diff --git a/tikv-client/src/main/java/com/pingcap/tikv/meta/TiDAGRequest.java b/tikv-client/src/main/java/com/pingcap/tikv/meta/TiDAGRequest.java
index bc49c96c57..15caea32ea 100644
--- a/tikv-client/src/main/java/com/pingcap/tikv/meta/TiDAGRequest.java
+++ b/tikv-client/src/main/java/com/pingcap/tikv/meta/TiDAGRequest.java
@@ -358,9 +358,7 @@ private DAGRequest.Builder buildScan(boolean buildIndexScan) {
           if (pos != null) {
             TiColumnInfo columnInfo = columnInfoList.get(indexColOffsets.get(pos));
             if (col.getColumnInfo().equals(columnInfo)) {
-              dagRequestBuilder.addOutputOffsets(pos);
               colOffsetInFieldMap.put(col, pos);
-              addRequiredIndexDataType(col.getType());
             }
             // TODO: primary key may also be considered if pkIsHandle
           }
diff --git a/tikv-client/src/main/java/com/pingcap/tikv/operation/iterator/CoprocessIterator.java b/tikv-client/src/main/java/com/pingcap/tikv/operation/iterator/CoprocessIterator.java
index a35922a7ea..f42b1ba337 100644
--- a/tikv-client/src/main/java/com/pingcap/tikv/operation/iterator/CoprocessIterator.java
+++ b/tikv-client/src/main/java/com/pingcap/tikv/operation/iterator/CoprocessIterator.java
@@ -30,7 +30,6 @@
 import com.pingcap.tikv.util.RangeSplitter.RegionTask;
 import java.util.Iterator;
 import java.util.List;
-import java.util.NoSuchElementException;
 
 public abstract class CoprocessIterator<T> implements Iterator<T> {
   protected final TiSession session;
@@ -80,11 +79,7 @@ public static CoprocessIterator<Row> getRowIterator(
         dagRequest.getPushDownType()) {
       @Override
       public Row next() {
-        if (hasNext()) {
-          return rowReader.readRow(schemaInfer.getTypes().toArray(new DataType[0]));
-        } else {
-          throw new NoSuchElementException();
-        }
+        return rowReader.readRow(schemaInfer.getTypes().toArray(new DataType[0]));
       }
     };
   }
@@ -109,11 +104,7 @@ public static CoprocessIterator<Long> getHandleIterator(
         req.getPushDownType()) {
       @Override
       public Long next() {
-        if (hasNext()) {
-          return rowReader.readRow(handleTypes).getLong(handleTypes.length - 1);
-        } else {
-          throw new NoSuchElementException();
-        }
+        return rowReader.readRow(handleTypes).getLong(handleTypes.length - 1);
       }
     };
   }
diff --git a/tikv-client/src/test/java/com/pingcap/tikv/operation/iterator/DAGIteratorTest.java b/tikv-client/src/test/java/com/pingcap/tikv/operation/iterator/DAGIteratorTest.java
index f68950d93b..c6f5dd0f97 100644
--- a/tikv-client/src/test/java/com/pingcap/tikv/operation/iterator/DAGIteratorTest.java
+++ b/tikv-client/src/test/java/com/pingcap/tikv/operation/iterator/DAGIteratorTest.java
@@ -81,10 +81,14 @@ public void staleEpochTest() {
     server.put("key1", cdo.toByteString());
     List<RegionTask> tasks = ImmutableList.of(RegionTask.newInstance(region, store, keyRanges));
     CoprocessIterator<Row> iter = CoprocessIterator.getRowIterator(req, tasks, session);
-    Row r = iter.next();
-    SchemaInfer infer = SchemaInfer.create(req);
-    assertEquals(r.get(0, infer.getType(0)), 666L);
-    assertEquals(r.get(1, infer.getType(1)), "value1");
+    if (!iter.hasNext()) {
+      assertEquals("iterator has next should be true", true, false);
+    } else {
+      Row r = iter.next();
+      SchemaInfer infer = SchemaInfer.create(req);
+      assertEquals(r.get(0, infer.getType(0)), 666L);
+      assertEquals(r.get(1, infer.getType(1)), "value1");
+    }
   }
 
   private static KeyRange createByteStringRange(ByteString sKey, ByteString eKey) {