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Posted to commits@drill.apache.org by ja...@apache.org on 2014/09/12 17:17:21 UTC

[12/37] DRILL-634: Cleanup/organize Java imports and trailing whitespaces from Drill code

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillStoreRel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillStoreRel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillStoreRel.java
index 830c34b..6295eab 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillStoreRel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillStoreRel.java
@@ -23,8 +23,6 @@ import net.hydromatic.optiq.prepare.Prepare.CatalogReader;
 
 import org.apache.drill.common.logical.data.LogicalOperator;
 import org.apache.drill.exec.planner.common.DrillStoreRelBase;
-import org.apache.drill.exec.planner.logical.DrillImplementor;
-import org.apache.drill.exec.planner.logical.DrillRel;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelOptTable;
@@ -36,7 +34,7 @@ public class DrillStoreRel extends DrillStoreRelBase implements DrillRel{
   protected DrillStoreRel(RelOptCluster cluster, RelTraitSet traits, RelOptTable table, CatalogReader catalogReader,
       RelNode child, Operation operation, List<String> updateColumnList, boolean flattened) {
     super(cluster, traits, table, catalogReader, child, operation, updateColumnList, flattened);
-    
+
   }
 
   @Override

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillTable.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillTable.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillTable.java
index 8e6b914..2e7f9f2 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillTable.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillTable.java
@@ -33,18 +33,18 @@ import org.eigenbase.relopt.RelOptTable;
 
 
 public abstract class DrillTable implements Table{
-  
-  private final String storageEngineName;  
+
+  private final String storageEngineName;
   public final StoragePluginConfig storageEngineConfig;
   private Object selection;
   private StoragePlugin plugin;
-  private GroupScan scan; 
-  
+  private GroupScan scan;
+
   /** Creates a DrillTable. */
   public DrillTable(String storageEngineName, StoragePlugin plugin, Object selection) {
     this.selection = selection;
     this.plugin = plugin;
-    
+
     this.storageEngineConfig = plugin.getConfig();
     this.storageEngineName = storageEngineName;
   }
@@ -55,19 +55,19 @@ public abstract class DrillTable implements Table{
     }
     return scan;
   }
-  
+
   public StoragePluginConfig getStorageEngineConfig(){
     return storageEngineConfig;
   }
-  
+
   public StoragePlugin getPlugin(){
     return plugin;
   }
-    
+
   public Object getSelection() {
     return selection;
   }
-  
+
   public String getStorageEngineName() {
     return storageEngineName;
   }
@@ -125,6 +125,6 @@ public abstract class DrillTable implements Table{
     return true;
   }
 
-  
-  
+
+
 }
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRel.java
index fdf43dd..1fa7001 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRel.java
@@ -24,7 +24,6 @@ import net.hydromatic.linq4j.Ord;
 import org.apache.drill.common.logical.data.LogicalOperator;
 import org.apache.drill.common.logical.data.Union;
 import org.apache.drill.exec.planner.common.DrillUnionRelBase;
-import org.apache.drill.exec.planner.logical.DrillImplementor;
 import org.apache.drill.exec.planner.torel.ConversionContext;
 import org.eigenbase.rel.InvalidRelException;
 import org.eigenbase.rel.RelNode;
@@ -46,7 +45,7 @@ public class DrillUnionRel extends DrillUnionRelBase implements DrillRel {
   @Override
   public DrillUnionRel copy(RelTraitSet traitSet, List<RelNode> inputs,
       boolean all) {
-    try { 
+    try {
       return new DrillUnionRel(getCluster(), traitSet, inputs, all);
     } catch (InvalidRelException e) {
       throw new AssertionError(e) ;
@@ -68,7 +67,7 @@ public class DrillUnionRel extends DrillUnionRelBase implements DrillRel {
     builder.setDistinct(!all);
     return builder.build();
   }
-  
+
   public static DrillUnionRel convert(Union union, ConversionContext context) throws InvalidRelException{
     throw new UnsupportedOperationException();
   }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRule.java
index 86ced35..93a0391 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DrillUnionRule.java
@@ -51,7 +51,7 @@ public class DrillUnionRule extends RelOptRule {
       final RelNode convertedInput = convert(input, input.getTraitSet().plus(DrillRel.DRILL_LOGICAL));
       convertedInputs.add(convertedInput);
     }
-    try { 
+    try {
       call.transformTo(new DrillUnionRel(union.getCluster(), traits, convertedInputs, union.all));
     } catch (InvalidRelException e) {
       tracer.warning(e.toString()) ;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DynamicDrillTable.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DynamicDrillTable.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DynamicDrillTable.java
index e7ff266..843db58 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DynamicDrillTable.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/DynamicDrillTable.java
@@ -17,7 +17,6 @@
  */
 package org.apache.drill.exec.planner.logical;
 
-import org.apache.drill.common.logical.StoragePluginConfig;
 import org.apache.drill.exec.planner.types.RelDataTypeDrillImpl;
 import org.apache.drill.exec.planner.types.RelDataTypeHolder;
 import org.apache.drill.exec.store.StoragePlugin;
@@ -28,7 +27,7 @@ public class DynamicDrillTable extends DrillTable{
   static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(DynamicDrillTable.class);
 
   private RelDataTypeHolder holder = new RelDataTypeHolder();
-  
+
   public DynamicDrillTable(StoragePlugin plugin, String storageEngineName, Object selection) {
     super(storageEngineName, plugin, selection);
   }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/EnumerableDrillRule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/EnumerableDrillRule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/EnumerableDrillRule.java
index efc29f4..131c60f 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/EnumerableDrillRule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/EnumerableDrillRule.java
@@ -29,8 +29,8 @@ import org.eigenbase.rel.convert.ConverterRule;
 public class EnumerableDrillRule extends ConverterRule {
 
   public static EnumerableDrillRule INSTANCE = new EnumerableDrillRule();
-  
-  
+
+
   private EnumerableDrillRule() {
     super(RelNode.class, DrillRel.DRILL_LOGICAL, EnumerableConvention.INSTANCE, "EnumerableDrillRule.");
   }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ExprHelper.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ExprHelper.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ExprHelper.java
index 128ba28..d4321bc 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ExprHelper.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ExprHelper.java
@@ -21,7 +21,6 @@ import java.util.List;
 
 import org.apache.drill.common.expression.FunctionCall;
 import org.apache.drill.common.expression.LogicalExpression;
-import org.apache.drill.common.expression.SchemaPath;
 
 public class ExprHelper {
   static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ExprHelper.class);

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/FileSystemCreateTableEntry.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/FileSystemCreateTableEntry.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/FileSystemCreateTableEntry.java
index 88d17a3..6784888 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/FileSystemCreateTableEntry.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/FileSystemCreateTableEntry.java
@@ -17,10 +17,8 @@
  */
 package org.apache.drill.exec.planner.logical;
 
-import com.fasterxml.jackson.annotation.JacksonInject;
-import com.fasterxml.jackson.annotation.JsonCreator;
-import com.fasterxml.jackson.annotation.JsonProperty;
-import com.fasterxml.jackson.annotation.JsonTypeName;
+import java.io.IOException;
+
 import org.apache.drill.common.exceptions.ExecutionSetupException;
 import org.apache.drill.common.logical.FormatPluginConfig;
 import org.apache.drill.exec.physical.base.PhysicalOperator;
@@ -29,7 +27,10 @@ import org.apache.drill.exec.store.StoragePluginRegistry;
 import org.apache.drill.exec.store.dfs.FileSystemConfig;
 import org.apache.drill.exec.store.dfs.FormatPlugin;
 
-import java.io.IOException;
+import com.fasterxml.jackson.annotation.JacksonInject;
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeName;
 
 /**
  * Implements <code>CreateTableEntry</code> interface to create new tables in FileSystem storage.

