diff --git a/hyracks-api/src/main/java/edu/uci/ics/hyracks/api/dataflow/value/ILinearizeComparatorFactory.java b/hyracks-api/src/main/java/edu/uci/ics/hyracks/api/dataflow/value/ILinearizeComparatorFactory.java
index 49a661f..79619c4 100644
--- a/hyracks-api/src/main/java/edu/uci/ics/hyracks/api/dataflow/value/ILinearizeComparatorFactory.java
+++ b/hyracks-api/src/main/java/edu/uci/ics/hyracks/api/dataflow/value/ILinearizeComparatorFactory.java
@@ -14,7 +14,6 @@
  */
 package edu.uci.ics.hyracks.api.dataflow.value;
 
-import java.io.Serializable;
 
 public interface ILinearizeComparatorFactory extends IBinaryComparatorFactory {
     public ILinearizeComparator createBinaryComparator();
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeOperatorTestHelper.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeOperatorTestHelper.java
index 3418e0b..5aa7bd2 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeOperatorTestHelper.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeOperatorTestHelper.java
@@ -16,13 +16,14 @@
 package edu.uci.ics.hyracks.tests.am.lsm.rtree;
 
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.control.nc.io.IOManager;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexDataflowHelperFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.ConstantMergePolicyProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.FlushControllerProvider;
-import edu.uci.ics.hyracks.storage.am.lsm.common.impls.RefCountingOperationTrackerProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.ImmediateSchedulerProvider;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.RefCountingOperationTrackerProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.dataflow.LSMRTreeDataflowHelperFactory;
 import edu.uci.ics.hyracks.storage.am.rtree.frames.RTreePolicyType;
 import edu.uci.ics.hyracks.tests.am.common.LSMTreeOperatorTestHelper;
@@ -37,11 +38,11 @@
 
     public IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) {
         return new LSMRTreeDataflowHelperFactory(valueProviderFactories, rtreePolicyType, btreeComparatorFactories,
                 new FlushControllerProvider(), new ConstantMergePolicyProvider(ImmediateSchedulerProvider.INSTANCE,
                         MERGE_THRESHOLD), new RefCountingOperationTrackerProvider(),
-                ImmediateSchedulerProvider.INSTANCE);
+                ImmediateSchedulerProvider.INSTANCE, linearizerCmpFactory);
     }
 
 }
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeSecondaryIndexInsertOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeSecondaryIndexInsertOperatorTest.java
index 5778f9b..99eb6c3 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeSecondaryIndexInsertOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeSecondaryIndexInsertOperatorTest.java
@@ -16,6 +16,7 @@
 package edu.uci.ics.hyracks.tests.am.lsm.rtree;
 
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksException;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexDataflowHelperFactory;
@@ -32,8 +33,8 @@
     @Override
     protected IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) {
         return ((LSMRTreeOperatorTestHelper) testHelper).createDataFlowHelperFactory(secondaryValueProviderFactories,
-                rtreePolicyType, btreeComparatorFactories);
+                rtreePolicyType, btreeComparatorFactories, linearizerCmpFactory);
     }
 }
\ No newline at end of file
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeSecondaryIndexSearchOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeSecondaryIndexSearchOperatorTest.java
index 0bb8711..e1e6b04 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeSecondaryIndexSearchOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeSecondaryIndexSearchOperatorTest.java
@@ -16,6 +16,7 @@
 package edu.uci.ics.hyracks.tests.am.lsm.rtree;
 
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksException;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexDataflowHelperFactory;
@@ -32,8 +33,8 @@
     @Override
     protected IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) {
         return ((LSMRTreeOperatorTestHelper) testHelper).createDataFlowHelperFactory(secondaryValueProviderFactories,
-                rtreePolicyType, btreeComparatorFactories);
+                rtreePolicyType, btreeComparatorFactories, linearizerCmpFactory);
     }
 }
\ No newline at end of file
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesOperatorTestHelper.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesOperatorTestHelper.java
index 468c7ef..82a7eb6 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesOperatorTestHelper.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesOperatorTestHelper.java
@@ -16,13 +16,14 @@
 package edu.uci.ics.hyracks.tests.am.lsm.rtree;
 
