasources.json.JacksonGenerator
 import org.apache.spark.sql.execution.python.EvaluatePython
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/GroupedDataset.scala b/sql/core/src/main/scala/org/apache/spark/sql/GroupedDataset.scala
index 53cb8eb524..cd8ed472ec 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/GroupedDataset.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/GroupedDataset.scala
@@ -25,7 +25,6 @@ import org.apache.spark.sql.catalyst.encoders.{encoderFor, ExpressionEncoder, Ou
 import org.apache.spark.sql.catalyst.expressions.{Alias, Attribute, CreateStruct}
 import org.apache.spark.sql.catalyst.plans.logical._
 import org.apache.spark.sql.execution.QueryExecution
-import org.apache.spark.sql.expressions.Aggregator
 
 /**
  * :: Experimental ::
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala b/sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala
index d8af799d89..22ded7a4bf 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/api/r/SQLUtils.scala
@@ -24,8 +24,8 @@ import scala.util.matching.Regex
 import org.apache.spark.api.java.{JavaRDD, JavaSparkContext}
 import org.apache.spark.api.r.SerDe
 import org.apache.spark.rdd.RDD
-import org.apache.spark.sql.{Column, DataFrame, GroupedData, Row, SaveMode, SQLContext}
-import org.apache.spark.sql.catalyst.expressions.{Alias, Expression, GenericRowWithSchema, NamedExpression}
+import org.apache.spark.sql.{DataFrame, Row, SaveMode, SQLContext}
+import org.apache.spark.sql.catalyst.expressions.GenericRowWithSchema
 import org.apache.spark.sql.types._
 
 private[r] object SQLUtils {
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala
index 4174e27e9c..8c41d80bf1 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/SparkQl.scala
@@ -21,7 +21,6 @@ import org.apache.spark.sql.catalyst.{CatalystQl, TableIdentifier}
 import org.apache.spark.sql.catalyst.analysis.UnresolvedRelation
 import org.apache.spark.sql.catalyst.parser.{ASTNode, ParserConf, SimpleParserConf}
 import org.apache.spark.sql.catalyst.plans.logical.{LogicalPlan, OneRowRelation}
-import org.apache.spark.sql.catalyst.plans.logical
 import org.apache.spark.sql.execution.datasources._
 import org.apache.spark.sql.types.StructType
 
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TungstenAggregationIterator.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TungstenAggregationIterator.scala
index c4f6594835..5e1ea90cd4 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TungstenAggregationIterator.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/aggregate/TungstenAggregationIterator.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.sql.execution.aggregate
 
-import org.apache.spark.{InternalAccumulator, Logging, TaskContext}
+import org.apache.spark.{Logging, TaskContext}
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.expressions.aggregate._
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/WriterContainer.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/WriterContainer.scala
index 097e9c912b..3653aca994 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/WriterContainer.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/WriterContainer.scala
@@ -26,7 +26,6 @@ import org.apache.hadoop.mapreduce.task.TaskAttemptContextImpl
 
 import org.apache.spark._
 import org.apache.spark.mapred.SparkHadoopMapRedUtil
-import org.apache.spark.sql._
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.plans.physical.HashPartitioning
 import org.apache.spark.sql.catalyst.InternalRow
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JSONRelation.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JSONRelation.scala
index 28136911fe..2eba52f326 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JSONRelation.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JSONRelation.scala
@@ -23,7 +23,6 @@ import com.fasterxml.jackson.core.JsonFactory
 import com.google.common.base.Objects
 import org.apache.hadoop.fs.{FileStatus, Path}
 import org.apache.hadoop.io.{LongWritable, NullWritable, Text}
-import org.apache.hadoop.io.SequenceFile.CompressionType
 import org.apache.hadoop.mapred.{JobConf, TextInputFormat}
 import org.apache.hadoop.mapreduce.{Job, RecordWriter, TaskAttemptContext}
 import org.apache.hadoop.mapreduce.lib.input.FileInputFormat
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JacksonGenerator.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JacksonGenerator.scala
index 078e1cbec5..8b920ecafa 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JacksonGenerator.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/json/JacksonGenerator.scala
@@ -17,11 +17,8 @@
 
 package org.apache.spark.sql.execution.datasources.json
 
-import scala.collection.Map
-
 import com.fasterxml.jackson.core._
 
-import org.apache.spark.sql.Row
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.util.{ArrayData, DateTimeUtils, MapData}
 import org.apache.spark.sql.types._
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/CatalystReadSupport.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/CatalystReadSupport.scala
index c3b7483e80..e34309bab1 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/CatalystReadSupport.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/parquet/CatalystReadSupport.scala
@@ -29,7 +29,6 @@ import org.apache.parquet.schema._
 import org.apache.parquet.schema.Type.Repetition
 
 import org.apache.spark.Logging
-import org.apache.spark.deploy.SparkHadoopUtil
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.types._
 