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RelOptHelper.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RelOptHelper.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RelOptHelper.java
index 2e253ab..172ee2a 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RelOptHelper.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RelOptHelper.java
@@ -24,7 +24,7 @@ import org.eigenbase.relopt.RelTrait;
 
 public class RelOptHelper {
   static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(RelOptHelper.class);
-  
+
   public static RelOptRuleOperand any(Class<? extends RelNode> first, RelTrait trait){
     return RelOptRule.operand(first, trait, RelOptRule.any());
   }
@@ -36,7 +36,7 @@ public class RelOptHelper {
   public static RelOptRuleOperand any(Class<? extends RelNode> first, Class<? extends RelNode> second) {
     return RelOptRule.operand(first, RelOptRule.operand(second, RelOptRule.any()));
   }
-  
+
   public static RelOptRuleOperand some(Class<? extends RelNode> rel, RelOptRuleOperand first, RelOptRuleOperand... rest){
     return RelOptRule.operand(rel, RelOptRule.some(first, rest));
   }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RewriteProjectRel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RewriteProjectRel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RewriteProjectRel.java
index 0e4c71d..f0ff70c 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RewriteProjectRel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/RewriteProjectRel.java
@@ -17,6 +17,9 @@
  */
 package org.apache.drill.exec.planner.logical;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.apache.drill.exec.planner.sql.DrillOperatorTable;
 import org.eigenbase.rel.ProjectRel;
 import org.eigenbase.rel.RelNode;
@@ -30,9 +33,6 @@ import org.eigenbase.sql.SqlFunction;
 import org.eigenbase.sql.SqlOperator;
 import org.eigenbase.util.NlsString;
 
-import java.util.ArrayList;
-import java.util.List;
-
 /**
  * This class rewrites all the project expression that contain convert_to/ convert_from
  * to actual implementations.

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ScanFieldDeterminer.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ScanFieldDeterminer.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ScanFieldDeterminer.java
index 9809770..59c65f9 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ScanFieldDeterminer.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/logical/ScanFieldDeterminer.java
@@ -56,7 +56,7 @@ public class ScanFieldDeterminer extends AbstractLogicalVisitor<Void, ScanFieldD
   private FieldReferenceFinder finder = new FieldReferenceFinder();
   private Map<Scan, FieldList> scanFields = Maps.newHashMap();
 
-  
+
   public static Map<Scan, FieldList> getFieldLists(LogicalPlan plan){
     Collection<SinkOperator> ops = plan.getGraph().getRoots();
     Preconditions.checkArgument(ops.size() == 1, "Scan Field determiner currently only works with plans that have a single root.");
@@ -64,10 +64,10 @@ public class ScanFieldDeterminer extends AbstractLogicalVisitor<Void, ScanFieldD
     ops.iterator().next().accept(sfd, new FieldList());
     return sfd.scanFields;
   }
-  
+
   private ScanFieldDeterminer(){
   }
-  
+
   public static class FieldList {
     private Set<SchemaPath> projected = Sets.newHashSet();
     private Set<SchemaPath> referenced = Sets.newHashSet();
@@ -88,6 +88,7 @@ public class ScanFieldDeterminer extends AbstractLogicalVisitor<Void, ScanFieldD
       projected.addAll(paths);
     }
 
+    @Override
     public FieldList clone() {
       FieldList newList = new FieldList();
       for (SchemaPath p : projected) {
@@ -166,7 +167,7 @@ public class ScanFieldDeterminer extends AbstractLogicalVisitor<Void, ScanFieldD
       }
       join.getLeft().accept(this, leftList);
     }
-    
+
     {
       FieldList rightList = fl.clone();
       for (JoinCondition c : join.getConditions()) {
@@ -191,7 +192,7 @@ public class ScanFieldDeterminer extends AbstractLogicalVisitor<Void, ScanFieldD
     return null;
   }
 
-  
+
   /**
    * Search through a LogicalExpression, finding all internal schema path references and returning them in a set.
    */

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/AggPruleBase.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/AggPruleBase.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/AggPruleBase.java
index a61bfd6..e6c815b 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/AggPruleBase.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/AggPruleBase.java
@@ -69,7 +69,7 @@ public abstract class AggPruleBase extends Prule {
 
     for (AggregateCall aggCall : aggregate.getAggCallList()) {
       String name = aggCall.getAggregation().getName();
-      if ( ! (name.equals("SUM") || name.equals("MIN") || name.equals("MAX") || name.equals("COUNT") 
+      if ( ! (name.equals("SUM") || name.equals("MIN") || name.equals("MAX") || name.equals("COUNT")
               || name.equals("$SUM0"))) {
         return false;
       }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/BroadcastExchangePrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/BroadcastExchangePrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/BroadcastExchangePrel.java
index 39ab26b..0c76de4 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/BroadcastExchangePrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/BroadcastExchangePrel.java
@@ -19,8 +19,6 @@
 package org.apache.drill.exec.planner.physical;
 
 import java.io.IOException;
-import java.util.Collections;
-import java.util.Iterator;
 import java.util.List;
 
 import org.apache.drill.exec.physical.base.PhysicalOperator;
@@ -29,7 +27,6 @@ import org.apache.drill.exec.physical.config.SelectionVectorRemover;
 import org.apache.drill.exec.planner.cost.DrillCostBase;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
-import org.eigenbase.rel.SingleRel;
 import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelOptCost;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ComplexToJsonPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ComplexToJsonPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ComplexToJsonPrel.java
index 35e8278..bec3704 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ComplexToJsonPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ComplexToJsonPrel.java
@@ -35,7 +35,7 @@ public class ComplexToJsonPrel extends SingleRel implements Prel {
     super(phyRelNode.getCluster(), phyRelNode.getTraitSet(), phyRelNode);
   }
 
-  @Override 
+  @Override
   public final RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
     return new ComplexToJsonPrel((Prel) sole(inputs));
   }
@@ -70,5 +70,5 @@ public class ComplexToJsonPrel extends SingleRel implements Prel {
   public boolean needsFinalColumnReordering() {
     return true;
   }
-  
+
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ConvertCountToDirectScan.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ConvertCountToDirectScan.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ConvertCountToDirectScan.java
index ce3227d..620cf1f 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ConvertCountToDirectScan.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ConvertCountToDirectScan.java
@@ -27,10 +27,6 @@ import org.apache.drill.exec.planner.logical.DrillAggregateRel;
 import org.apache.drill.exec.planner.logical.DrillProjectRel;
 import org.apache.drill.exec.planner.logical.DrillScanRel;
 import org.apache.drill.exec.planner.logical.RelOptHelper;
-import org.apache.drill.exec.planner.physical.DrillDistributionTrait;
-import org.apache.drill.exec.planner.physical.Prel;
-import org.apache.drill.exec.planner.physical.ProjectPrel;
-import org.apache.drill.exec.planner.physical.ScanPrel;
 import org.apache.drill.exec.store.direct.DirectGroupScan;
 import org.apache.drill.exec.store.pojo.PojoRecordReader;
 import org.eigenbase.rel.AggregateCall;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
index df49ee3..c45ae17 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTrait.java
@@ -35,7 +35,7 @@ public class DrillDistributionTrait implements RelTrait {
 
   private DistributionType type;
   private final ImmutableList<DistributionField> fields;
-  
+
   public DrillDistributionTrait(DistributionType type) {
     assert (type == DistributionType.SINGLETON || type == DistributionType.RANDOM_DISTRIBUTED || type == DistributionType.ANY
             || type == DistributionType.ROUND_ROBIN_DISTRIBUTED || type == DistributionType.BROADCAST_DISTRIBUTED);
@@ -68,7 +68,7 @@ public class DrillDistributionTrait implements RelTrait {
           // Following can satisfy the requirements: {a}, {b}, {c}, {a, b}, {b, c}, {a, c} or {a, b, c}
 