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.control.nc.io.IOManager;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexDataflowHelperFactory;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.ConstantMergePolicyProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.FlushControllerProvider;
-import edu.uci.ics.hyracks.storage.am.lsm.common.impls.RefCountingOperationTrackerProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.common.impls.ImmediateSchedulerProvider;
+import edu.uci.ics.hyracks.storage.am.lsm.common.impls.RefCountingOperationTrackerProvider;
 import edu.uci.ics.hyracks.storage.am.lsm.rtree.dataflow.LSMRTreeWithAntiMatterTuplesDataflowHelperFactory;
 import edu.uci.ics.hyracks.storage.am.rtree.frames.RTreePolicyType;
 import edu.uci.ics.hyracks.tests.am.common.LSMTreeOperatorTestHelper;
@@ -37,11 +38,11 @@
 
     public IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) {
         return new LSMRTreeWithAntiMatterTuplesDataflowHelperFactory(valueProviderFactories, rtreePolicyType,
                 btreeComparatorFactories, new FlushControllerProvider(), new ConstantMergePolicyProvider(
                         ImmediateSchedulerProvider.INSTANCE, MERGE_THRESHOLD),
-                new RefCountingOperationTrackerProvider(), ImmediateSchedulerProvider.INSTANCE);
+                new RefCountingOperationTrackerProvider(), ImmediateSchedulerProvider.INSTANCE, linearizerCmpFactory);
     }
 
 }
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesSecondaryIndexInsertOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesSecondaryIndexInsertOperatorTest.java
index 9fd8895..bbf4dd3 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesSecondaryIndexInsertOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesSecondaryIndexInsertOperatorTest.java
@@ -16,6 +16,7 @@
 package edu.uci.ics.hyracks.tests.am.lsm.rtree;
 
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksException;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexDataflowHelperFactory;
@@ -32,8 +33,8 @@
     @Override
     protected IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) {
         return ((LSMRTreeWithAntiMatterTuplesOperatorTestHelper) testHelper).createDataFlowHelperFactory(
-                secondaryValueProviderFactories, rtreePolicyType, btreeComparatorFactories);
+                secondaryValueProviderFactories, rtreePolicyType, btreeComparatorFactories, linearizerCmpFactory);
     }
 }
\ No newline at end of file
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesSecondaryIndexSearchOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesSecondaryIndexSearchOperatorTest.java
index 0ff6ff0..b615636 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesSecondaryIndexSearchOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesSecondaryIndexSearchOperatorTest.java
@@ -16,6 +16,7 @@
 package edu.uci.ics.hyracks.tests.am.lsm.rtree;
 
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.exceptions.HyracksException;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexDataflowHelperFactory;
@@ -32,8 +33,8 @@
     @Override
     protected IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) {
         return ((LSMRTreeWithAntiMatterTuplesOperatorTestHelper) testHelper).createDataFlowHelperFactory(
-                secondaryValueProviderFactories, rtreePolicyType, btreeComparatorFactories);
+                secondaryValueProviderFactories, rtreePolicyType, btreeComparatorFactories, linearizerCmpFactory);
     }
 }
\ No newline at end of file
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/AbstractRTreeOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/AbstractRTreeOperatorTest.java
index f522b25..638f347 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/AbstractRTreeOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/AbstractRTreeOperatorTest.java
@@ -23,6 +23,7 @@
 
 import edu.uci.ics.hyracks.api.constraints.PartitionConstraintHelper;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
@@ -53,12 +54,13 @@
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.api.TreeIndexException;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexDataflowHelperFactory;
+import edu.uci.ics.hyracks.storage.am.common.dataflow.IndexDropOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.TreeIndexBulkLoadOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.TreeIndexCreateOperatorDescriptor;
-import edu.uci.ics.hyracks.storage.am.common.dataflow.IndexDropOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.TreeIndexInsertUpdateDeleteOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.impls.NoOpOperationCallbackProvider;
 import edu.uci.ics.hyracks.storage.am.common.ophelpers.IndexOp;
+import edu.uci.ics.hyracks.storage.am.lsm.rtree.utils.LSMRTreeUtils;
 import edu.uci.ics.hyracks.storage.am.rtree.frames.RTreePolicyType;
 import edu.uci.ics.hyracks.storage.am.rtree.util.RTreeUtils;
 import edu.uci.ics.hyracks.storage.common.IStorageManagerInterface;
@@ -166,13 +168,15 @@
                 .createPrimitiveValueProviderFactories(secondaryComparatorFactories.length, DoublePointable.FACTORY);
 
         rtreeDataflowHelperFactory = createDataFlowHelperFactory(secondaryValueProviderFactories,
-                RTreePolicyType.RSTARTREE, btreeComparatorFactories);
+                RTreePolicyType.RSTARTREE, btreeComparatorFactories,
+                LSMRTreeUtils.proposeBestLinearizer(secondaryTypeTraits, secondaryComparatorFactories.length));
 
