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haonan pushed a commit to branch VectorCodeSmell
in repository https://gitbox.apache.org/repos/asf/iotdb.git

commit 0cab4c4f0f6fb9637dd4ea200b9d33cef668023b
Author: HTHou <[email protected]>
AuthorDate: Mon Apr 12 11:53:19 2021 +0800

    [To Vector] Fix Vector Code Smell Step 1
---
 .../main/java/org/apache/iotdb/SessionExample.java |  1 +
 .../org/apache/iotdb/VectorSessionExample.java     |  5 +-
 .../iotdb/db/engine/flush/MemTableFlushTask.java   | 22 +++----
 .../iotdb/db/engine/memtable/AbstractMemTable.java | 10 ++--
 .../db/engine/memtable/IWritableMemChunk.java      |  6 +-
 .../iotdb/db/engine/memtable/WritableMemChunk.java | 21 +++----
 .../db/engine/querycontext/ReadOnlyMemChunk.java   | 12 +++-
 .../db/engine/storagegroup/TsFileProcessor.java    |  9 +--
 .../db/engine/storagegroup/TsFileResource.java     |  2 +
 .../iotdb/db/metadata/VectorPartialPath.java       |  1 +
 .../apache/iotdb/db/qp/executor/PlanExecutor.java  |  6 +-
 .../iotdb/db/qp/physical/crud/InsertRowPlan.java   |  8 +--
 .../db/qp/physical/crud/SetDeviceTemplatePlan.java |  1 +
 .../physical/sys/CreateAlignedTimeSeriesPlan.java  |  1 +
 .../physical/sys/SetUsingDeviceTemplatePlan.java   |  2 +-
 .../query/reader/series/SeriesReaderFactory.java   |  1 +
 .../db/query/reader/series/VectorSeriesReader.java |  1 +
 .../iotdb/db/rescon/PrimitiveArrayManager.java     |  3 +-
 .../apache/iotdb/db/rescon/TVListAllocator.java    |  2 +
 .../db/tools/upgrade/TsFileOnlineUpgradeTool.java  |  3 +-
 .../java/org/apache/iotdb/db/utils/MemUtils.java   |  9 +++
 .../org/apache/iotdb/db/utils/SchemaUtils.java     |  1 -
 .../org/apache/iotdb/db/utils/SerializeUtils.java  |  2 +
 .../iotdb/db/utils/datastructure/TVList.java       | 10 +++-
 .../iotdb/db/utils/datastructure/VectorTVList.java | 68 ++++++++++++++++++----
 .../iotdb/db/writelog/recover/LogReplayer.java     |  6 +-
 .../db/engine/memtable/PrimitiveMemTableTest.java  |  2 +-
 .../iotdb/db/metadata/MManagerBasicTest.java       |  1 +
 .../java/org/apache/iotdb/tsfile/utils/Binary.java |  2 +-
 .../java/org/apache/iotdb/tsfile/utils/BitMap.java |  3 +-
 30 files changed, 158 insertions(+), 63 deletions(-)

diff --git a/example/session/src/main/java/org/apache/iotdb/SessionExample.java 
b/example/session/src/main/java/org/apache/iotdb/SessionExample.java
index 612544a..d996d10 100644
--- a/example/session/src/main/java/org/apache/iotdb/SessionExample.java
+++ b/example/session/src/main/java/org/apache/iotdb/SessionExample.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb;
 
 import org.apache.iotdb.rpc.IoTDBConnectionException;
diff --git 
a/example/session/src/main/java/org/apache/iotdb/VectorSessionExample.java 
b/example/session/src/main/java/org/apache/iotdb/VectorSessionExample.java
index 75b4bbb..2d09761 100644
--- a/example/session/src/main/java/org/apache/iotdb/VectorSessionExample.java
+++ b/example/session/src/main/java/org/apache/iotdb/VectorSessionExample.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb;
 
 import org.apache.iotdb.rpc.IoTDBConnectionException;
@@ -34,6 +35,7 @@ import java.util.ArrayList;
 import java.util.List;
 import java.util.Random;
 