           // New: Use equals for subsumes check of hash distribution. If we uses subsumes,
-          // a join may end up with hash-distributions using different keys. This would 
+          // a join may end up with hash-distributions using different keys. This would
           // cause incorrect query result.
           return this.equals(trait);
         }
@@ -93,10 +93,12 @@ public class DrillDistributionTrait implements RelTrait {
     return fields;
   }
 
+  @Override
   public int hashCode() {
     return  fields == null ? type.hashCode() : type.hashCode() | fields.hashCode() << 4 ;
   }
 
+  @Override
   public boolean equals(Object obj) {
     if (this == obj) {
       return true;
@@ -124,6 +126,7 @@ public class DrillDistributionTrait implements RelTrait {
       this.fieldId = fieldId;
     }
 
+    @Override
     public boolean equals(Object obj) {
       if (!(obj instanceof DistributionField)) {
         return false;
@@ -132,6 +135,7 @@ public class DrillDistributionTrait implements RelTrait {
       return this.fieldId == other.fieldId;
     }
 
+    @Override
     public int hashCode() {
       return this.fieldId;
     }
@@ -140,6 +144,7 @@ public class DrillDistributionTrait implements RelTrait {
       return this.fieldId;
     }
 
+    @Override
     public String toString() {
       return String.format("[$%s]", this.fieldId);
     }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTraitDef.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTraitDef.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTraitDef.java
index 06c2319..6a1dbb7 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTraitDef.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillDistributionTraitDef.java
@@ -23,56 +23,61 @@ import org.eigenbase.relopt.RelTraitDef;
 
 public class DrillDistributionTraitDef extends RelTraitDef<DrillDistributionTrait>{
   public static final DrillDistributionTraitDef INSTANCE = new DrillDistributionTraitDef();
-  
+
   private DrillDistributionTraitDef() {
     super();
   }
-  
+
+  @Override
   public boolean canConvert(
       RelOptPlanner planner, DrillDistributionTrait fromTrait, DrillDistributionTrait toTrait) {
     return true;
-  }  
+  }
 
+  @Override
   public Class<DrillDistributionTrait> getTraitClass(){
     return DrillDistributionTrait.class;
   }
-  
+
+  @Override
   public DrillDistributionTrait getDefault() {
     return DrillDistributionTrait.DEFAULT;
   }
 
+  @Override
   public String getSimpleName() {
     return this.getClass().getSimpleName();
   }
-  
+
   // implement RelTraitDef
+  @Override
   public RelNode convert(
       RelOptPlanner planner,
       RelNode rel,
       DrillDistributionTrait toDist,
       boolean allowInfiniteCostConverters) {
-    
+
     DrillDistributionTrait currentDist = rel.getTraitSet().getTrait(DrillDistributionTraitDef.INSTANCE);
-    
+
     // Source and Target have the same trait.
     if (currentDist.equals(toDist)) {
       return rel;
     }
-    
+
     // Source trait is "ANY", which is abstract type of distribution.
-    // We do not want to convert from "ANY", since it's abstract. 
+    // We do not want to convert from "ANY", since it's abstract.
     // Source trait should be concrete type: SINGLETON, HASH_DISTRIBUTED, etc.
     if (currentDist.equals(DrillDistributionTrait.DEFAULT)) {
         return null;
     }
-    
+
     switch(toDist.getType()){
       // UnionExchange, HashToRandomExchange, OrderedPartitionExchange and BroadcastExchange destroy the ordering property,
       // therefore RelCollation is set to default, which is EMPTY.
-      case SINGLETON:         
+      case SINGLETON:
         return new UnionExchangePrel(rel.getCluster(), planner.emptyTraitSet().plus(Prel.DRILL_PHYSICAL).plus(toDist), rel);
       case HASH_DISTRIBUTED:
-        return new HashToRandomExchangePrel(rel.getCluster(), planner.emptyTraitSet().plus(Prel.DRILL_PHYSICAL).plus(toDist), rel, 
+        return new HashToRandomExchangePrel(rel.getCluster(), planner.emptyTraitSet().plus(Prel.DRILL_PHYSICAL).plus(toDist), rel,
                                             toDist.getFields());
       case RANGE_DISTRIBUTED:
         return new OrderedPartitionExchangePrel(rel.getCluster(), planner.emptyTraitSet().plus(Prel.DRILL_PHYSICAL).plus(toDist), rel);

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillScanPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillScanPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillScanPrel.java
index b026c22..a452bac 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillScanPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/DrillScanPrel.java
@@ -20,7 +20,7 @@ package org.apache.drill.exec.planner.physical;
 import org.apache.drill.exec.physical.base.GroupScan;
 
 public interface DrillScanPrel extends Prel{
-  
+
   public GroupScan getGroupScan();
-  
+
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/FilterPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/FilterPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/FilterPrel.java
index 996e80a..99d000c 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/FilterPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/FilterPrel.java
@@ -25,16 +25,11 @@ import java.util.List;
 import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.Filter;
 import org.apache.drill.exec.planner.common.DrillFilterRelBase;
-import org.apache.drill.exec.planner.cost.DrillCostBase;
-import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
 import org.apache.drill.exec.planner.logical.DrillParseContext;
 import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
-import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptCluster;
-import org.eigenbase.relopt.RelOptCost;
-import org.eigenbase.relopt.RelOptPlanner;
 import org.eigenbase.relopt.RelTraitSet;
 import org.eigenbase.rex.RexNode;
 
@@ -84,5 +79,5 @@ public class FilterPrel extends DrillFilterRelBase implements Prel {
   public boolean needsFinalColumnReordering() {
     return true;
   }
-  
+
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrel.java
index c1b1fba..0b9dcb6 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrel.java
@@ -17,6 +17,10 @@
  */
 package org.apache.drill.exec.planner.physical;
 
+import java.io.IOException;
+import java.util.BitSet;
+import java.util.List;
+
 import org.apache.drill.common.logical.data.NamedExpression;
 import org.apache.drill.exec.ExecConstants;
 import org.apache.drill.exec.expr.holders.IntHolder;
@@ -35,10 +39,6 @@ import org.eigenbase.relopt.RelOptCost;
 import org.eigenbase.relopt.RelOptPlanner;
 import org.eigenbase.relopt.RelTraitSet;
 
-import java.io.IOException;
-import java.util.BitSet;
-import java.util.List;
-
 public class HashAggPrel extends AggPrelBase implements Prel{
 
   static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(HashAggPrel.class);
@@ -48,6 +48,7 @@ public class HashAggPrel extends AggPrelBase implements Prel{
     super(cluster, traits, child, groupSet, aggCalls, phase);
   }
 
+  @Override
   public AggregateRelBase copy(RelTraitSet traitSet, RelNode input, BitSet groupSet, List<AggregateCall> aggCalls) {
     try {
       return new HashAggPrel(getCluster(), traitSet, input, getGroupSet(), aggCalls,