     }
 
     protected abstract IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) throws TreeIndexException;
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory)
+            throws TreeIndexException;
 
     protected void createPrimaryIndex() throws Exception {
         JobSpecification spec = new JobSpecification();
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexInsertOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexInsertOperatorTest.java
index 746194a..d01d701 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexInsertOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexInsertOperatorTest.java
@@ -23,6 +23,7 @@
 import edu.uci.ics.hyracks.api.constraints.PartitionConstraintHelper;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
@@ -117,7 +118,7 @@
     @Override
     protected IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) throws TreeIndexException {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) throws TreeIndexException {
         return ((RTreeOperatorTestHelper) testHelper).createDataFlowHelperFactory(secondaryValueProviderFactories,
                 rtreePolicyType, null);
     }
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexScanOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexScanOperatorTest.java
index 22d4952..c727700 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexScanOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexScanOperatorTest.java
@@ -23,6 +23,7 @@
 import edu.uci.ics.hyracks.api.constraints.PartitionConstraintHelper;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
@@ -101,7 +102,7 @@
     @Override
     protected IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) {
         return ((RTreeOperatorTestHelper) testHelper).createDataFlowHelperFactory(secondaryValueProviderFactories,
                 rtreePolicyType, null);
     }
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexSearchOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexSearchOperatorTest.java
index 6b8da2e..53ec214 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexSearchOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexSearchOperatorTest.java
@@ -23,6 +23,7 @@
 import edu.uci.ics.hyracks.api.constraints.PartitionConstraintHelper;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ISerializerDeserializer;
 import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
@@ -116,7 +117,7 @@
     @Override
     protected IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) throws TreeIndexException {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) throws TreeIndexException {
         return ((RTreeOperatorTestHelper) testHelper).createDataFlowHelperFactory(secondaryValueProviderFactories,
                 rtreePolicyType, null);
     }
diff --git a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexStatsOperatorTest.java b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexStatsOperatorTest.java
index eb2b681..59ecf06 100644
--- a/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexStatsOperatorTest.java
+++ b/hyracks-examples/hyracks-integration-tests/src/test/java/edu/uci/ics/hyracks/tests/am/rtree/RTreeSecondaryIndexStatsOperatorTest.java
@@ -21,6 +21,7 @@
 import edu.uci.ics.hyracks.api.constraints.PartitionConstraintHelper;
 import edu.uci.ics.hyracks.api.dataflow.IOperatorDescriptor;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.job.JobSpecification;
 import edu.uci.ics.hyracks.dataflow.std.connectors.OneToOneConnectorDescriptor;
 import edu.uci.ics.hyracks.dataflow.std.file.ConstantFileSplitProvider;
@@ -65,7 +66,7 @@
     @Override
     protected IIndexDataflowHelperFactory createDataFlowHelperFactory(
             IPrimitiveValueProviderFactory[] secondaryValueProviderFactories, RTreePolicyType rtreePolicyType,
-            IBinaryComparatorFactory[] btreeComparatorFactories) {
+            IBinaryComparatorFactory[] btreeComparatorFactories, ILinearizeComparatorFactory linearizerCmpFactory) {
         return ((RTreeOperatorTestHelper) testHelper).createDataFlowHelperFactory(secondaryValueProviderFactories,
                 rtreePolicyType, null);
     }
diff --git a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/AbstractLSMRTreeDataflowHelper.java b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/AbstractLSMRTreeDataflowHelper.java
index 54c8eac..c48b1ad 100644
--- a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/AbstractLSMRTreeDataflowHelper.java
+++ b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/AbstractLSMRTreeDataflowHelper.java
@@ -17,6 +17,7 @@
 
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.api.io.FileReference;
@@ -46,27 +47,30 @@
     protected final IBinaryComparatorFactory[] btreeComparatorFactories;
     protected final IPrimitiveValueProviderFactory[] valueProviderFactories;
     protected final RTreePolicyType rtreePolicyType;
+    protected final ILinearizeComparatorFactory linearizeCmpFactory;
 
     public AbstractLSMRTreeDataflowHelper(IIndexOperatorDescriptor opDesc, IHyracksTaskContext ctx, int partition,
             IBinaryComparatorFactory[] btreeComparatorFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILSMFlushController flushController, ILSMMergePolicy mergePolicy, ILSMOperationTracker opTracker,
-            ILSMIOOperationScheduler ioScheduler) {
+            ILSMIOOperationScheduler ioScheduler, ILinearizeComparatorFactory linearizeCmpFactory) {
         this(opDesc, ctx, partition, DEFAULT_MEM_PAGE_SIZE, DEFAULT_MEM_NUM_PAGES, btreeComparatorFactories,
-                valueProviderFactories, rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler);
+                valueProviderFactories, rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler,
+                linearizeCmpFactory);
     }
 