+@SuppressWarnings("squid:S106")
 public class VectorSessionExample {
 
   private static Session session;
@@ -146,7 +148,8 @@ public class VectorSessionExample {
     dataSet.closeOperationHandle();
     dataSet =
         session.executeQueryStatement(
-            "select count(*) from root.sg_1.d1 where time > 50 and s1 > 0 and 
s2 > 10000  GROUP BY ([50, 100), 10ms)");
+            "select count(*) from root.sg_1.d1 where time > 50 and s1 > 0 and 
s2 > 10000"
+                + " GROUP BY ([50, 100), 10ms)");
     System.out.println(dataSet.getColumnNames());
     while (dataSet.hasNext()) {
       System.out.println(dataSet.next());
diff --git 
a/server/src/main/java/org/apache/iotdb/db/engine/flush/MemTableFlushTask.java 
b/server/src/main/java/org/apache/iotdb/db/engine/flush/MemTableFlushTask.java
index 8206f7f..633dd6e 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/engine/flush/MemTableFlushTask.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/engine/flush/MemTableFlushTask.java
@@ -114,7 +114,7 @@ public class MemTableFlushTask {
         long startTime = System.currentTimeMillis();
         IWritableMemChunk series = iWritableMemChunkEntry.getValue();
         IMeasurementSchema desc = series.getSchema();
-        TVList tvList = series.getSortedTVListForFlush();
+        TVList tvList = series.getSortedTvListForFlush();
         sortTime += System.currentTimeMillis() - startTime;
         encodingTaskQueue.put(new Pair<>(tvList, desc));
       }
@@ -195,46 +195,46 @@ public class MemTableFlushTask {
                 seriesWriterImpl.write(time, 
tvPairs.getBinary(sortedRowIndex), false);
                 break;
               case VECTOR:
-                VectorTVList vectorTVPairs = (VectorTVList) tvPairs;
-                List<TSDataType> dataTypes = vectorTVPairs.getTsDataTypes();
-                int originRowIndex = 
vectorTVPairs.getValueIndex(sortedRowIndex);
+                VectorTVList vectorTvPairs = (VectorTVList) tvPairs;
+                List<TSDataType> dataTypes = vectorTvPairs.getTsDataTypes();
+                int originRowIndex = 
vectorTvPairs.getValueIndex(sortedRowIndex);
                 for (int columnIndex = 0; columnIndex < dataTypes.size(); 
columnIndex++) {
-                  boolean isNull = vectorTVPairs.isValueMarked(originRowIndex, 
columnIndex);
+                  boolean isNull = vectorTvPairs.isValueMarked(originRowIndex, 
columnIndex);
                   switch (dataTypes.get(columnIndex)) {
                     case BOOLEAN:
                       seriesWriterImpl.write(
                           time,
-                          vectorTVPairs.getBooleanByValueIndex(originRowIndex, 
columnIndex),
+                          vectorTvPairs.getBooleanByValueIndex(originRowIndex, 
columnIndex),
                           isNull);
                       break;
                     case INT32:
                       seriesWriterImpl.write(
                           time,
-                          vectorTVPairs.getIntByValueIndex(originRowIndex, 
columnIndex),
+                          vectorTvPairs.getIntByValueIndex(originRowIndex, 
columnIndex),
                           isNull);
                       break;
                     case INT64:
                       seriesWriterImpl.write(
                           time,
-                          vectorTVPairs.getLongByValueIndex(originRowIndex, 
columnIndex),
+                          vectorTvPairs.getLongByValueIndex(originRowIndex, 
columnIndex),
                           isNull);
                       break;
                     case FLOAT:
                       seriesWriterImpl.write(
                           time,
-                          vectorTVPairs.getFloatByValueIndex(originRowIndex, 
columnIndex),
+                          vectorTvPairs.getFloatByValueIndex(originRowIndex, 
columnIndex),
                           isNull);
                       break;
                     case DOUBLE:
                       seriesWriterImpl.write(
                           time,
-                          vectorTVPairs.getDoubleByValueIndex(originRowIndex, 
columnIndex),
+                          vectorTvPairs.getDoubleByValueIndex(originRowIndex, 
columnIndex),
                           isNull);
                       break;
                     case TEXT:
                       seriesWriterImpl.write(
                           time,
-                          vectorTVPairs.getBinaryByValueIndex(originRowIndex, 
columnIndex),
+                          vectorTvPairs.getBinaryByValueIndex(originRowIndex, 
columnIndex),
                           isNull);
                       break;
                     default:
diff --git 
a/server/src/main/java/org/apache/iotdb/db/engine/memtable/AbstractMemTable.java
 
b/server/src/main/java/org/apache/iotdb/db/engine/memtable/AbstractMemTable.java
index e665822..0eb04c8 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/engine/memtable/AbstractMemTable.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/engine/memtable/AbstractMemTable.java
@@ -181,6 +181,7 @@ public abstract class AbstractMemTable implements IMemTable 
{
     memSeries.write(insertTime, objectValue);
   }
 
+  @SuppressWarnings("squid:S3776") // high Cognitive Complexity
   @Override
   public void write(InsertTabletPlan insertTabletPlan, int start, int end) {
     int columnIndex = 0;
@@ -312,9 +313,9 @@ public abstract class AbstractMemTable implements IMemTable 
{
         
columns.add(vectorSchema.getValueMeasurementIdList().indexOf(queryingMeasurement));
       }
       // get sorted tv list is synchronized so different query can get right 
sorted list reference
-      TVList vectorTVListCopy = 
vectorMemChunk.getSortedTVListForQuery(columns);
-      int curSize = vectorTVListCopy.size();
-      return new ReadOnlyMemChunk(partialVectorSchema, vectorTVListCopy, 
curSize, deletionList);
+      TVList vectorTvListCopy = 
vectorMemChunk.getSortedTvListForQuery(columns);
+      int curSize = vectorTvListCopy.size();
+      return new ReadOnlyMemChunk(partialVectorSchema, vectorTvListCopy, 
curSize, deletionList);
     } else {
       if (!checkPath(deviceId, measurement)) {
         return null;
@@ -322,7 +323,7 @@ public abstract class AbstractMemTable implements IMemTable 
{
       IWritableMemChunk memChunk =
           
memTableMap.get(deviceId).get(partialVectorSchema.getMeasurementId());
       // get sorted tv list is synchronized so different query can get right 
sorted list reference
-      TVList chunkCopy = memChunk.getSortedTVListForQuery();
+      TVList chunkCopy = memChunk.getSortedTvListForQuery();
       int curSize = chunkCopy.size();
       return new ReadOnlyMemChunk(
           measurement,
@@ -335,6 +336,7 @@ public abstract class AbstractMemTable implements IMemTable 
{
     }
   }
 
+  @SuppressWarnings("squid:S3776") // high Cognitive Complexity
   @Override
   public void delete(
       PartialPath originalPath, PartialPath devicePath, long startTimestamp, 
long endTimestamp) {
diff --git 
a/server/src/main/java/org/apache/iotdb/db/engine/memtable/IWritableMemChunk.java
 
b/server/src/main/java/org/apache/iotdb/db/engine/memtable/IWritableMemChunk.java
index 283a0da..6cb896f 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/engine/memtable/IWritableMemChunk.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/engine/memtable/IWritableMemChunk.java
@@ -80,7 +80,7 @@ public interface IWritableMemChunk {
    *
    * @return sorted tv list
    */
-  TVList getSortedTVListForQuery();
+  TVList getSortedTvListForQuery();
 
   /**
    * served for vector query requests.
@@ -90,7 +90,7 @@ public interface IWritableMemChunk {
    * @param columnIndexList indices of queried columns in the full VectorTVList
    * @return sorted tv list
    */
-  TVList getSortedTVListForQuery(List<Integer> columnIndexList);
+  TVList getSortedTvListForQuery(List<Integer> columnIndexList);
 