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrule.java
index e2ee57f..0439bbb 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashAggPrule.java
@@ -17,7 +17,8 @@
  */
 package org.apache.drill.exec.planner.physical;
 
-import com.google.common.collect.ImmutableList;
+import java.util.logging.Logger;
+
 import org.apache.drill.exec.planner.logical.DrillAggregateRel;
 import org.apache.drill.exec.planner.logical.RelOptHelper;
 import org.apache.drill.exec.planner.physical.AggPrelBase.OperatorPhase;
@@ -29,7 +30,7 @@ import org.eigenbase.relopt.RelTrait;
 import org.eigenbase.relopt.RelTraitSet;
 import org.eigenbase.trace.EigenbaseTrace;
 
-import java.util.logging.Logger;
+import com.google.common.collect.ImmutableList;
 
 public class HashAggPrule extends AggPruleBase {
   public static final RelOptRule INSTANCE = new HashAggPrule();

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrel.java
index aaf18b1..d9a7277 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrel.java
@@ -17,7 +17,9 @@
  */
 package org.apache.drill.exec.planner.physical;
 
-import com.google.common.collect.Lists;
+import java.io.IOException;
+import java.util.List;
+
 import org.apache.drill.common.expression.FieldReference;
 import org.apache.drill.common.logical.data.JoinCondition;
 import org.apache.drill.exec.ExecConstants;
@@ -40,8 +42,7 @@ import org.eigenbase.relopt.RelTraitSet;
 import org.eigenbase.rex.RexNode;
 import org.eigenbase.util.Pair;
 
-import java.io.IOException;
-import java.util.List;
+import com.google.common.collect.Lists;
 
 public class HashJoinPrel  extends JoinPrel {
 

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
index 8588425..61321c1 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashJoinPrule.java
@@ -17,6 +17,8 @@
  */
 package org.apache.drill.exec.planner.physical;
 
+import java.util.logging.Logger;
+
 import org.apache.drill.exec.planner.logical.DrillJoinRel;
 import org.apache.drill.exec.planner.logical.RelOptHelper;
 import org.eigenbase.rel.InvalidRelException;
@@ -25,8 +27,6 @@ import org.eigenbase.relopt.RelOptRule;
 import org.eigenbase.relopt.RelOptRuleCall;
 import org.eigenbase.trace.EigenbaseTrace;
 
-import java.util.logging.Logger;
-
 public class HashJoinPrule extends JoinPruleBase {
   public static final RelOptRule INSTANCE = new HashJoinPrule();
   protected static final Logger tracer = EigenbaseTrace.getPlannerTracer();
@@ -41,7 +41,7 @@ public class HashJoinPrule extends JoinPruleBase {
     PlannerSettings settings = PrelUtil.getPlannerSettings(call.getPlanner());
     return settings.isMemoryEstimationEnabled() || settings.isHashJoinEnabled();
   }
-  
+
   @Override
   public void onMatch(RelOptRuleCall call) {
     if (!PrelUtil.getPlannerSettings(call.getPlanner()).isHashJoinEnabled()) return;
@@ -49,23 +49,23 @@ public class HashJoinPrule extends JoinPruleBase {
     final DrillJoinRel join = (DrillJoinRel) call.rel(0);
     final RelNode left = join.getLeft();
     final RelNode right = join.getRight();
-    
+
     if (!checkPreconditions(join, left, right)) {
       return;
     }
-    
+
     boolean hashSingleKey = PrelUtil.getPlannerSettings(call.getPlanner()).isHashSingleKey();
-    
+
     try {
 
       createDistBothPlan(call, join, PhysicalJoinType.HASH_JOIN, left, right, null /* left collation */, null /* right collation */, hashSingleKey);
-      
+
       if (checkBroadcastConditions(call.getPlanner(), join, left, right)) {
         createBroadcastPlan(call, join, PhysicalJoinType.HASH_JOIN, left, right, null /* left collation */, null /* right collation */);
 
         // createBroadcastPlan1(call, join, PhysicalJoinType.HASH_JOIN, left, right, null, null);
       }
-      
+
     } catch (InvalidRelException e) {
       tracer.warning(e.toString());
     }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToMergeExchangePrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToMergeExchangePrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToMergeExchangePrel.java
index 4518e17..95ef876 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToMergeExchangePrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToMergeExchangePrel.java
@@ -18,25 +18,21 @@
 package org.apache.drill.exec.planner.physical;
 
 import java.io.IOException;
-import java.util.Iterator;
 import java.util.List;
 
 import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.HashToMergeExchange;
-import org.apache.drill.exec.physical.config.SelectionVectorRemover;
 import org.apache.drill.exec.planner.cost.DrillCostBase;
 import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
 import org.apache.drill.exec.planner.physical.DrillDistributionTrait.DistributionField;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelCollation;
 import org.eigenbase.rel.RelNode;
-import org.eigenbase.rel.SingleRel;
 import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelOptCost;
 import org.eigenbase.relopt.RelOptPlanner;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.reltype.RelDataTypeField;
 
 
 public class HashToMergeExchangePrel extends ExchangePrel {

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
index b78e64c..30107bb 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/HashToRandomExchangePrel.java
@@ -24,21 +24,17 @@ import net.hydromatic.linq4j.Ord;
 
 import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.HashToRandomExchange;
-import org.apache.drill.exec.physical.config.SelectionVectorRemover;
 import org.apache.drill.exec.planner.cost.DrillCostBase;
 import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
 import org.apache.drill.exec.planner.physical.DrillDistributionTrait.DistributionField;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.rel.RelWriter;
-import org.eigenbase.rel.SingleRel;
 import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelOptCost;
 import org.eigenbase.relopt.RelOptPlanner;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.reltype.RelDataTypeField;
-import org.eigenbase.rex.RexNode;
 
 
 public class HashToRandomExchangePrel extends ExchangePrel {
@@ -57,8 +53,8 @@ public class HashToRandomExchangePrel extends ExchangePrel {
    * If there are N nodes (endpoints), we can assume for costing purposes
    * on average each sender will send M/N rows to 1 destination endpoint.
    * (See DrillCostBase for symbol notations)
-   * Include impact of skewness of distribution : the more keys used, the less likely the distribution will be skewed. 
-   * The hash cpu cost will be proportional to 1 / #_keys. 
+   * Include impact of skewness of distribution : the more keys used, the less likely the distribution will be skewed.
+   * The hash cpu cost will be proportional to 1 / #_keys.
    * C =  CPU cost of hashing k fields of M/N rows
    *      + CPU cost of SV remover for M/N rows
    *      + Network cost of sending M/N rows to 1 destination.

