java/tsfile/src/main/java/org/apache/tsfile/read/common/block/column/BooleanColumn.java [111:148]:
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  @Override
  public boolean mayHaveNull() {
    return valueIsNull != null;
  }

  @Override
  public boolean isNull(int position) {
    return valueIsNull != null && valueIsNull[position + arrayOffset];
  }

  @Override
  public boolean[] isNull() {
    if (valueIsNull == null) {
      boolean[] res = new boolean[positionCount];
      Arrays.fill(res, false);
      return res;
    }
    return valueIsNull;
  }

  @Override
  public int getPositionCount() {
    return positionCount;
  }

  @Override
  public long getRetainedSizeInBytes() {
    return retainedSizeInBytes;
  }

  @Override
  public long getSizeInBytes() {
    return (long) positionCount * SIZE_IN_BYTES_PER_POSITION;
  }

  @Override
  public Column getRegion(int positionOffset, int length) {
    checkValidRegion(getPositionCount(), positionOffset, length);
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java/tsfile/src/main/java/org/apache/tsfile/read/common/block/column/IntColumn.java [155:192]:
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  @Override
  public boolean mayHaveNull() {
    return valueIsNull != null;
  }

  @Override
  public boolean isNull(int position) {
    return valueIsNull != null && valueIsNull[position + arrayOffset];
  }

  @Override
  public boolean[] isNull() {
    if (valueIsNull == null) {
      boolean[] res = new boolean[positionCount];
      Arrays.fill(res, false);
      return res;
    }
    return valueIsNull;
  }

  @Override
  public int getPositionCount() {
    return positionCount;
  }

  @Override
  public long getRetainedSizeInBytes() {
    return retainedSizeInBytes;
  }

  @Override
  public long getSizeInBytes() {
    return (long) positionCount * SIZE_IN_BYTES_PER_POSITION;
  }

  @Override
  public Column getRegion(int positionOffset, int length) {
    checkValidRegion(getPositionCount(), positionOffset, length);
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