     public AbstractLSMRTreeDataflowHelper(IIndexOperatorDescriptor opDesc, IHyracksTaskContext ctx, int partition,
             int memPageSize, int memNumPages, IBinaryComparatorFactory[] btreeComparatorFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILSMFlushController flushController, ILSMMergePolicy mergePolicy, ILSMOperationTracker opTracker,
-            ILSMIOOperationScheduler ioScheduler) {
+            ILSMIOOperationScheduler ioScheduler, ILinearizeComparatorFactory linearizeCmpFactory) {
         super(opDesc, ctx, partition, memPageSize, memNumPages, flushController, mergePolicy, opTracker, ioScheduler);
         this.btreeComparatorFactories = btreeComparatorFactories;
         this.valueProviderFactories = valueProviderFactories;
         this.rtreePolicyType = rtreePolicyType;
+        this.linearizeCmpFactory = linearizeCmpFactory;
     }
-    
+
     @Override
     public ITreeIndex createIndexInstance() throws HyracksDataException {
         AbstractTreeIndexOperatorDescriptor treeOpDesc = (AbstractTreeIndexOperatorDescriptor) opDesc;
@@ -78,7 +82,7 @@
         return createLSMTree(memBufferCache, memFreePageManager, ctx.getIOManager(), file, opDesc.getStorageManager()
                 .getBufferCache(ctx), opDesc.getStorageManager().getFileMapProvider(ctx),
                 treeOpDesc.getTreeIndexTypeTraits(), treeOpDesc.getTreeIndexComparatorFactories(),
-                btreeComparatorFactories, valueProviderFactories, rtreePolicyType);
+                btreeComparatorFactories, valueProviderFactories, rtreePolicyType, linearizeCmpFactory);
 
     }
 
@@ -86,6 +90,6 @@
             InMemoryFreePageManager memFreePageManager, IIOManager ioManager, FileReference file,
             IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
             IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
-            IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType)
-            throws HyracksDataException;
+            IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
+            ILinearizeComparatorFactory linearizeCmpFactory) throws HyracksDataException;
 }
diff --git a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelper.java b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelper.java
index 8aab803..a57d411 100644
--- a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelper.java
+++ b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelper.java
@@ -17,6 +17,7 @@
 
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.api.io.FileReference;
@@ -41,30 +42,31 @@
             IBinaryComparatorFactory[] btreeComparatorFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILSMFlushController flushController, ILSMMergePolicy mergePolicy, ILSMOperationTracker opTracker,
-            ILSMIOOperationScheduler ioScheduler) {
+            ILSMIOOperationScheduler ioScheduler, ILinearizeComparatorFactory linearizeCmpFactory) {
         super(opDesc, ctx, partition, btreeComparatorFactories, valueProviderFactories, rtreePolicyType,
-                flushController, mergePolicy, opTracker, ioScheduler);
+                flushController, mergePolicy, opTracker, ioScheduler, linearizeCmpFactory);
     }
 
     public LSMRTreeDataflowHelper(IIndexOperatorDescriptor opDesc, IHyracksTaskContext ctx, int partition,
             int memPageSize, int memNumPages, IBinaryComparatorFactory[] btreeComparatorFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILSMFlushController flushController, ILSMMergePolicy mergePolicy, ILSMOperationTracker opTracker,
-            ILSMIOOperationScheduler ioScheduler) {
+            ILSMIOOperationScheduler ioScheduler, ILinearizeComparatorFactory linearizeCmpFactory) {
         super(opDesc, ctx, partition, memPageSize, memNumPages, btreeComparatorFactories, valueProviderFactories,
-                rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler);
+                rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler, linearizeCmpFactory);
     }
 
     @Override
     protected ITreeIndex createLSMTree(IBufferCache memBufferCache, InMemoryFreePageManager memFreePageManager,
-            IIOManager ioManager, FileReference file, IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider,
-            ITypeTraits[] typeTraits, IBinaryComparatorFactory[] rtreeCmpFactories,
-            IBinaryComparatorFactory[] btreeCmpFactories, IPrimitiveValueProviderFactory[] valueProviderFactories,
-            RTreePolicyType rtreePolicyType) throws HyracksDataException {
+            IIOManager ioManager, FileReference file, IBufferCache diskBufferCache,
+            IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
+            IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
+            IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
+            ILinearizeComparatorFactory linearizeCmpFactory) throws HyracksDataException {
         try {
-            return LSMRTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file,
-                    diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
-                    valueProviderFactories, rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler);
+            return LSMRTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file, diskBufferCache,
+                    diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories, valueProviderFactories,
+                    rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler, linearizeCmpFactory);
         } catch (TreeIndexException e) {
             throw new HyracksDataException(e);
         }
diff --git a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelperFactory.java b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelperFactory.java
index 3ab3b91..1778fe5 100644
--- a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelperFactory.java
+++ b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeDataflowHelperFactory.java
@@ -17,6 +17,7 @@
 