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashSemiJoin.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashSemiJoin.scala
index 3eed6e3e11..813ec02425 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashSemiJoin.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashSemiJoin.scala
@@ -19,7 +19,6 @@ package org.apache.spark.sql.execution.joins
 
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.expressions._
-import org.apache.spark.sql.catalyst.plans.physical.BroadcastMode
 import org.apache.spark.sql.execution.SparkPlan
 import org.apache.spark.sql.execution.metric.LongSQLMetric
 
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
index 606269bf25..9a3cdaf697 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/joins/HashedRelation.scala
@@ -26,7 +26,7 @@ import org.apache.spark.memory.{StaticMemoryManager, TaskMemoryManager}
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.plans.physical.BroadcastMode
-import org.apache.spark.sql.execution.{SparkPlan, SparkSqlSerializer}
+import org.apache.spark.sql.execution.SparkSqlSerializer
 import org.apache.spark.sql.execution.local.LocalNode
 import org.apache.spark.unsafe.Platform
 import org.apache.spark.unsafe.map.BytesToBytesMap
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala
index 45175d36d5..5a7516b7f9 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala
@@ -24,7 +24,6 @@ import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.catalyst.expressions.codegen.{CodegenContext, ExprCode, LazilyGeneratedOrdering}
 import org.apache.spark.sql.catalyst.plans.physical._
 import org.apache.spark.sql.execution.exchange.ShuffleExchange
-import org.apache.spark.sql.execution.metric.SQLMetrics
 
 
 /**
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/local/BinaryHashJoinNode.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/local/BinaryHashJoinNode.scala
index 8f063e24fb..97f9358016 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/local/BinaryHashJoinNode.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/local/BinaryHashJoinNode.scala
@@ -17,7 +17,6 @@
 
 package org.apache.spark.sql.execution.local
 
-import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.execution.joins.{BuildLeft, BuildRight, BuildSide, HashedRelation}
 import org.apache.spark.sql.internal.SQLConf
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/local/BroadcastHashJoinNode.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/local/BroadcastHashJoinNode.scala
index 9ffa272d21..779f4833fa 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/local/BroadcastHashJoinNode.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/local/BroadcastHashJoinNode.scala
@@ -18,7 +18,6 @@
 package org.apache.spark.sql.execution.local
 
 import org.apache.spark.broadcast.Broadcast
-import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.expressions._
 import org.apache.spark.sql.execution.joins.{BuildLeft, BuildRight, BuildSide, HashedRelation}
 import org.apache.spark.sql.internal.SQLConf
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompositeOffset.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompositeOffset.scala
index d2cb20ef8b..59a52a3d59 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompositeOffset.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/CompositeOffset.scala
@@ -17,8 +17,6 @@
 
 package org.apache.spark.sql.execution.streaming
 
-import scala.util.Try
-
 /**
  * An ordered collection of offsets, used to track the progress of processing data from one or more
  * [[Source]]s that are present in a streaming query. This is similar to simplified, single-instance
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/expressions/WindowSpec.scala b/sql/core/src/main/scala/org/apache/spark/sql/expressions/WindowSpec.scala
index 3921147857..9e9c58cb66 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/expressions/WindowSpec.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/expressions/WindowSpec.scala
@@ -20,7 +20,6 @@ package org.apache.spark.sql.expressions
 import org.apache.spark.annotation.Experimental
 import org.apache.spark.sql.{catalyst, Column}
 import org.apache.spark.sql.catalyst.expressions._
-import org.apache.spark.sql.catalyst.expressions.aggregate._
 
 /**
  * :: Experimental ::
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/UserDefinedTypeSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/UserDefinedTypeSuite.scala
index 6800a8ddf6..9081bc722a 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/UserDefinedTypeSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/UserDefinedTypeSuite.scala
@@ -26,7 +26,6 @@ import org.apache.spark.sql.execution.datasources.parquet.ParquetTest
 import org.apache.spark.sql.functions._
 import org.apache.spark.sql.test.SharedSQLContext
 import org.apache.spark.sql.types._
-import org.apache.spark.util.collection.OpenHashSet
 
 @SQLUserDefinedType(udt = classOf[MyDenseVectorUDT])
 private[sql] class MyDenseVector(val data: Array[Double]) extends Serializable {
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/execution/ReferenceSort.scala b/sql/core/src/test/scala/org/apache/spark/sql/execution/ReferenceSort.scala
index 273937fa8c..2963a856d1 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/execution/ReferenceSort.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/execution/ReferenceSort.scala
@@ -17,7 +17,7 @@
 
 package org.apache.spark.sql.execution
 
-import org.apache.spark.{InternalAccumulator, TaskContext}
+import org.apache.spark.TaskContext
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql.catalyst.InternalRow
 import org.apache.spark.sql.catalyst.errors._
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/execution/SQLExecutionSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/execution/SQLExecutionSuite.scala
index 63639681ef..824d89e3b2 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/execution/SQLExecutionSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/execution/SQLExecutionSuite.scala
@@ -19,8 +19,6 @@ package org.apache.spark.sql.execution
 
 import java.util.Properties
 
-import scala.collection.parallel.CompositeThrowable
-
 import org.apache.spark.{SparkConf, SparkContext, SparkFunSuite}
 import org.apache.spark.sql.SQLContext
 