   /**
    * served for flush requests. The logic is just same as 
getSortedTVListForQuery, but without add
@@ -98,7 +98,7 @@ public interface IWritableMemChunk {
    *
    * @return sorted tv list
    */
-  TVList getSortedTVListForFlush();
+  TVList getSortedTvListForFlush();
 
   default TVList getTVList() {
     return null;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/engine/memtable/WritableMemChunk.java
 
b/server/src/main/java/org/apache/iotdb/db/engine/memtable/WritableMemChunk.java
index 7d1a185..3679cc3 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/engine/memtable/WritableMemChunk.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/engine/memtable/WritableMemChunk.java
@@ -31,6 +31,7 @@ public class WritableMemChunk implements IWritableMemChunk {
 
   private IMeasurementSchema schema;
   private TVList list;
+  private static final String UNSUPPORTED_TYPE = "Unsupported data type:";
 
   public WritableMemChunk(IMeasurementSchema schema, TVList list) {
     this.schema = schema;
@@ -62,7 +63,7 @@ public class WritableMemChunk implements IWritableMemChunk {
         putVector(insertTime, (Object[]) objectValue);
         break;
       default:
-        throw new UnSupportedDataTypeException("Unsupported data type:" + 
schema.getType());
+        throw new UnSupportedDataTypeException(UNSUPPORTED_TYPE + 
schema.getType());
     }
   }
 
@@ -99,7 +100,7 @@ public class WritableMemChunk implements IWritableMemChunk {
         putVectors(times, (BitMap[]) bitMap, vectorValues, start, end);
         break;
       default:
-        throw new UnSupportedDataTypeException("Unsupported data type:" + 
dataType);
+        throw new UnSupportedDataTypeException(UNSUPPORTED_TYPE + dataType);
     }
   }
 
@@ -174,7 +175,7 @@ public class WritableMemChunk implements IWritableMemChunk {
   }
 
   @Override
-  public synchronized TVList getSortedTVListForQuery() {
+  public synchronized TVList getSortedTvListForQuery() {
     sortTVList();
     // increase reference count
     list.increaseReferenceCount();
@@ -182,14 +183,14 @@ public class WritableMemChunk implements 
IWritableMemChunk {
   }
 
   @Override
-  public synchronized TVList getSortedTVListForQuery(List<Integer> 
columnIndexList) {
+  public synchronized TVList getSortedTvListForQuery(List<Integer> 
columnIndexList) {
     if (list.getDataType() != TSDataType.VECTOR) {
-      throw new UnSupportedDataTypeException("Unsupported data type:" + 
list.getDataType());
+      throw new UnSupportedDataTypeException(UNSUPPORTED_TYPE + 
list.getDataType());
     }
     sortTVList();
     // increase reference count
     list.increaseReferenceCount();
-    return list.getTVListByColumnIndex(columnIndexList);
+    return list.getTvListByColumnIndex(columnIndexList);
   }
 
   private void sortTVList() {
@@ -204,7 +205,7 @@ public class WritableMemChunk implements IWritableMemChunk {
   }
 
   @Override
-  public synchronized TVList getSortedTVListForFlush() {
+  public synchronized TVList getSortedTvListForFlush() {
     sortTVList();
     return list;
   }
@@ -242,15 +243,15 @@ public class WritableMemChunk implements 
IWritableMemChunk {
 
   @Override
   public String toString() {
-    int size = getSortedTVListForQuery().size();
+    int size = getSortedTvListForQuery().size();
     StringBuilder out = new StringBuilder("MemChunk Size: " + size + 
System.lineSeparator());
     if (size != 0) {
       out.append("Data 
type:").append(schema.getType()).append(System.lineSeparator());
       out.append("First point:")
-          .append(getSortedTVListForQuery().getTimeValuePair(0))
+          .append(getSortedTvListForQuery().getTimeValuePair(0))
           .append(System.lineSeparator());
       out.append("Last point:")
-          .append(getSortedTVListForQuery().getTimeValuePair(size - 1))
+          .append(getSortedTvListForQuery().getTimeValuePair(size - 1))
           .append(System.lineSeparator());
     }
     return out.toString();
diff --git 
a/server/src/main/java/org/apache/iotdb/db/engine/querycontext/ReadOnlyMemChunk.java
 
b/server/src/main/java/org/apache/iotdb/db/engine/querycontext/ReadOnlyMemChunk.java
index 7337bdb..dced8ed 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/engine/querycontext/ReadOnlyMemChunk.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/engine/querycontext/ReadOnlyMemChunk.java
@@ -139,7 +139,16 @@ public class ReadOnlyMemChunk {
     cachedMetaData = metaData;
   }
 
-  // For vector type
+  /**
+   * The constructor for VECTOR type
+   *
+   * @param schema VectorMeasurementSchema
+   * @param tvList VectorTvList
+   * @param size The Number of Chunk data points
+   * @param deletionList The timeRange of deletionList
+   * @throws IOException
+   * @throws QueryProcessException
+   */
   public ReadOnlyMemChunk(
       IMeasurementSchema schema, TVList tvList, int size, List<TimeRange> 
deletionList)
       throws IOException, QueryProcessException {
@@ -155,6 +164,7 @@ public class ReadOnlyMemChunk {
     initVectorChunkMeta(schema);
   }
 
+  @SuppressWarnings("squid:S3776") // high Cognitive Complexity
   private void initVectorChunkMeta(IMeasurementSchema schema)
       throws IOException, QueryProcessException {
     Statistics timeStatistics = Statistics.getStatsByType(TSDataType.VECTOR);
diff --git 
a/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileProcessor.java
 
b/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileProcessor.java
index 352919e..0207971 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileProcessor.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileProcessor.java
@@ -277,6 +277,7 @@ public class TsFileProcessor {
     tsFileResource.updatePlanIndexes(insertTabletPlan.getIndex());
   }
 