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IndexDataflowHelper;
@@ -34,22 +35,26 @@
     private final IBinaryComparatorFactory[] btreeComparatorFactories;
     private final IPrimitiveValueProviderFactory[] valueProviderFactories;
     private final RTreePolicyType rtreePolicyType;
+    private final ILinearizeComparatorFactory linearizeCmpFactory;
 
     public LSMRTreeDataflowHelperFactory(IPrimitiveValueProviderFactory[] valueProviderFactories,
             RTreePolicyType rtreePolicyType, IBinaryComparatorFactory[] btreeComparatorFactories,
             ILSMFlushControllerProvider flushControllerProvider, ILSMMergePolicyProvider mergePolicyProvider,
-            ILSMOperationTrackerProvider opTrackerProvider, ILSMIOOperationSchedulerProvider ioSchedulerProvider) {
+            ILSMOperationTrackerProvider opTrackerProvider, ILSMIOOperationSchedulerProvider ioSchedulerProvider,
+            ILinearizeComparatorFactory linearizeCmpFactory) {
         super(flushControllerProvider, mergePolicyProvider, opTrackerProvider, ioSchedulerProvider);
         this.btreeComparatorFactories = btreeComparatorFactories;
         this.valueProviderFactories = valueProviderFactories;
         this.rtreePolicyType = rtreePolicyType;
+        this.linearizeCmpFactory = linearizeCmpFactory;
     }
 
     @Override
     public IndexDataflowHelper createIndexDataflowHelper(IIndexOperatorDescriptor opDesc, IHyracksTaskContext ctx,
             int partition) {
         return new LSMRTreeDataflowHelper(opDesc, ctx, partition, btreeComparatorFactories, valueProviderFactories,
-                rtreePolicyType, flushControllerProvider.getFlushController(ctx), mergePolicyProvider.getMergePolicy(ctx),
-                opTrackerProvider.getOperationTracker(ctx), ioSchedulerProvider.getIOScheduler(ctx));
+                rtreePolicyType, flushControllerProvider.getFlushController(ctx),
+                mergePolicyProvider.getMergePolicy(ctx), opTrackerProvider.getOperationTracker(ctx),
+                ioSchedulerProvider.getIOScheduler(ctx), linearizeCmpFactory);
     }
 }
diff --git a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelper.java b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelper.java
index 33aa669..c554e53 100644
--- a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelper.java
+++ b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelper.java
@@ -17,6 +17,7 @@
 
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.api.dataflow.value.ITypeTraits;
 import edu.uci.ics.hyracks.api.exceptions.HyracksDataException;
 import edu.uci.ics.hyracks.api.io.FileReference;
@@ -40,30 +41,32 @@
             int partition, IBinaryComparatorFactory[] btreeComparatorFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILSMFlushController flushController, ILSMMergePolicy mergePolicy, ILSMOperationTracker opTracker,
-            ILSMIOOperationScheduler ioScheduler) {
+            ILSMIOOperationScheduler ioScheduler, ILinearizeComparatorFactory linearizeCmpFactory) {
         super(opDesc, ctx, partition, btreeComparatorFactories, valueProviderFactories, rtreePolicyType,
-                flushController, mergePolicy, opTracker, ioScheduler);
+                flushController, mergePolicy, opTracker, ioScheduler, linearizeCmpFactory);
     }
 
     public LSMRTreeWithAntiMatterTuplesDataflowHelper(IIndexOperatorDescriptor opDesc, IHyracksTaskContext ctx,
             int partition, int memPageSize, int memNumPages, IBinaryComparatorFactory[] btreeComparatorFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILSMFlushController flushController, ILSMMergePolicy mergePolicy, ILSMOperationTracker opTracker,
-            ILSMIOOperationScheduler ioScheduler) {
+            ILSMIOOperationScheduler ioScheduler, ILinearizeComparatorFactory linearizeCmpFactory) {
         super(opDesc, ctx, partition, memPageSize, memNumPages, btreeComparatorFactories, valueProviderFactories,
-                rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler);
+                rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler, linearizeCmpFactory);
     }
 
     @Override
     protected ITreeIndex createLSMTree(IBufferCache memBufferCache, InMemoryFreePageManager memFreePageManager,
-            IIOManager ioManager, FileReference file, IBufferCache diskBufferCache, IFileMapProvider diskFileMapProvider,
-            ITypeTraits[] typeTraits, IBinaryComparatorFactory[] rtreeCmpFactories,
-            IBinaryComparatorFactory[] btreeCmpFactories, IPrimitiveValueProviderFactory[] valueProviderFactories,
-            RTreePolicyType rtreePolicyType) throws HyracksDataException {
+            IIOManager ioManager, FileReference file, IBufferCache diskBufferCache,
+            IFileMapProvider diskFileMapProvider, ITypeTraits[] typeTraits,
+            IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
+            IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
+            ILinearizeComparatorFactory linearizeCmpFactory) throws HyracksDataException {
         try {
-            return LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(memBufferCache, memFreePageManager, ioManager,
-                    file, diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
-                    valueProviderFactories, rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler);
+            return LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(memBufferCache, memFreePageManager, ioManager, file,
+                    diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
+                    valueProviderFactories, rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler,
+                    linearizeCmpFactory);
         } catch (TreeIndexException e) {
             throw new HyracksDataException(e);
         }
diff --git a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelperFactory.java b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelperFactory.java
index 8dbc707..09c3ba2 100644
--- a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelperFactory.java
+++ b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/dataflow/LSMRTreeWithAntiMatterTuplesDataflowHelperFactory.java
@@ -17,6 +17,7 @@
 