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPrel.java
index cf996dc..d5473f2 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPrel.java
@@ -99,6 +99,6 @@ public abstract class JoinPrel extends DrillJoinRelBase implements Prel{
   @Override
   public boolean needsFinalColumnReordering() {
     return true;
-  }  
-  
+  }
+
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
index d6bd711..babf005 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/JoinPruleBase.java
@@ -28,12 +28,10 @@ import org.eigenbase.rel.RelCollation;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptPlanner;
-import org.eigenbase.relopt.RelOptRule;
 import org.eigenbase.relopt.RelOptRuleCall;
 import org.eigenbase.relopt.RelOptRuleOperand;
 import org.eigenbase.relopt.RelOptUtil;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.relopt.volcano.RelSubset;
 import org.eigenbase.rex.RexNode;
 
 import com.google.common.collect.ImmutableList;
@@ -189,6 +187,7 @@ public abstract class JoinPruleBase extends Prule {
 
     new SubsetTransformer<DrillJoinRel, InvalidRelException>(call){
 
+      @Override
       public RelNode convertChild(final DrillJoinRel join, final RelNode rel) throws InvalidRelException {
         DrillDistributionTrait toDist = rel.getTraitSet().getTrait(DrillDistributionTraitDef.INSTANCE);
         RelTraitSet newTraitsLeft;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrel.java
index a4bb503..5060195 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrel.java
@@ -18,28 +18,19 @@
 package org.apache.drill.exec.planner.physical;
 
 import java.io.IOException;
-import java.math.BigDecimal;
 import java.util.Iterator;
 import java.util.List;
 
-import org.apache.drill.common.logical.data.LogicalOperator;
 import org.apache.drill.exec.physical.base.PhysicalOperator;
-import org.apache.drill.exec.physical.config.Filter;
 import org.apache.drill.exec.physical.config.Limit;
 import org.apache.drill.exec.planner.common.DrillLimitRelBase;
-import org.apache.drill.exec.planner.logical.DrillImplementor;
-import org.apache.drill.exec.planner.logical.DrillParseContext;
-import org.apache.drill.exec.planner.logical.DrillRel;
 import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
-import org.apache.drill.exec.planner.torel.ConversionContext;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
-import org.eigenbase.rel.InvalidRelException;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelTraitSet;
 import org.eigenbase.rex.RexLiteral;
 import org.eigenbase.rex.RexNode;
-import org.eigenbase.sql.type.SqlTypeName;
 
 public class LimitPrel extends DrillLimitRelBase implements Prel {
 
@@ -93,7 +84,7 @@ public class LimitPrel extends DrillLimitRelBase implements Prel {
   public boolean needsFinalColumnReordering() {
     return true;
   }
-  
+
 //  @Override
 //  public LogicalOperator implement(DrillImplementor implementor) {
 //    LogicalOperator inputOp = implementor.visitChild(this, 0, getChild());

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrule.java
index aad2976..94685c1 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/LimitPrule.java
@@ -17,10 +17,8 @@
  */
 package org.apache.drill.exec.planner.physical;
 
-import org.apache.drill.exec.planner.common.DrillScreenRelBase;
 import org.apache.drill.exec.planner.logical.DrillLimitRel;
 import org.apache.drill.exec.planner.logical.DrillRel;
-import org.apache.drill.exec.planner.logical.DrillScreenRel;
 import org.apache.drill.exec.planner.logical.RelOptHelper;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptRule;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
index a11e389..faffa63 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/MergeJoinPrule.java
@@ -27,14 +27,10 @@ import org.eigenbase.rel.RelCollation;
 import org.eigenbase.rel.RelCollationImpl;
 import org.eigenbase.rel.RelFieldCollation;
 import org.eigenbase.rel.RelNode;
-import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptRule;
 import org.eigenbase.relopt.RelOptRuleCall;
-import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.relopt.volcano.RelSubset;
 import org.eigenbase.trace.EigenbaseTrace;
 
-import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Lists;
 
 public class MergeJoinPrule extends JoinPruleBase {
@@ -51,7 +47,7 @@ public class MergeJoinPrule extends JoinPruleBase {
   public boolean matches(RelOptRuleCall call) {
     return PrelUtil.getPlannerSettings(call.getPlanner()).isMergeJoinEnabled();
   }
-  
+
   @Override
   public void onMatch(RelOptRuleCall call) {
     final DrillJoinRel join = (DrillJoinRel) call.rel(0);
@@ -61,10 +57,10 @@ public class MergeJoinPrule extends JoinPruleBase {
     if (!checkPreconditions(join, left, right)) {
       return;
     }
-    
+
     boolean hashSingleKey = PrelUtil.getPlannerSettings(call.getPlanner()).isHashSingleKey();
-    
-    try {            
+
+    try {
       RelCollation collationLeft = getCollation(join.getLeftKeys());
       RelCollation collationRight = getCollation(join.getRightKeys());
 
@@ -78,8 +74,8 @@ public class MergeJoinPrule extends JoinPruleBase {
       tracer.warning(e.toString());
     }
   }
-  
-  private RelCollation getCollation(List<Integer> keys){    
+
+  private RelCollation getCollation(List<Integer> keys){
     List<RelFieldCollation> fields = Lists.newArrayList();
     for (int key : keys) {
       fields.add(new RelFieldCollation(key));

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/OrderedPartitionExchangePrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/OrderedPartitionExchangePrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/OrderedPartitionExchangePrel.java
index 36a67cb..7bb4822 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/OrderedPartitionExchangePrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/OrderedPartitionExchangePrel.java
@@ -18,7 +18,6 @@
 package org.apache.drill.exec.planner.physical;
 
 import java.io.IOException;
-import java.util.Iterator;
 import java.util.List;
 
 import org.apache.drill.exec.physical.base.PhysicalOperator;
@@ -26,7 +25,6 @@ import org.apache.drill.exec.planner.cost.DrillCostBase;
 import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
-import org.eigenbase.rel.SingleRel;
 import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelOptCost;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PhysicalPlanCreator.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PhysicalPlanCreator.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PhysicalPlanCreator.java
index 130ac87..6094221 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PhysicalPlanCreator.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/PhysicalPlanCreator.java
@@ -31,7 +31,6 @@ import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.planner.physical.explain.PrelSequencer.OpId;
 
 import com.google.common.collect.Lists;
-import com.google.common.collect.Maps;
 
 
 public class PhysicalPlanCreator {

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProducerConsumerPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProducerConsumerPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProducerConsumerPrel.java
index 6903767..a9edd0c 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProducerConsumerPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProducerConsumerPrel.java
@@ -17,6 +17,10 @@
  */
 package org.apache.drill.exec.planner.physical;
 
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.List;
+
 import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.ProducerConsumer;
 import org.apache.drill.exec.planner.common.DrillRelNode;
@@ -24,13 +28,8 @@ import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.rel.SingleRel;
-import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelTraitSet;
 
-import java.io.IOException;
-import java.util.Iterator;
-import java.util.List;
-
 public class ProducerConsumerPrel extends SingleRel implements DrillRelNode, Prel {
 
   private int queueSize;
@@ -75,10 +74,10 @@ public class ProducerConsumerPrel extends SingleRel implements DrillRelNode, Pre
   public SelectionVectorMode getEncoding() {
     return SelectionVectorMode.NONE;
   }
-  
+
   @Override
   public boolean needsFinalColumnReordering() {
     return true;
   }
-  
+
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectAllowDupPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectAllowDupPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectAllowDupPrel.java
index a67dbf2..57dfdb4 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectAllowDupPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectAllowDupPrel.java
@@ -28,7 +28,6 @@ import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.Project;
 import org.apache.drill.exec.planner.logical.DrillOptiq;
 import org.apache.drill.exec.planner.logical.DrillParseContext;
-import org.apache.drill.exec.planner.physical.ProjectPrel;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelTraitSet;
@@ -55,6 +54,7 @@ public class ProjectAllowDupPrel extends ProjectPrel {
     return creator.addMetadata(this, p);
   }
 
+  @Override
   protected List<NamedExpression> getProjectExpressions(DrillParseContext context) {
     List<NamedExpression> expressions = Lists.newArrayList();
     for (Pair<RexNode, String> pair : Pair.zip(exps, getRowType().getFieldNames())) {