+  @SuppressWarnings("squid:S3776") // high Cognitive Complexity
   private void checkMemCostAndAddToTspInfo(InsertRowPlan insertRowPlan)
       throws WriteProcessException {
     // memory of increased PrimitiveArray and TEXT values, e.g., add a 
long[128], add 128*8
@@ -302,7 +303,7 @@ public class TsFileProcessor {
                   * ChunkMetadata.calculateRamSize(
                       schema.getValueMeasurementIdList().get(0),
                       schema.getValueTSDataTypeList().get(0));
-          memTableIncrement += 
TVList.vectorTVListArrayMemSize(schema.getValueTSDataTypeList());
+          memTableIncrement += 
TVList.vectorTvListArrayMemSize(schema.getValueTSDataTypeList());
         } else {
           chunkMetadataIncrement +=
               ChunkMetadata.calculateRamSize(
@@ -425,20 +426,20 @@ public class TsFileProcessor {
               * ChunkMetadata.calculateRamSize(measurementIds.get(0), 
dataTypes.get(0));
       memIncrements[0] +=
           ((end - start) / PrimitiveArrayManager.ARRAY_SIZE + 1)
-              * TVList.vectorTVListArrayMemSize(dataTypes);
+              * TVList.vectorTvListArrayMemSize(dataTypes);
     } else {
       int currentChunkPointNum =
           workMemTable.getCurrentChunkPointNum(deviceId, 
vectorSchema.getMeasurementId());
       if (currentChunkPointNum % PrimitiveArrayManager.ARRAY_SIZE == 0) {
         memIncrements[0] +=
             ((end - start) / PrimitiveArrayManager.ARRAY_SIZE + 1)
-                * TVList.vectorTVListArrayMemSize(dataTypes);
+                * TVList.vectorTvListArrayMemSize(dataTypes);
       } else {
         int acquireArray =
             (end - start - 1 + (currentChunkPointNum % 
PrimitiveArrayManager.ARRAY_SIZE))
                 / PrimitiveArrayManager.ARRAY_SIZE;
         memIncrements[0] +=
-            acquireArray == 0 ? 0 : acquireArray * 
TVList.vectorTVListArrayMemSize(dataTypes);
+            acquireArray == 0 ? 0 : acquireArray * 
TVList.vectorTvListArrayMemSize(dataTypes);
       }
     }
     // TEXT data size
diff --git 
a/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileResource.java
 
b/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileResource.java
index 22f751f..2390a7c 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileResource.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileResource.java
@@ -216,6 +216,7 @@ public class TsFileResource {
     this.timeIndexType = 1;
   }
 
+  @SuppressWarnings("squid:S3776") // high Cognitive Complexity
   private void generateTimeSeriesMetadata() throws IOException {
     TimeseriesMetadata timeTimeSeriesMetadata = new TimeseriesMetadata();
     timeTimeSeriesMetadata.setOffsetOfChunkMetaDataList(-1);
@@ -661,6 +662,7 @@ public class TsFileResource {
     this.processor = processor;
   }
 
+  /** @return TimeseriesMetadata or VectorTimeseriesMetadata */
   public TimeseriesMetadata getTimeSeriesMetadata() {
     if (timeSeriesMetadata == null) {
       return null;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/metadata/VectorPartialPath.java 
b/server/src/main/java/org/apache/iotdb/db/metadata/VectorPartialPath.java
index f1aa76a..b4cdcc4 100644
--- a/server/src/main/java/org/apache/iotdb/db/metadata/VectorPartialPath.java
+++ b/server/src/main/java/org/apache/iotdb/db/metadata/VectorPartialPath.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb.db.metadata;
 
 import org.apache.iotdb.db.exception.metadata.IllegalPathException;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/qp/executor/PlanExecutor.java 
b/server/src/main/java/org/apache/iotdb/db/qp/executor/PlanExecutor.java
index 791f9b6..3cc4bc5 100644
--- a/server/src/main/java/org/apache/iotdb/db/qp/executor/PlanExecutor.java
+++ b/server/src/main/java/org/apache/iotdb/db/qp/executor/PlanExecutor.java
@@ -130,6 +130,7 @@ import org.apache.iotdb.rpc.RpcUtils;
 import org.apache.iotdb.rpc.TSStatusCode;
 import org.apache.iotdb.tsfile.common.constant.TsFileConstant;
 import 
org.apache.iotdb.tsfile.exception.filter.QueryFilterOptimizationException;
+import org.apache.iotdb.tsfile.exception.write.UnSupportedDataTypeException;
 import org.apache.iotdb.tsfile.file.metadata.ChunkGroupMetadata;
 import org.apache.iotdb.tsfile.file.metadata.ChunkMetadata;
 import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
@@ -652,6 +653,8 @@ public class PlanExecutor implements IPlanExecutor {
       case BOOLEAN:
         field.setBoolV(((boolean) val));
         break;
+      default:
+        throw new UnSupportedDataTypeException("Unsupported data type" + 
columnType);
     }
     RowRecord record = new RowRecord(0);
     record.addField(field);
@@ -1420,6 +1423,7 @@ public class PlanExecutor implements IPlanExecutor {
     return true;
   }
 
+  @SuppressWarnings("squid:S3776") // high Cognitive Complexity
   private boolean createMultiTimeSeries(CreateMultiTimeSeriesPlan multiPlan)
       throws BatchProcessException {
     int dataTypeIdx = 0;
@@ -1851,7 +1855,7 @@ public class PlanExecutor implements IPlanExecutor {
 