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/execution/SparkPlanTest.scala b/sql/core/src/test/scala/org/apache/spark/sql/execution/SparkPlanTest.scala
index 8549a6a0f6..aa928cfc80 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/execution/SparkPlanTest.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/execution/SparkPlanTest.scala
@@ -18,11 +18,10 @@
 package org.apache.spark.sql.execution
 
 import scala.language.implicitConversions
-import scala.reflect.runtime.universe.TypeTag
 import scala.util.control.NonFatal
 
 import org.apache.spark.SparkFunSuite
-import org.apache.spark.sql.{DataFrame, DataFrameHolder, Row, SQLContext}
+import org.apache.spark.sql.{DataFrame, Row, SQLContext}
 import org.apache.spark.sql.catalyst.analysis.UnresolvedAttribute
 import org.apache.spark.sql.test.SQLTestUtils
 
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/execution/UnsafeFixedWidthAggregationMapSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/execution/UnsafeFixedWidthAggregationMapSuite.scala
index c7df8b51e2..4dc7d3461c 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/execution/UnsafeFixedWidthAggregationMapSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/execution/UnsafeFixedWidthAggregationMapSuite.scala
@@ -26,7 +26,7 @@ import org.scalatest.Matchers
 import org.apache.spark.{SparkConf, SparkFunSuite, TaskContext, TaskContextImpl}
 import org.apache.spark.memory.{TaskMemoryManager, TestMemoryManager}
 import org.apache.spark.sql.catalyst.InternalRow
-import org.apache.spark.sql.catalyst.expressions.{UnsafeProjection, UnsafeRow}
+import org.apache.spark.sql.catalyst.expressions.UnsafeRow
 import org.apache.spark.sql.test.SharedSQLContext
 import org.apache.spark.sql.types._
 import org.apache.spark.unsafe.types.UTF8String
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/execution/UnsafeRowSerializerSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/execution/UnsafeRowSerializerSuite.scala
index 7438e11ef7..50bdcd6c2c 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/execution/UnsafeRowSerializerSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/execution/UnsafeRowSerializerSuite.scala
@@ -20,7 +20,6 @@ package org.apache.spark.sql.execution
 import java.io.{ByteArrayInputStream, ByteArrayOutputStream, File}
 
 import org.apache.spark._
-import org.apache.spark.executor.ShuffleWriteMetrics
 import org.apache.spark.memory.TaskMemoryManager
 import org.apache.spark.rdd.RDD
 import org.apache.spark.sql.Row
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/execution/columnar/PartitionBatchPruningSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/execution/columnar/PartitionBatchPruningSuite.scala
index d19fec6140..4f185ed283 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/execution/columnar/PartitionBatchPruningSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/execution/columnar/PartitionBatchPruningSuite.scala
@@ -20,7 +20,6 @@ package org.apache.spark.sql.execution.columnar
 import org.scalatest.BeforeAndAfterEach
 
 import org.apache.spark.SparkFunSuite
-import org.apache.spark.sql._
 import org.apache.spark.sql.internal.SQLConf
 import org.apache.spark.sql.test.SharedSQLContext
 import org.apache.spark.sql.test.SQLTestData._
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetEncodingSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetEncodingSuite.scala
index 281a2cffa8..29318d8b56 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetEncodingSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetEncodingSuite.scala
@@ -16,7 +16,6 @@
  */
 package org.apache.spark.sql.execution.datasources.parquet
 
-import org.apache.spark.sql.execution.vectorized.ColumnVectorUtils
 import org.apache.spark.sql.test.SharedSQLContext
 
 // TODO: this needs a lot more testing but it's currently not easy to test with the parquet
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/execution/local/HashJoinNodeSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/execution/local/HashJoinNodeSuite.scala
index 268f2aac87..74142ea598 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/execution/local/HashJoinNodeSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/execution/local/HashJoinNodeSuite.scala
@@ -21,7 +21,7 @@ import org.mockito.Mockito.{mock, when}
 
 import org.apache.spark.broadcast.TorrentBroadcast
 import org.apache.spark.sql.catalyst.dsl.expressions._
-import org.apache.spark.sql.catalyst.expressions.{Expression, InterpretedMutableProjection, UnsafeProjection}
+import org.apache.spark.sql.catalyst.expressions.{Expression, UnsafeProjection}
 import org.apache.spark.sql.execution.joins.{BuildLeft, BuildRight, BuildSide, HashedRelation}
 import org.apache.spark.sql.internal.SQLConf