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrel.java
index ae21c2c..1f621da 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrel.java
@@ -18,14 +18,11 @@
 package org.apache.drill.exec.planner.physical;
 
 import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collections;
 import java.util.Iterator;
 import java.util.List;
 
 import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.Project;
-import org.apache.drill.exec.physical.config.SelectionVectorRemover;
 import org.apache.drill.exec.planner.common.DrillProjectRelBase;
 import org.apache.drill.exec.planner.logical.DrillParseContext;
 import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
@@ -46,6 +43,7 @@ public class ProjectPrel extends DrillProjectRelBase implements Prel{
     super(DRILL_PHYSICAL, cluster, traits, child, exps, rowType);
   }
 
+  @Override
   public ProjectRelBase copy(RelTraitSet traitSet, RelNode input, List<RexNode> exps, RelDataType rowType) {
     return new ProjectPrel(getCluster(), traitSet, input, exps, rowType);
   }
@@ -85,5 +83,5 @@ public class ProjectPrel extends DrillProjectRelBase implements Prel{
   public boolean needsFinalColumnReordering() {
     return false;
   }
-  
+
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrule.java
index 833aaae..6d26419 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ProjectPrule.java
@@ -35,7 +35,6 @@ import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptRule;
 import org.eigenbase.relopt.RelOptRuleCall;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.relopt.volcano.RelSubset;
 import org.eigenbase.rex.RexCall;
 import org.eigenbase.rex.RexInputRef;
 import org.eigenbase.rex.RexNode;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScanPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScanPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScanPrule.java
index 606bbcb..1d915b7 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScanPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScanPrule.java
@@ -17,9 +17,6 @@
  */
 package org.apache.drill.exec.planner.physical;
 
-import java.util.List;
-
-import org.apache.drill.common.expression.SchemaPath;
 import org.apache.drill.exec.physical.base.GroupScan;
 import org.apache.drill.exec.planner.logical.DrillScanRel;
 import org.apache.drill.exec.planner.logical.RelOptHelper;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScreenPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScreenPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScreenPrel.java
index 1a4da8a..4356515 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScreenPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/ScreenPrel.java
@@ -23,7 +23,6 @@ import java.util.List;
 
 import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.Screen;
-import org.apache.drill.exec.physical.config.SelectionVectorRemover;
 import org.apache.drill.exec.planner.common.DrillScreenRelBase;
 import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
@@ -74,7 +73,7 @@ public class ScreenPrel extends DrillScreenRelBase implements Prel {
   public SelectionVectorMode getEncoding() {
     return SelectionVectorMode.NONE;
   }
-  
+
   @Override
   public boolean needsFinalColumnReordering() {
     return false;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SelectionVectorRemoverPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SelectionVectorRemoverPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SelectionVectorRemoverPrel.java
index 042809f..aea5192 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SelectionVectorRemoverPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SelectionVectorRemoverPrel.java
@@ -26,8 +26,6 @@ import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.reltype.RelDataType;
-import org.eigenbase.rex.RexNode;
 
 public class SelectionVectorRemoverPrel extends SinglePrel{
   static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(SelectionVectorRemoverPrel.class);
@@ -40,6 +38,7 @@ public class SelectionVectorRemoverPrel extends SinglePrel{
     super(cluster, traits, child);
   }
 
+  @Override
   public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
     return new SelectionVectorRemoverPrel(this.getCluster(), traitSet, inputs.get(0));
   }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SingleMergeExchangePrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SingleMergeExchangePrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SingleMergeExchangePrel.java
index bea5500..16bfd88 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SingleMergeExchangePrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SingleMergeExchangePrel.java
@@ -31,7 +31,6 @@ import org.eigenbase.rel.RelCollation;
 import org.eigenbase.rel.RelFieldCollation;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.rel.RelWriter;
-import org.eigenbase.rel.SingleRel;
 import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelOptCost;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SinglePrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SinglePrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SinglePrel.java
index 3199943..914ee04 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SinglePrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SinglePrel.java
@@ -17,7 +17,6 @@
  */
 package org.apache.drill.exec.planner.physical;
 
-import java.util.Collections;
 import java.util.Iterator;
 
 import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortConvertPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortConvertPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortConvertPrule.java
index f2723cf..a9955a3 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortConvertPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortConvertPrule.java
@@ -17,8 +17,6 @@
  */
 package org.apache.drill.exec.planner.physical;
 
-import org.apache.drill.exec.planner.logical.DrillRel;
-import org.apache.drill.exec.planner.logical.DrillSortRel;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.rel.SortRel;
 import org.eigenbase.rel.convert.ConverterRule;
@@ -28,9 +26,9 @@ import org.eigenbase.relopt.RelOptRuleCall;
 
 /**
  * Rule that converts an {@link SortRel} to a physical {@link SortPrel}, implemented by a Drill "order" operation.
- * 
- * The {@link SortRel} is added in optiq's AbstractConvert call, when it enforces certain "order" to the input stream. 
- * Drill uses this rule to convert such sort enforcer into physical {@link SortPrel}. 
+ *
+ * The {@link SortRel} is added in optiq's AbstractConvert call, when it enforces certain "order" to the input stream.
+ * Drill uses this rule to convert such sort enforcer into physical {@link SortPrel}.
  */
 public class SortConvertPrule extends ConverterRule {
   public static final RelOptRule INSTANCE = new SortConvertPrule("SortConvertPrule", Convention.NONE);
@@ -49,9 +47,9 @@ public class SortConvertPrule extends ConverterRule {
   @Override
   public RelNode convert(RelNode r) {
     SortRel rel = (SortRel) r;
-    return new SortPrel(rel.getCluster(), 
-                        rel.getChild().getTraitSet().replace(Prel.DRILL_PHYSICAL).plus(rel.getCollation()), 
-                        convert(rel.getChild(), rel.getChild().getTraitSet().replace(Prel.DRILL_PHYSICAL)), 
+    return new SortPrel(rel.getCluster(),
+                        rel.getChild().getTraitSet().replace(Prel.DRILL_PHYSICAL).plus(rel.getCollation()),
+                        convert(rel.getChild(), rel.getChild().getTraitSet().replace(Prel.DRILL_PHYSICAL)),
                         rel.getCollation());
   }
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrel.java
index 0926f60..8156843 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrel.java
@@ -17,6 +17,9 @@
  */
 package org.apache.drill.exec.planner.physical;
 
+import java.io.IOException;
+import java.util.Iterator;
+
 import org.apache.drill.exec.ExecConstants;
 import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.ExternalSort;
@@ -35,9 +38,6 @@ import org.eigenbase.relopt.RelOptPlanner;
 import org.eigenbase.relopt.RelTraitSet;
 import org.eigenbase.rex.RexNode;
 
-import java.io.IOException;
-import java.util.Iterator;
-
 public class SortPrel extends SortRel implements Prel {
 
   /** Creates a DrillSortRel. */
@@ -86,6 +86,7 @@ public class SortPrel extends SortRel implements Prel {
     return creator.addMetadata(this, g);
   }
 
+  @Override
   public SortPrel copy(
       RelTraitSet traitSet,
       RelNode newInput,
@@ -114,10 +115,10 @@ public class SortPrel extends SortRel implements Prel {
   public SelectionVectorMode getEncoding() {
     return SelectionVectorMode.FOUR_BYTE;
   }
-  
+
   @Override
   public boolean needsFinalColumnReordering() {
     return true;
   }
-  
+
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrule.java
index 94b70c4..2ebd015 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/SortPrule.java
@@ -19,17 +19,12 @@ package org.apache.drill.exec.planner.physical;
 
 import java.util.List;
 