   /**
    * @param storageGroups the storage groups to check
-   * @return List<PartialPath> the storage groups that not exist
+   * @return List of PartialPath the storage groups that not exist
    */
   List<PartialPath> checkStorageGroupExist(List<PartialPath> storageGroups) {
     List<PartialPath> noExistSg = new ArrayList<>();
diff --git 
a/server/src/main/java/org/apache/iotdb/db/qp/physical/crud/InsertRowPlan.java 
b/server/src/main/java/org/apache/iotdb/db/qp/physical/crud/InsertRowPlan.java
index 9c19d9a..bd0150d 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/qp/physical/crud/InsertRowPlan.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/qp/physical/crud/InsertRowPlan.java
@@ -438,12 +438,8 @@ public class InsertRowPlan extends InsertPlan {
       // types are not determined, the situation mainly occurs when the plan 
uses string values
       // and is forwarded to other nodes
       byte typeNum = (byte) ReadWriteIOUtils.read(buffer);
-      if (typeNum == TYPE_RAW_STRING) {
-        values[i] = ReadWriteIOUtils.readString(buffer);
-        continue;
-      }
-      if (typeNum == TYPE_NULL) {
-        values[i] = null;
+      if (typeNum == TYPE_RAW_STRING || typeNum == TYPE_NULL) {
+        values[i] = typeNum == TYPE_RAW_STRING ? 
ReadWriteIOUtils.readString(buffer) : null;
         continue;
       }
       dataTypes[i] = TSDataType.values()[typeNum];
diff --git 
a/server/src/main/java/org/apache/iotdb/db/qp/physical/crud/SetDeviceTemplatePlan.java
 
b/server/src/main/java/org/apache/iotdb/db/qp/physical/crud/SetDeviceTemplatePlan.java
index e3634b6..b76703a 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/qp/physical/crud/SetDeviceTemplatePlan.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/qp/physical/crud/SetDeviceTemplatePlan.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb.db.qp.physical.crud;
 
 import org.apache.iotdb.db.metadata.PartialPath;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/qp/physical/sys/CreateAlignedTimeSeriesPlan.java
 
b/server/src/main/java/org/apache/iotdb/db/qp/physical/sys/CreateAlignedTimeSeriesPlan.java
index ed4ab6c..5451860 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/qp/physical/sys/CreateAlignedTimeSeriesPlan.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/qp/physical/sys/CreateAlignedTimeSeriesPlan.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb.db.qp.physical.sys;
 
 import org.apache.iotdb.db.exception.metadata.IllegalPathException;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/qp/physical/sys/SetUsingDeviceTemplatePlan.java
 
b/server/src/main/java/org/apache/iotdb/db/qp/physical/sys/SetUsingDeviceTemplatePlan.java
index b8ccdf2..6d20145 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/qp/physical/sys/SetUsingDeviceTemplatePlan.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/qp/physical/sys/SetUsingDeviceTemplatePlan.java
@@ -35,7 +35,7 @@ import java.util.List;
 
 public class SetUsingDeviceTemplatePlan extends PhysicalPlan {
 
-  private static final Logger logger = 
LoggerFactory.getLogger(AutoCreateDeviceMNodePlan.class);
+  private static final Logger logger = 
LoggerFactory.getLogger(SetUsingDeviceTemplatePlan.class);
   PartialPath prefixPath;
 
   public SetUsingDeviceTemplatePlan() {
diff --git 
a/server/src/main/java/org/apache/iotdb/db/query/reader/series/SeriesReaderFactory.java
 
b/server/src/main/java/org/apache/iotdb/db/query/reader/series/SeriesReaderFactory.java
index f0a1a47..c27ce49 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/query/reader/series/SeriesReaderFactory.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/query/reader/series/SeriesReaderFactory.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb.db.query.reader.series;
 
 import org.apache.iotdb.db.engine.querycontext.QueryDataSource;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/query/reader/series/VectorSeriesReader.java
 
b/server/src/main/java/org/apache/iotdb/db/query/reader/series/VectorSeriesReader.java
index ecd03c6..ec362a8 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/query/reader/series/VectorSeriesReader.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/query/reader/series/VectorSeriesReader.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb.db.query.reader.series;
 
 import org.apache.iotdb.db.engine.querycontext.QueryDataSource;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/rescon/PrimitiveArrayManager.java 
b/server/src/main/java/org/apache/iotdb/db/rescon/PrimitiveArrayManager.java
index 53381ea..5924bd7 100644
--- a/server/src/main/java/org/apache/iotdb/db/rescon/PrimitiveArrayManager.java
+++ b/server/src/main/java/org/apache/iotdb/db/rescon/PrimitiveArrayManager.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb.db.rescon;
 
 import org.apache.iotdb.db.conf.IoTDBConfig;
@@ -36,7 +37,7 @@ import java.util.concurrent.atomic.AtomicLong;
 /** Manage all primitive data list in memory, including get and release 
operation. */
 public class PrimitiveArrayManager {
 
-  /** data type -> ArrayDeque<Array> */
+  /** data type -> ArrayDeque\<Array\> */
   private static final Map<TSDataType, ArrayDeque<Object>> bufferedArraysMap =
       new EnumMap<>(TSDataType.class);
 
diff --git 
a/server/src/main/java/org/apache/iotdb/db/rescon/TVListAllocator.java 
b/server/src/main/java/org/apache/iotdb/db/rescon/TVListAllocator.java
index 0f683a8..d18b98d 100644
--- a/server/src/main/java/org/apache/iotdb/db/rescon/TVListAllocator.java
+++ b/server/src/main/java/org/apache/iotdb/db/rescon/TVListAllocator.java
@@ -56,6 +56,7 @@ public class TVListAllocator implements TVListAllocatorMBean, 
IService {
     return TVList.newVectorList(dataTypes);
   }
 
+  /** For non-vector types */
   public synchronized void release(TSDataType dataType, TVList list) {
     list.clear();
     if (dataType != TSDataType.VECTOR) {
@@ -63,6 +64,7 @@ public class TVListAllocator implements TVListAllocatorMBean, 
IService {
     }
   }
 
