java/tsfile/src/main/java/org/apache/tsfile/write/chunk/ChunkWriterImpl.java [424:452]:
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  public void writePageHeaderAndDataIntoBuff(ByteBuffer data, PageHeader header)
      throws PageException {
    // write the page header to pageBuffer
    try {
      logger.debug(
          "start to flush a page header into buffer, buffer position {} ", pageBuffer.size());
      // serialize pageHeader  see writePageToPageBuffer method
      if (numOfPages == 0) { // record the firstPageStatistics
        this.firstPageStatistics = header.getStatistics();
        this.sizeWithoutStatistic +=
            ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getUncompressedSize(), pageBuffer);
        this.sizeWithoutStatistic +=
            ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getCompressedSize(), pageBuffer);
      } else if (numOfPages == 1) { // put the firstPageStatistics into pageBuffer
        byte[] b = pageBuffer.toByteArray();
        pageBuffer.reset();
        pageBuffer.write(b, 0, this.sizeWithoutStatistic);
        firstPageStatistics.serialize(pageBuffer);
        pageBuffer.write(b, this.sizeWithoutStatistic, b.length - this.sizeWithoutStatistic);
        ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getUncompressedSize(), pageBuffer);
        ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getCompressedSize(), pageBuffer);
        header.getStatistics().serialize(pageBuffer);
        firstPageStatistics = null;
      } else {
        ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getUncompressedSize(), pageBuffer);
        ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getCompressedSize(), pageBuffer);
        header.getStatistics().serialize(pageBuffer);
      }
      logger.debug(
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java/tsfile/src/main/java/org/apache/tsfile/write/chunk/TimeChunkWriter.java [210:238]:
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  public void writePageHeaderAndDataIntoBuff(ByteBuffer data, PageHeader header)
      throws PageException {
    // write the page header to pageBuffer
    try {
      logger.debug(
          "start to flush a page header into buffer, buffer position {} ", pageBuffer.size());
      // serialize pageHeader  see writePageToPageBuffer method
      if (numOfPages == 0) { // record the firstPageStatistics
        this.firstPageStatistics = header.getStatistics();
        this.sizeWithoutStatistic +=
            ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getUncompressedSize(), pageBuffer);
        this.sizeWithoutStatistic +=
            ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getCompressedSize(), pageBuffer);
      } else if (numOfPages == 1) { // put the firstPageStatistics into pageBuffer
        byte[] b = pageBuffer.toByteArray();
        pageBuffer.reset();
        pageBuffer.write(b, 0, this.sizeWithoutStatistic);
        firstPageStatistics.serialize(pageBuffer);
        pageBuffer.write(b, this.sizeWithoutStatistic, b.length - this.sizeWithoutStatistic);
        ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getUncompressedSize(), pageBuffer);
        ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getCompressedSize(), pageBuffer);
        header.getStatistics().serialize(pageBuffer);
        firstPageStatistics = null;
      } else {
        ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getUncompressedSize(), pageBuffer);
        ReadWriteForEncodingUtils.writeUnsignedVarInt(header.getCompressedSize(), pageBuffer);
        header.getStatistics().serialize(pageBuffer);
      }
      logger.debug(
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