-import net.hydromatic.optiq.util.BitSets;
-
-import org.apache.drill.exec.planner.common.DrillProjectRelBase;
-import org.apache.drill.exec.planner.logical.DrillAggregateRel;
 import org.apache.drill.exec.planner.logical.DrillRel;
 import org.apache.drill.exec.planner.logical.DrillSortRel;
 import org.apache.drill.exec.planner.logical.RelOptHelper;
 import org.apache.drill.exec.planner.physical.DrillDistributionTrait.DistributionField;
 import org.eigenbase.rel.RelFieldCollation;
 import org.eigenbase.rel.RelNode;
-import org.eigenbase.rel.SortRel;
 import org.eigenbase.relopt.RelOptRule;
 import org.eigenbase.relopt.RelOptRuleCall;
 import org.eigenbase.relopt.RelTraitSet;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrel.java
index eaef94b..e8a70f2 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrel.java
@@ -27,7 +27,6 @@ import org.apache.drill.exec.physical.base.PhysicalOperator;
 import org.apache.drill.exec.physical.config.StreamingAggregate;
 import org.apache.drill.exec.planner.cost.DrillCostBase;
 import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
-import org.apache.drill.exec.planner.logical.DrillParseContext;
 import org.apache.drill.exec.planner.physical.visitor.PrelVisitor;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.AggregateCall;
@@ -51,6 +50,7 @@ public class StreamAggPrel extends AggPrelBase implements Prel{
     super(cluster, traits, child, groupSet, aggCalls, phase);
   }
 
+  @Override
   public AggregateRelBase copy(RelTraitSet traitSet, RelNode input, BitSet groupSet, List<AggregateCall> aggCalls) {
     try {
       return new StreamAggPrel(getCluster(), traitSet, input, getGroupSet(), aggCalls,

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrule.java
index b5b0364..89b133a 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/StreamAggPrule.java
@@ -23,7 +23,6 @@ import java.util.logging.Logger;
 import net.hydromatic.optiq.util.BitSets;
 
 import org.apache.drill.exec.planner.logical.DrillAggregateRel;
-import org.apache.drill.exec.planner.logical.DrillJoinRel;
 import org.apache.drill.exec.planner.logical.RelOptHelper;
 import org.apache.drill.exec.planner.physical.AggPrelBase.OperatorPhase;
 import org.eigenbase.rel.InvalidRelException;
@@ -34,7 +33,6 @@ import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptRule;
 import org.eigenbase.relopt.RelOptRuleCall;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.relopt.volcano.RelSubset;
 import org.eigenbase.trace.EigenbaseTrace;
 
 import com.google.common.collect.ImmutableList;
@@ -76,6 +74,7 @@ public class StreamAggPrule extends AggPruleBase {
           RelNode convertedInput = convert(input, traits);
           new SubsetTransformer<DrillAggregateRel, InvalidRelException>(call){
 
+            @Override
             public RelNode convertChild(final DrillAggregateRel join, final RelNode rel) throws InvalidRelException {
               DrillDistributionTrait toDist = rel.getTraitSet().getTrait(DrillDistributionTraitDef.INSTANCE);
               RelTraitSet traits = newTraitSet(Prel.DRILL_PHYSICAL, toDist);
@@ -127,6 +126,7 @@ public class StreamAggPrule extends AggPruleBase {
 
           new SubsetTransformer<DrillAggregateRel, InvalidRelException>(call){
 
+            @Override
             public RelNode convertChild(final DrillAggregateRel aggregate, final RelNode rel) throws InvalidRelException {
               DrillDistributionTrait toDist = rel.getTraitSet().getTrait(DrillDistributionTraitDef.INSTANCE);
               RelTraitSet traits = newTraitSet(Prel.DRILL_PHYSICAL, collation, toDist);

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/TopNPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/TopNPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/TopNPrel.java
index 997c1c7..ac1811b 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/TopNPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/TopNPrel.java
@@ -18,7 +18,6 @@
 package org.apache.drill.exec.planner.physical;
 
 import java.io.IOException;
-import java.util.Iterator;
 import java.util.List;
 
 import org.apache.drill.exec.physical.base.PhysicalOperator;
@@ -29,14 +28,11 @@ import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelCollation;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.rel.RelWriter;
-import org.eigenbase.rel.SingleRel;
 import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelOptCost;
 import org.eigenbase.relopt.RelOptPlanner;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.rex.RexLiteral;
-import org.eigenbase.rex.RexNode;
 
 public class TopNPrel extends SinglePrel {
 

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionAllPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionAllPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionAllPrule.java
index bcddce6..869493f 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionAllPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionAllPrule.java
@@ -43,27 +43,27 @@ public class UnionAllPrule extends Prule {
   @Override
   public boolean matches(RelOptRuleCall call) {
     DrillUnionRel union = (DrillUnionRel) call.rel(0);
-    return (! union.isDistinct()); 
+    return (! union.isDistinct());
   }
-  
+
   @Override
   public void onMatch(RelOptRuleCall call) {
     final DrillUnionRel union = (DrillUnionRel) call.rel(0);
     final List<RelNode> inputs = union.getInputs();
     List<RelNode> convertedInputList = Lists.newArrayList();
     RelTraitSet traits = call.getPlanner().emptyTraitSet().plus(Prel.DRILL_PHYSICAL);
-    
+
     try {
       for (int i = 0; i < inputs.size(); i++) {
         RelNode convertedInput = convert(inputs.get(i), PrelUtil.fixTraits(call, traits));
-        convertedInputList.add(convertedInput);    
+        convertedInputList.add(convertedInput);
       }
-      
+
       traits = call.getPlanner().emptyTraitSet().plus(Prel.DRILL_PHYSICAL).plus(DrillDistributionTrait.SINGLETON);
       UnionAllPrel unionAll = new UnionAllPrel(union.getCluster(), traits, convertedInputList);
 
       call.transformTo(unionAll);
-      
+
     } catch (InvalidRelException e) {
       tracer.warning(e.toString());
     }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionDistinctPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionDistinctPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionDistinctPrule.java
index 7cd5733..67a817e 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionDistinctPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionDistinctPrule.java
@@ -45,25 +45,25 @@ public class UnionDistinctPrule extends Prule {
     DrillUnionRel union = (DrillUnionRel) call.rel(0);
     return (union.isDistinct() && union.isHomogeneous(false /* don't compare names */));
   }
-  
+
   @Override
   public void onMatch(RelOptRuleCall call) {
     final DrillUnionRel union = (DrillUnionRel) call.rel(0);
     final List<RelNode> inputs = union.getInputs();
     List<RelNode> convertedInputList = Lists.newArrayList();
     RelTraitSet traits = call.getPlanner().emptyTraitSet().plus(Prel.DRILL_PHYSICAL);
-    
+
     try {
       for (int i = 0; i < inputs.size(); i++) {
         RelNode convertedInput = convert(inputs.get(i), PrelUtil.fixTraits(call, traits));
-        convertedInputList.add(convertedInput);    
+        convertedInputList.add(convertedInput);
       }
-      
+
       traits = call.getPlanner().emptyTraitSet().plus(Prel.DRILL_PHYSICAL).plus(DrillDistributionTrait.SINGLETON);
       UnionDistinctPrel unionDistinct = new UnionDistinctPrel(union.getCluster(), traits, convertedInputList);
 