+  /** For VECTOR type only */
   public synchronized void release(TVList list) {
     list.clear();
     if (list.getDataType() != TSDataType.VECTOR) {
diff --git 
a/server/src/main/java/org/apache/iotdb/db/tools/upgrade/TsFileOnlineUpgradeTool.java
 
b/server/src/main/java/org/apache/iotdb/db/tools/upgrade/TsFileOnlineUpgradeTool.java
index a6dfd19..afe6bfc 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/tools/upgrade/TsFileOnlineUpgradeTool.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/tools/upgrade/TsFileOnlineUpgradeTool.java
@@ -83,7 +83,8 @@ public class TsFileOnlineUpgradeTool extends 
TsFileRewriteTool {
   /**
    * upgrade file resource
    *
-   * @throws IOException, WriteProcessException
+   * @throws IOException
+   * @throws WriteProcessException
    */
   @SuppressWarnings({"squid:S3776", "deprecation"}) // Suppress high Cognitive 
Complexity warning
   private void upgradeFile(List<TsFileResource> upgradedResources)
diff --git a/server/src/main/java/org/apache/iotdb/db/utils/MemUtils.java 
b/server/src/main/java/org/apache/iotdb/db/utils/MemUtils.java
index 8ad1373..667a984 100644
--- a/server/src/main/java/org/apache/iotdb/db/utils/MemUtils.java
+++ b/server/src/main/java/org/apache/iotdb/db/utils/MemUtils.java
@@ -56,6 +56,10 @@ public class MemUtils {
     return 8L + dataType.getDataTypeSize();
   }
 
+  /**
+   * function for getting the vector value size. If mem control enabled, do 
not add text data size
+   * here, the size will be added to memtable before inserting.
+   */
   public static long getVectorRecordSize(
       List<TSDataType> dataTypes, Object[] value, boolean addingTextDataSize) {
     // time and index size
@@ -87,6 +91,7 @@ public class MemUtils {
    * If mem control enabled, do not add text data size here, the size will be 
added to memtable
    * before inserting.
    */
+  @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity 
warning
   public static long getRecordSize(
       InsertTabletPlan insertTabletPlan, int start, int end, boolean 
addingTextDataSize) {
     if (insertTabletPlan.getMeasurementMNodes() == null) {
@@ -133,6 +138,10 @@ public class MemUtils {
     return memSize;
   }
 
+  /**
+   * This method is for test only. This reason is the InsertTabletPlan in 
tests may doesn't have
+   * MeasurementMNodes
+   */
   public static long getRecordSizeForTest(
       InsertTabletPlan insertTabletPlan, int start, int end, boolean 
addingTextDataSize) {
     if (start >= end) {
diff --git a/server/src/main/java/org/apache/iotdb/db/utils/SchemaUtils.java 
b/server/src/main/java/org/apache/iotdb/db/utils/SchemaUtils.java
index 92e5f3a..c02ac81 100644
--- a/server/src/main/java/org/apache/iotdb/db/utils/SchemaUtils.java
+++ b/server/src/main/java/org/apache/iotdb/db/utils/SchemaUtils.java
@@ -158,7 +158,6 @@ public class SchemaUtils {
    * @param measurementDataType
    * @param aggregation
    * @return
-   * @throws MetadataException
    */
   public static List<TSDataType> getAggregatedDataTypes(
       List<TSDataType> measurementDataType, String aggregation) {
diff --git a/server/src/main/java/org/apache/iotdb/db/utils/SerializeUtils.java 
b/server/src/main/java/org/apache/iotdb/db/utils/SerializeUtils.java
index d876bc6..86e6c6e 100644
--- a/server/src/main/java/org/apache/iotdb/db/utils/SerializeUtils.java
+++ b/server/src/main/java/org/apache/iotdb/db/utils/SerializeUtils.java
@@ -117,6 +117,7 @@ public class SerializeUtils {
     }
   }
 
+  @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity 
warning
   public static void serializeBatchData(BatchData batchData, DataOutputStream 
outputStream) {
     try {
       int length = batchData.length();
@@ -204,6 +205,7 @@ public class SerializeUtils {
     }
   }
 
+  @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity 
warning
   public static BatchData deserializeBatchData(ByteBuffer buffer) {
     if (buffer == null || (buffer.limit() - buffer.position()) == 0) {
       return null;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/utils/datastructure/TVList.java 
b/server/src/main/java/org/apache/iotdb/db/utils/datastructure/TVList.java
index 0df6783..396146f 100644
--- a/server/src/main/java/org/apache/iotdb/db/utils/datastructure/TVList.java
+++ b/server/src/main/java/org/apache/iotdb/db/utils/datastructure/TVList.java
@@ -93,7 +93,13 @@ public abstract class TVList {
     return size;
   }
 
-  public static long vectorTVListArrayMemSize(List<TSDataType> types) {
+  /**
+   * For Vector data type
+   *
+   * @param types the types in the vector
+   * @return VectorTvListArrayMemSize
+   */
+  public static long vectorTvListArrayMemSize(List<TSDataType> types) {
     long size = 0;
     // time size
     size += (long) PrimitiveArrayManager.ARRAY_SIZE * 8L;
@@ -215,7 +221,7 @@ public abstract class TVList {
     throw new UnsupportedOperationException(ERR_DATATYPE_NOT_CONSISTENT);
   }
 
-  public TVList getTVListByColumnIndex(List<Integer> columnIndexList) {
+  public TVList getTvListByColumnIndex(List<Integer> columnIndexList) {
     throw new UnsupportedOperationException(ERR_DATATYPE_NOT_CONSISTENT);
   }
 
diff --git 
a/server/src/main/java/org/apache/iotdb/db/utils/datastructure/VectorTVList.java
 
b/server/src/main/java/org/apache/iotdb/db/utils/datastructure/VectorTVList.java
index ee4145a..dfe599d 100644
--- 
a/server/src/main/java/org/apache/iotdb/db/utils/datastructure/VectorTVList.java
+++ 
b/server/src/main/java/org/apache/iotdb/db/utils/datastructure/VectorTVList.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb.db.utils.datastructure;
 
 import org.apache.iotdb.db.rescon.PrimitiveArrayManager;
@@ -55,6 +56,7 @@ public class VectorTVList extends TVList {
     }
   }
 
+  @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity 
warning
   @Override
   public void putVector(long timestamp, Object[] value) {
     checkExpansion();
@@ -170,7 +172,7 @@ public class VectorTVList extends TVList {
   }
 
