java/tsfile/src/main/java/org/apache/tsfile/write/chunk/ChunkWriterImpl.java [320:341]:
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    try {
      if (numOfPages == 0) { // record the firstPageStatistics
        this.firstPageStatistics = pageWriter.getStatistics();
        this.sizeWithoutStatistic = pageWriter.writePageHeaderAndDataIntoBuff(pageBuffer, true);
      } 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);
        pageWriter.writePageHeaderAndDataIntoBuff(pageBuffer, false);
        firstPageStatistics = null;
      } else {
        pageWriter.writePageHeaderAndDataIntoBuff(pageBuffer, false);
      }

      // update statistics of this chunk
      numOfPages++;
      this.statistics.mergeStatistics(pageWriter.getStatistics());
    } catch (IOException e) {
      logger.error("meet error in pageWriter.writePageHeaderAndDataIntoBuff,ignore this page:", e);
    } finally {
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java/tsfile/src/main/java/org/apache/tsfile/write/chunk/TimeChunkWriter.java [183:204]:
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    try {
      if (numOfPages == 0) { // record the firstPageStatistics
        this.firstPageStatistics = pageWriter.getStatistics();
        this.sizeWithoutStatistic = pageWriter.writePageHeaderAndDataIntoBuff(pageBuffer, true);
      } 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);
        pageWriter.writePageHeaderAndDataIntoBuff(pageBuffer, false);
        firstPageStatistics = null;
      } else {
        pageWriter.writePageHeaderAndDataIntoBuff(pageBuffer, false);
      }

      // update statistics of this chunk
      numOfPages++;
      this.statistics.mergeStatistics(pageWriter.getStatistics());
    } catch (IOException e) {
      logger.error("meet error in pageWriter.writePageHeaderAndDataIntoBuff,ignore this page:", e);
    } finally {
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