 import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
 import edu.uci.ics.hyracks.api.dataflow.value.IBinaryComparatorFactory;
+import edu.uci.ics.hyracks.api.dataflow.value.ILinearizeComparatorFactory;
 import edu.uci.ics.hyracks.storage.am.common.api.IPrimitiveValueProviderFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexDataflowHelperFactory;
 import edu.uci.ics.hyracks.storage.am.common.dataflow.IIndexOperatorDescriptor;
@@ -38,11 +39,13 @@
     private final ILSMMergePolicyProvider mergePolicyProvider;
     private final ILSMOperationTrackerProvider opTrackerProvider;
     private final ILSMIOOperationSchedulerProvider ioSchedulerProvider;
+    private final ILinearizeComparatorFactory linearizeCmpFactory;
 
     public LSMRTreeWithAntiMatterTuplesDataflowHelperFactory(IPrimitiveValueProviderFactory[] valueProviderFactories,
             RTreePolicyType rtreePolicyType, IBinaryComparatorFactory[] btreeComparatorFactories,
             ILSMFlushControllerProvider flushControllerProvider, ILSMMergePolicyProvider mergePolicyProvider,
-            ILSMOperationTrackerProvider opTrackerProvider, ILSMIOOperationSchedulerProvider ioSchedulerProvider) {
+            ILSMOperationTrackerProvider opTrackerProvider, ILSMIOOperationSchedulerProvider ioSchedulerProvider,
+            ILinearizeComparatorFactory linearizeCmpFactory) {
         this.btreeComparatorFactories = btreeComparatorFactories;
         this.valueProviderFactories = valueProviderFactories;
         this.rtreePolicyType = rtreePolicyType;
@@ -50,6 +53,7 @@
         this.mergePolicyProvider = mergePolicyProvider;
         this.ioSchedulerProvider = ioSchedulerProvider;
         this.opTrackerProvider = opTrackerProvider;
+        this.linearizeCmpFactory = linearizeCmpFactory;
     }
 
     @Override
@@ -58,6 +62,6 @@
         return new LSMRTreeWithAntiMatterTuplesDataflowHelper(opDesc, ctx, partition, btreeComparatorFactories,
                 valueProviderFactories, rtreePolicyType, flushControllerProvider.getFlushController(ctx),
                 mergePolicyProvider.getMergePolicy(ctx), opTrackerProvider.getOperationTracker(ctx),
-                ioSchedulerProvider.getIOScheduler(ctx));
+                ioSchedulerProvider.getIOScheduler(ctx), linearizeCmpFactory);
     }
 }
diff --git a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/utils/LSMRTreeUtils.java b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/utils/LSMRTreeUtils.java
index 926c4ea..5d57195 100644
--- a/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/utils/LSMRTreeUtils.java
+++ b/hyracks-storage-am-lsm-rtree/src/main/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/utils/LSMRTreeUtils.java
@@ -31,9 +31,9 @@
 import edu.uci.ics.hyracks.storage.am.common.api.TreeIndexException;
 import edu.uci.ics.hyracks.storage.am.common.frames.LIFOMetaDataFrameFactory;
 import edu.uci.ics.hyracks.storage.am.common.freepage.LinkedListFreePageManagerFactory;
-import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexFileManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMFlushController;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIOOperationScheduler;
+import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMIndexFileManager;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMMergePolicy;
 import edu.uci.ics.hyracks.storage.am.lsm.common.api.ILSMOperationTracker;
 import edu.uci.ics.hyracks.storage.am.lsm.common.freepage.InMemoryFreePageManager;
@@ -64,7 +64,8 @@
             IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILSMFlushController flushController, ILSMMergePolicy mergePolicy, ILSMOperationTracker opTracker,
-            ILSMIOOperationScheduler ioScheduler) throws TreeIndexException {
+            ILSMIOOperationScheduler ioScheduler, ILinearizeComparatorFactory linearizeCmpFactory)
+            throws TreeIndexException {
         LSMTypeAwareTupleWriterFactory rtreeTupleWriterFactory = new LSMTypeAwareTupleWriterFactory(typeTraits, false);
         LSMTypeAwareTupleWriterFactory btreeTupleWriterFactory = new LSMTypeAwareTupleWriterFactory(typeTraits, true);
 
@@ -87,17 +88,16 @@
                 freePageManagerFactory, btreeInteriorFrameFactory, btreeLeafFrameFactory, btreeCmpFactories,
                 typeTraits.length);
 