   @Override
-  public TVList getTVListByColumnIndex(List<Integer> columns) {
+  public TVList getTvListByColumnIndex(List<Integer> columns) {
     List<TSDataType> types = new ArrayList<>();
     List<List<Object>> values = new ArrayList<>();
     List<List<BitMap>> bitMaps = null;
@@ -197,9 +199,11 @@ public class VectorTVList extends TVList {
   }
 
   /**
+   * Get the int value at this position in VectorTvList
+   *
    * @param rowIndex value index inside this column
    * @param columnIndex index of the column
-   * @return
+   * @return the value at this position in VectorTvList
    */
   public int getIntByValueIndex(int rowIndex, int columnIndex) {
     int arrayIndex = rowIndex / ARRAY_SIZE;
@@ -208,6 +212,13 @@ public class VectorTVList extends TVList {
     return ((int[]) columnValues.get(arrayIndex))[elementIndex];
   }
 
+  /**
+   * Get the long value at this position in VectorTvList
+   *
+   * @param rowIndex value index inside this column
+   * @param columnIndex index of the column
+   * @return the value at this position in VectorTvList
+   */
   public long getLongByValueIndex(int rowIndex, int columnIndex) {
     int arrayIndex = rowIndex / ARRAY_SIZE;
     int elementIndex = rowIndex % ARRAY_SIZE;
@@ -215,6 +226,13 @@ public class VectorTVList extends TVList {
     return ((long[]) columnValues.get(arrayIndex))[elementIndex];
   }
 
+  /**
+   * Get the float value at this position in VectorTvList
+   *
+   * @param rowIndex value index inside this column
+   * @param columnIndex index of the column
+   * @return the value at this position in VectorTvList
+   */
   public float getFloatByValueIndex(int rowIndex, int columnIndex) {
     int arrayIndex = rowIndex / ARRAY_SIZE;
     int elementIndex = rowIndex % ARRAY_SIZE;
@@ -222,6 +240,13 @@ public class VectorTVList extends TVList {
     return ((float[]) columnValues.get(arrayIndex))[elementIndex];
   }
 
+  /**
+   * Get the double value at this position in VectorTvList
+   *
+   * @param rowIndex value index inside this column
+   * @param columnIndex index of the column
+   * @return the value at this position in VectorTvList
+   */
   public double getDoubleByValueIndex(int rowIndex, int columnIndex) {
     int arrayIndex = rowIndex / ARRAY_SIZE;
     int elementIndex = rowIndex % ARRAY_SIZE;
@@ -229,6 +254,13 @@ public class VectorTVList extends TVList {
     return ((double[]) columnValues.get(arrayIndex))[elementIndex];
   }
 
+  /**
+   * Get the Binary value at this position in VectorTvList
+   *
+   * @param rowIndex value index inside this column
+   * @param columnIndex index of the column
+   * @return the value at this position in VectorTvList
+   */
   public Binary getBinaryByValueIndex(int rowIndex, int columnIndex) {
     int arrayIndex = rowIndex / ARRAY_SIZE;
     int elementIndex = rowIndex % ARRAY_SIZE;
@@ -236,6 +268,13 @@ public class VectorTVList extends TVList {
     return ((Binary[]) columnValues.get(arrayIndex))[elementIndex];
   }
 
+  /**
+   * Get the boolean value at this position in VectorTvList
+   *
+   * @param rowIndex value index inside this column
+   * @param columnIndex index of the column
+   * @return the value at this position in VectorTvList
+   */
   public boolean getBooleanByValueIndex(int rowIndex, int columnIndex) {
     int arrayIndex = rowIndex / ARRAY_SIZE;
     int elementIndex = rowIndex % ARRAY_SIZE;
@@ -243,6 +282,13 @@ public class VectorTVList extends TVList {
     return ((boolean[]) columnValues.get(arrayIndex))[elementIndex];
   }
 
+  /**
+   * Get whether value is marked at this position in VectorTvList
+   *
+   * @param rowIndex value index inside this column
+   * @param columnIndex index of the column
+   * @return boolean
+   */
   public boolean isValueMarked(int rowIndex, int columnIndex) {
     if (rowIndex >= size) {
       return false;
@@ -271,6 +317,7 @@ public class VectorTVList extends TVList {
     indices.get(arrayIndex)[elementIndex] = value;
   }
 
+  @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity 
warning
   @Override
   public VectorTVList clone() {
     VectorTVList cloneList = new VectorTVList(dataTypes);
@@ -478,11 +525,12 @@ public class VectorTVList extends TVList {
   @Override
   protected void releaseLastValueArray() {
     PrimitiveArrayManager.release(indices.remove(indices.size() - 1));
-    for (int i = 0; i < dataTypes.size(); i++) {
-      PrimitiveArrayManager.release(values.get(i).remove(values.get(i).size() 
- 1));
+    for (List<Object> valueList : values) {
+      PrimitiveArrayManager.release(valueList.remove(valueList.size() - 1));
     }
   }
 
