vector/src/main/java/org/apache/arrow/vector/BaseVariableWidthVector.java [607:634]:
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  public void reallocValidityAndOffsetBuffers() {
    int targetOffsetCount = capAtMaxInt((offsetBuffer.capacity() / OFFSET_WIDTH) * 2);
    if (targetOffsetCount == 0) {
      if (lastValueCapacity > 0) {
        targetOffsetCount = (lastValueCapacity + 1);
      } else {
        targetOffsetCount = 2 * (INITIAL_VALUE_ALLOCATION + 1);
      }
    }
    computeAndCheckOffsetsBufferSize(targetOffsetCount);

    DataAndValidityBuffers buffers = allocFixedDataAndValidityBufs(targetOffsetCount, OFFSET_WIDTH);
    final ArrowBuf newOffsetBuffer = buffers.getDataBuf();
    newOffsetBuffer.setBytes(0, offsetBuffer, 0, offsetBuffer.capacity());
    newOffsetBuffer.setZero(
        offsetBuffer.capacity(), newOffsetBuffer.capacity() - offsetBuffer.capacity());
    offsetBuffer.getReferenceManager().release();
    offsetBuffer = newOffsetBuffer;

    final ArrowBuf newValidityBuffer = buffers.getValidityBuf();
    newValidityBuffer.setBytes(0, validityBuffer, 0, validityBuffer.capacity());
    newValidityBuffer.setZero(
        validityBuffer.capacity(), newValidityBuffer.capacity() - validityBuffer.capacity());
    validityBuffer.getReferenceManager().release();
    validityBuffer = newValidityBuffer;

    lastValueCapacity = getValueCapacity();
  }
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vector/src/main/java/org/apache/arrow/vector/BaseLargeVariableWidthVector.java [567:594]:
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  public void reallocValidityAndOffsetBuffers() {
    int targetOffsetCount = capAtMaxInt((offsetBuffer.capacity() / OFFSET_WIDTH) * 2);
    if (targetOffsetCount == 0) {
      if (lastValueCapacity > 0) {
        targetOffsetCount = (lastValueCapacity + 1);
      } else {
        targetOffsetCount = 2 * (INITIAL_VALUE_ALLOCATION + 1);
      }
    }
    computeAndCheckOffsetsBufferSize(targetOffsetCount);

    DataAndValidityBuffers buffers = allocFixedDataAndValidityBufs(targetOffsetCount, OFFSET_WIDTH);
    final ArrowBuf newOffsetBuffer = buffers.getDataBuf();
    newOffsetBuffer.setBytes(0, offsetBuffer, 0, offsetBuffer.capacity());
    newOffsetBuffer.setZero(
        offsetBuffer.capacity(), newOffsetBuffer.capacity() - offsetBuffer.capacity());
    offsetBuffer.getReferenceManager().release();
    offsetBuffer = newOffsetBuffer;

    final ArrowBuf newValidityBuffer = buffers.getValidityBuf();
    newValidityBuffer.setBytes(0, validityBuffer, 0, validityBuffer.capacity());
    newValidityBuffer.setZero(
        validityBuffer.capacity(), newValidityBuffer.capacity() - validityBuffer.capacity());
    validityBuffer.getReferenceManager().release();
    validityBuffer = newValidityBuffer;

    lastValueCapacity = getValueCapacity();
  }
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