       call.transformTo(unionDistinct);
-      
+
     } catch (InvalidRelException e) {
       tracer.warning(e.toString());
     }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionExchangePrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionExchangePrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionExchangePrel.java
index 3fd6e32..8b0c251 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionExchangePrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionExchangePrel.java
@@ -21,14 +21,11 @@ import java.io.IOException;
 import java.util.List;
 
 import org.apache.drill.exec.physical.base.PhysicalOperator;
-import org.apache.drill.exec.physical.config.Screen;
-import org.apache.drill.exec.physical.config.SelectionVectorRemover;
 import org.apache.drill.exec.physical.config.UnionExchange;
 import org.apache.drill.exec.planner.cost.DrillCostBase;
 import org.apache.drill.exec.planner.cost.DrillCostBase.DrillCostFactory;
 import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
-import org.eigenbase.rel.SingleRel;
 import org.eigenbase.rel.metadata.RelMetadataQuery;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelOptCost;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionPrel.java
index dd1d018..a1f300b 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/UnionPrel.java
@@ -27,7 +27,6 @@ import org.eigenbase.rel.InvalidRelException;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.reltype.RelDataType;
 
 public abstract class UnionPrel extends DrillUnionRelBase implements Prel{
 
@@ -44,7 +43,7 @@ public abstract class UnionPrel extends DrillUnionRelBase implements Prel{
   public Iterator<Prel> iterator() {
     return PrelUtil.iter(this.getInputs());
   }
-  
+
   @Override
   public boolean needsFinalColumnReordering() {
     return false;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrel.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrel.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrel.java
index d9db36e..dc3d6df 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrel.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrel.java
@@ -29,11 +29,6 @@ import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
 import org.eigenbase.relopt.RelOptCluster;
 import org.eigenbase.relopt.RelTraitSet;
-import org.eigenbase.reltype.RelDataType;
-import org.eigenbase.sql.type.SqlTypeName;
-
-import com.google.common.collect.ImmutableList;
-import com.google.common.collect.Lists;
 
 public class WriterPrel extends DrillWriterRelBase implements Prel {
 
@@ -77,10 +72,10 @@ public class WriterPrel extends DrillWriterRelBase implements Prel {
   public SelectionVectorMode getEncoding() {
     return SelectionVectorMode.NONE;
   }
-  
+
   @Override
   public boolean needsFinalColumnReordering() {
     return true;
   }
-  
+
 }

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrule.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrule.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrule.java
index f3057e6..6bd89b0 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrule.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/WriterPrule.java
@@ -60,11 +60,11 @@ public class WriterPrule extends Prule{
     public RelNode convertChild(DrillWriterRelBase writer, RelNode rel) throws RuntimeException {
       DrillDistributionTrait childDist = rel.getTraitSet().getTrait(DrillDistributionTraitDef.INSTANCE);
 
-      // Create the Writer with the child's distribution because the degree of parallelism for the writer 
-      // should correspond to the number of child minor fragments. The Writer itself is not concerned with 
-      // the collation of the child.  Note that the Writer's output RowType consists of 
-      // {fragment_id varchar(255), number_of_records_written bigint} which are very different from the 
-      // child's output RowType. 
+      // Create the Writer with the child's distribution because the degree of parallelism for the writer
+      // should correspond to the number of child minor fragments. The Writer itself is not concerned with
+      // the collation of the child.  Note that the Writer's output RowType consists of
+      // {fragment_id varchar(255), number_of_records_written bigint} which are very different from the
+      // child's output RowType.
       return new WriterPrel(writer.getCluster(),
           writer.getTraitSet().plus(childDist).plus(Prel.DRILL_PHYSICAL),
           rel, writer.getCreateTableEntry());

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/explain/PrelSequencer.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/explain/PrelSequencer.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/explain/PrelSequencer.java
index ebff287..c3020cf 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/explain/PrelSequencer.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/explain/PrelSequencer.java
@@ -25,7 +25,6 @@ import java.util.Map;
 import java.util.Queue;
 
 import org.apache.drill.exec.planner.physical.ExchangePrel;
-import org.apache.drill.exec.planner.physical.JoinPrel;
 import org.apache.drill.exec.planner.physical.Prel;
 import org.apache.drill.exec.planner.physical.visitor.BasePrelVisitor;
 import org.eigenbase.rel.RelWriter;

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ExcessiveExchangeIdentifier.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ExcessiveExchangeIdentifier.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ExcessiveExchangeIdentifier.java
index 06b72f9..eb8eab3 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ExcessiveExchangeIdentifier.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ExcessiveExchangeIdentifier.java
@@ -25,7 +25,6 @@ import org.apache.drill.exec.planner.physical.Prel;
 import org.apache.drill.exec.planner.physical.ScanPrel;
 import org.apache.drill.exec.planner.physical.ScreenPrel;
 import org.eigenbase.rel.RelNode;
-import org.eigenbase.relopt.RelOptCost;
 
 import com.google.common.collect.Lists;
 

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/FinalColumnReorderer.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/FinalColumnReorderer.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/FinalColumnReorderer.java
index 85f5ba3..c0556e3 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/FinalColumnReorderer.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/FinalColumnReorderer.java
@@ -47,11 +47,11 @@ public class FinalColumnReorderer extends BasePrelVisitor<Prel, Void, RuntimeExc
   }
 
   private Prel addTrivialOrderedProjectPrel(Prel prel){
-    
+
     if ( !prel.needsFinalColumnReordering()) {
       return prel;
     }
-    
+
     RelDataType t = prel.getRowType();
 
     RexBuilder b = prel.getCluster().getRexBuilder();

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ProducerConsumerPrelVisitor.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ProducerConsumerPrelVisitor.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ProducerConsumerPrelVisitor.java
index 575b4b4..2cbf790 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ProducerConsumerPrelVisitor.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/ProducerConsumerPrelVisitor.java
@@ -17,15 +17,14 @@
  */
 package org.apache.drill.exec.planner.physical.visitor;
 
-import com.google.common.collect.Lists;
+import java.util.List;
+
 import org.apache.drill.exec.planner.physical.Prel;
 import org.apache.drill.exec.planner.physical.ProducerConsumerPrel;
 import org.apache.drill.exec.planner.physical.ScanPrel;
-import org.apache.drill.exec.planner.physical.SelectionVectorRemoverPrel;
-import org.apache.drill.exec.record.BatchSchema.SelectionVectorMode;
 import org.eigenbase.rel.RelNode;
 
-import java.util.List;
+import com.google.common.collect.Lists;
 
 
 public class ProducerConsumerPrelVisitor extends BasePrelVisitor<Prel, Void, RuntimeException>{

http://git-wip-us.apache.org/repos/asf/incubator-drill/blob/39990292/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/RelUniqifier.java
----------------------------------------------------------------------
diff --git a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/RelUniqifier.java b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/RelUniqifier.java
index c5bf293..4f7f348 100644
--- a/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/RelUniqifier.java
+++ b/exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/RelUniqifier.java
@@ -23,8 +23,8 @@ import java.util.Set;
 import org.apache.drill.exec.planner.physical.Prel;
 import org.eigenbase.rel.RelNode;
 
-import com.google.common.collect.Sets;
 import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
 
 public class RelUniqifier extends BasePrelVisitor<Prel, Set<Prel>, RuntimeException>{
   static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(RelUniqifier.class);