[GitHub] [incubator-iotdb] SilverNarcissus commented on a change in pull request #553: [IOTDB-279] Merge TsDigest into Statistics

[GitBox <gi...@apache.org>]

SilverNarcissus commented on a change in pull request #553: [IOTDB-279] Merge TsDigest into Statistics
URL: https://github.com/apache/incubator-iotdb/pull/553#discussion_r347696842
 
 

 ##########
 File path: tsfile/src/main/java/org/apache/iotdb/tsfile/file/metadata/statistics/Statistics.java
 ##########
 @@ -299,4 +312,272 @@ public int serialize(OutputStream outputStream) throws IOException {
     }
     return length;
   }
+
+  public static int getNullDigestSize() {
+    return Integer.BYTES;
+  }
+
+  public static int serializeNullTo(OutputStream outputStream) throws IOException {
+    return ReadWriteIOUtils.write(0, outputStream);
+  }
+
+  public static int serializeNullTo(ByteBuffer buffer) {
+    return ReadWriteIOUtils.write(0, buffer);
+  }
+
+  /**
+   * use given input stream to deserialize.
+   *
+   * @param inputStream -given input stream
+   * @return -an instance of TsDigest
+   */
+  public static Statistics deserializeFrom(InputStream inputStream, TSDataType dataType) throws IOException {
+    Statistics digest = getStatsByType(dataType);
+    int size = ReadWriteIOUtils.readInt(inputStream);
+    digest.validSizeOfArray = size;
+    digest.digestSerializedSize = Integer.BYTES;
+    if (size > 0) {
+      digest.statistics = new ByteBuffer[StatisticType.getTotalTypeNum()];
+      ByteBuffer value;
+      // check if it's an old version of TsFile
+      String key = "";
+      if (TSFileDescriptor.getInstance().getConfig().getEndian().equals("LITTLE_ENDIAN")) {
 
 Review comment:
   You should use EndianType.LITTLE_ENDIAN.toString() rather than "LITTLE_ENDIAN"

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