-        ILinearizeComparatorFactory linearizer = proposeBestLinearizer(typeTraits, rtreeCmpFactories.length);
         int[] comparatorFields = { 0 };
-        IBinaryComparatorFactory[] linearizerArray = { linearizer };
+        IBinaryComparatorFactory[] linearizerArray = { linearizeCmpFactory };
 
         ILSMIndexFileManager fileNameManager = new LSMRTreeFileManager(ioManager, diskFileMapProvider, file,
                 diskRTreeFactory, diskBTreeFactory);
         LSMRTree lsmTree = new LSMRTree(memBufferCache, memFreePageManager, rtreeInteriorFrameFactory,
                 rtreeLeafFrameFactory, btreeInteriorFrameFactory, btreeLeafFrameFactory, fileNameManager,
                 diskRTreeFactory, diskBTreeFactory, diskFileMapProvider, typeTraits.length, rtreeCmpFactories,
-                btreeCmpFactories, linearizer, comparatorFields, linearizerArray, flushController, mergePolicy,
-                opTracker, ioScheduler);
+                btreeCmpFactories, linearizeCmpFactory, comparatorFields, linearizerArray, flushController,
+                mergePolicy, opTracker, ioScheduler);
         return lsmTree;
     }
 
@@ -107,7 +107,8 @@
             IBinaryComparatorFactory[] rtreeCmpFactories, IBinaryComparatorFactory[] btreeCmpFactories,
             IPrimitiveValueProviderFactory[] valueProviderFactories, RTreePolicyType rtreePolicyType,
             ILSMFlushController flushPolicy, ILSMMergePolicy mergePolicy, ILSMOperationTracker opTracker,
-            ILSMIOOperationScheduler ioScheduler) throws TreeIndexException {
+            ILSMIOOperationScheduler ioScheduler, ILinearizeComparatorFactory linearizerCmpFactory)
+            throws TreeIndexException {
 
         LSMRTreeTupleWriterFactory rtreeTupleWriterFactory = new LSMRTreeTupleWriterFactory(typeTraits, false);
         LSMRTreeTupleWriterFactory btreeTupleWriterFactory = new LSMRTreeTupleWriterFactory(typeTraits, true);
@@ -137,22 +138,23 @@
                 freePageManagerFactory, rtreeInteriorFrameFactory, rtreeLeafFrameFactory, rtreeCmpFactories,
                 typeTraits.length);
 
-        ILinearizeComparatorFactory linearizer = proposeBestLinearizer(typeTraits, rtreeCmpFactories.length);
         // The first field is for the sorted curve (e.g. Hilbert curve), and the
         // second field is for the primary key.
         int[] comparatorFields = { 0, btreeCmpFactories.length - 1 };
-        IBinaryComparatorFactory[] linearizerArray = { linearizer, btreeCmpFactories[btreeCmpFactories.length - 1] };
+        IBinaryComparatorFactory[] linearizerArray = { linearizerCmpFactory,
+                btreeCmpFactories[btreeCmpFactories.length - 1] };
 
-        ILSMIndexFileManager fileNameManager = new LSMIndexFileManager(ioManager, diskFileMapProvider, file, diskRTreeFactory);
+        ILSMIndexFileManager fileNameManager = new LSMIndexFileManager(ioManager, diskFileMapProvider, file,
+                diskRTreeFactory);
         LSMRTreeWithAntiMatterTuples lsmTree = new LSMRTreeWithAntiMatterTuples(memBufferCache, memFreePageManager,
                 rtreeInteriorFrameFactory, rtreeLeafFrameFactory, btreeInteriorFrameFactory, btreeLeafFrameFactory,
                 fileNameManager, diskRTreeFactory, bulkLoadRTreeFactory, diskFileMapProvider, typeTraits.length,
-                rtreeCmpFactories, btreeCmpFactories, linearizer, comparatorFields, linearizerArray, flushPolicy,
-                mergePolicy, opTracker, ioScheduler);
+                rtreeCmpFactories, btreeCmpFactories, linearizerCmpFactory, comparatorFields, linearizerArray,
+                flushPolicy, mergePolicy, opTracker, ioScheduler);
         return lsmTree;
     }
 
-    private static ILinearizeComparatorFactory proposeBestLinearizer(ITypeTraits[] typeTraits, int numKeyFields)
+    public static ILinearizeComparatorFactory proposeBestLinearizer(ITypeTraits[] typeTraits, int numKeyFields)
             throws TreeIndexException {
         for (int i = 0; i < numKeyFields; i++) {
             if (!(typeTraits[i].getClass().equals(typeTraits[0].getClass()))) {
diff --git a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeExamplesTest.java b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeExamplesTest.java
index c8bf1c8..7afeca1 100644
--- a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeExamplesTest.java
+++ b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeExamplesTest.java
@@ -41,7 +41,8 @@
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), typeTraits, rtreeCmpFactories, btreeCmpFactories,
                 valueProviderFactories, rtreePolicyType, harness.getFlushController(), harness.getMergePolicy(),
-                harness.getOperationTracker(), harness.getIOScheduler());
+                harness.getOperationTracker(), harness.getIOScheduler(),
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
     }
 