+  @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity 
warning
   @Override
   public void putVectors(long[] time, BitMap[] bitMaps, Object[] value, int 
start, int end) {
     checkExpansion();
@@ -539,27 +587,27 @@ public class VectorTVList extends TVList {
       switch (dataTypes.get(i)) {
         case TEXT:
           Binary[] arrayT = ((Binary[]) columnValues.get(arrayIndex));
-          System.arraycopy((Binary[]) value[i], idx, arrayT, elementIndex, 
remaining);
+          System.arraycopy(value[i], idx, arrayT, elementIndex, remaining);
           break;
         case FLOAT:
           float[] arrayF = ((float[]) columnValues.get(arrayIndex));
-          System.arraycopy((float[]) value[i], idx, arrayF, elementIndex, 
remaining);
+          System.arraycopy(value[i], idx, arrayF, elementIndex, remaining);
           break;
         case INT32:
           int[] arrayI = ((int[]) columnValues.get(arrayIndex));
-          System.arraycopy((int[]) value[i], idx, arrayI, elementIndex, 
remaining);
+          System.arraycopy(value[i], idx, arrayI, elementIndex, remaining);
           break;
         case INT64:
           long[] arrayL = ((long[]) columnValues.get(arrayIndex));
-          System.arraycopy((long[]) value[i], idx, arrayL, elementIndex, 
remaining);
+          System.arraycopy(value[i], idx, arrayL, elementIndex, remaining);
           break;
         case DOUBLE:
           double[] arrayD = ((double[]) columnValues.get(arrayIndex));
-          System.arraycopy((double[]) value[i], idx, arrayD, elementIndex, 
remaining);
+          System.arraycopy(value[i], idx, arrayD, elementIndex, remaining);
           break;
         case BOOLEAN:
           boolean[] arrayB = ((boolean[]) columnValues.get(arrayIndex));
-          System.arraycopy((boolean[]) value[i], idx, arrayB, elementIndex, 
remaining);
+          System.arraycopy(value[i], idx, arrayB, elementIndex, remaining);
           break;
         default:
           break;
diff --git 
a/server/src/main/java/org/apache/iotdb/db/writelog/recover/LogReplayer.java 
b/server/src/main/java/org/apache/iotdb/db/writelog/recover/LogReplayer.java
index 0a7f078..e9a6e5b 100644
--- a/server/src/main/java/org/apache/iotdb/db/writelog/recover/LogReplayer.java
+++ b/server/src/main/java/org/apache/iotdb/db/writelog/recover/LogReplayer.java
@@ -198,7 +198,6 @@ public class LogReplayer {
                     + IoTDBConstant.PATH_SEPARATOR
                     + tPlan.getMeasurements()[i]));
         columnIndex++;
-        continue;
       } else if (mNodes[i].getSchema().getType() == TSDataType.VECTOR) {
         List<TSDataType> datatypes = 
mNodes[i].getSchema().getValueTSDataTypeList();
         for (int j = 0; j < datatypes.size(); j++) {
@@ -214,7 +213,6 @@ public class LogReplayer {
           }
           columnIndex++;
         }
-        continue;
       } else if (mNodes[i].getSchema().getType() != 
tPlan.getDataTypes()[columnIndex]) {
         tPlan.markFailedMeasurementInsertion(
             i,
@@ -222,8 +220,10 @@ public class LogReplayer {
                 mNodes[i].getName(),
                 tPlan.getDataTypes()[columnIndex],
                 mNodes[i].getSchema().getType()));
+        columnIndex++;
+      } else {
+        columnIndex++;
       }
-      columnIndex++;
     }
   }
 }
diff --git 
a/server/src/test/java/org/apache/iotdb/db/engine/memtable/PrimitiveMemTableTest.java
 
b/server/src/test/java/org/apache/iotdb/db/engine/memtable/PrimitiveMemTableTest.java
index 98ac2da..963d2bb 100644
--- 
a/server/src/test/java/org/apache/iotdb/db/engine/memtable/PrimitiveMemTableTest.java
+++ 
b/server/src/test/java/org/apache/iotdb/db/engine/memtable/PrimitiveMemTableTest.java
@@ -71,7 +71,7 @@ public class PrimitiveMemTableTest {
     for (int i = 0; i < count; i++) {
       series.write(i, i);
     }
-    IPointReader it = series.getSortedTVListForQuery().getIterator();
+    IPointReader it = series.getSortedTvListForQuery().getIterator();
     int i = 0;
     while (it.hasNextTimeValuePair()) {
       Assert.assertEquals(i, it.nextTimeValuePair().getTimestamp());
diff --git 
a/server/src/test/java/org/apache/iotdb/db/metadata/MManagerBasicTest.java 
b/server/src/test/java/org/apache/iotdb/db/metadata/MManagerBasicTest.java
index a512f6d..ab13c55 100644
--- a/server/src/test/java/org/apache/iotdb/db/metadata/MManagerBasicTest.java
+++ b/server/src/test/java/org/apache/iotdb/db/metadata/MManagerBasicTest.java
@@ -240,6 +240,7 @@ public class MManagerBasicTest {
     assertFalse(manager.isPathExist(new PartialPath("root.1")));
   }
 
+  @SuppressWarnings("squid:S3776") // Suppress high Cognitive Complexity 
warning
   @Test
   public void testCreateAlignedTimeseries() throws IllegalPathException {
     MManager manager = IoTDB.metaManager;
diff --git a/tsfile/src/main/java/org/apache/iotdb/tsfile/utils/Binary.java 
b/tsfile/src/main/java/org/apache/iotdb/tsfile/utils/Binary.java
index fde1041..0411e40 100644
--- a/tsfile/src/main/java/org/apache/iotdb/tsfile/utils/Binary.java
+++ b/tsfile/src/main/java/org/apache/iotdb/tsfile/utils/Binary.java
@@ -30,7 +30,7 @@ import java.util.Arrays;
 public class Binary implements Comparable<Binary>, Serializable {
 
   private static final long serialVersionUID = 6394197743397020735L;
-  public static Binary EMPTY_VALUE = new Binary("");
+  public static final Binary EMPTY_VALUE = new Binary("");
 
   private byte[] values;
 
diff --git a/tsfile/src/main/java/org/apache/iotdb/tsfile/utils/BitMap.java 
b/tsfile/src/main/java/org/apache/iotdb/tsfile/utils/BitMap.java
index 5177260..a7f2589 100644
--- a/tsfile/src/main/java/org/apache/iotdb/tsfile/utils/BitMap.java
+++ b/tsfile/src/main/java/org/apache/iotdb/tsfile/utils/BitMap.java
@@ -16,6 +16,7 @@
  * specific language governing permissions and limitations
  * under the License.
  */
+
 package org.apache.iotdb.tsfile.utils;
 
 import java.util.Arrays;
@@ -109,7 +110,7 @@ public class BitMap {
 
   @Override
   public String toString() {
-    StringBuffer res = new StringBuffer();
+    StringBuilder res = new StringBuilder();
     for (int i = 0; i < size; i++) {
       res.append(isMarked(i) ? 1 : 0);
     }

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