     @Before
diff --git a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesExamplesTest.java b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesExamplesTest.java
index bb2c5cf..7dc65b3 100644
--- a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesExamplesTest.java
+++ b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/LSMRTreeWithAntiMatterTuplesExamplesTest.java
@@ -41,7 +41,8 @@
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), typeTraits, rtreeCmpFactories,
                 btreeCmpFactories, valueProviderFactories, rtreePolicyType, harness.getFlushController(),
-                harness.getMergePolicy(), harness.getOperationTracker(), harness.getIOScheduler());
+                harness.getMergePolicy(), harness.getOperationTracker(), harness.getIOScheduler(),
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
     }
 
     @Before
diff --git a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeMultiThreadTest.java b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeMultiThreadTest.java
index 8b7ce02..324c557 100644
--- a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeMultiThreadTest.java
+++ b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeMultiThreadTest.java
@@ -61,7 +61,8 @@
                 harness.getIOManager(), harness.getFileReference(), harness.getDiskBufferCache(),
                 harness.getDiskFileMapProvider(), typeTraits, rtreeCmpFactories, btreeCmpFactories,
                 valueProviderFactories, rtreePolicyType, harness.getFlushController(), harness.getMergePolicy(),
-                harness.getOperationTracker(), harness.getIOScheduler());
+                harness.getOperationTracker(), harness.getIOScheduler(),
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
     }
 
     @Override
diff --git a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeWithAntiMatterTuplesMultiThreadTest.java b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeWithAntiMatterTuplesMultiThreadTest.java
index a5b864c..2add7b1 100644
--- a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeWithAntiMatterTuplesMultiThreadTest.java
+++ b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/multithread/LSMRTreeWithAntiMatterTuplesMultiThreadTest.java
@@ -61,7 +61,8 @@
                 harness.getMemFreePageManager(), harness.getIOManager(), harness.getFileReference(),
                 harness.getDiskBufferCache(), harness.getDiskFileMapProvider(), typeTraits, rtreeCmpFactories,
                 btreeCmpFactories, valueProviderFactories, rtreePolicyType, harness.getFlushController(),
-                harness.getMergePolicy(), harness.getOperationTracker(), harness.getIOScheduler());
+                harness.getMergePolicy(), harness.getOperationTracker(), harness.getIOScheduler(),
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
 
     }
 
diff --git a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestContext.java b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestContext.java
index eb660f1..a5368dc 100644
--- a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestContext.java
+++ b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeTestContext.java
@@ -80,7 +80,8 @@
                 fieldSerdes.length);
         LSMRTree lsmTree = LSMRTreeUtils.createLSMTree(memBufferCache, memFreePageManager, ioManager, file,
                 diskBufferCache, diskFileMapProvider, typeTraits, rtreeCmpFactories, btreeCmpFactories,
-                valueProviderFactories, rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler);
+                valueProviderFactories, rtreePolicyType, flushController, mergePolicy, opTracker, ioScheduler,
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
         LSMRTreeTestContext testCtx = new LSMRTreeTestContext(fieldSerdes, lsmTree);
         return testCtx;
     }
diff --git a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeWithAntiMatterTuplesTestContext.java b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeWithAntiMatterTuplesTestContext.java
index 7cd4d9d..dbef199 100644
--- a/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeWithAntiMatterTuplesTestContext.java
+++ b/hyracks-tests/hyracks-storage-am-lsm-rtree-test/src/test/java/edu/uci/ics/hyracks/storage/am/lsm/rtree/util/LSMRTreeWithAntiMatterTuplesTestContext.java
@@ -81,7 +81,8 @@
         LSMRTreeWithAntiMatterTuples lsmTree = LSMRTreeUtils.createLSMTreeWithAntiMatterTuples(memBufferCache,
                 memFreePageManager, ioManager, file, diskBufferCache, diskFileMapProvider, typeTraits,
                 rtreeCmpFactories, btreeCmpFactories, valueProviderFactories, rtreePolicyType, flushController,
-                mergePolicy, opTracker, ioScheduler);
+                mergePolicy, opTracker, ioScheduler,
+                LSMRTreeUtils.proposeBestLinearizer(typeTraits, rtreeCmpFactories.length));
         LSMRTreeWithAntiMatterTuplesTestContext testCtx = new LSMRTreeWithAntiMatterTuplesTestContext(fieldSerdes,
                 lsmTree);
         return testCtx;