vector/src/main/java/org/apache/arrow/vector/BaseVariableWidthVector.java [495:510]:
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  private void allocateBytes(final long valueBufferSize, final int valueCount) {
    /* allocate data buffer */
    long curSize = valueBufferSize;
    valueBuffer = allocator.buffer(curSize);
    valueBuffer.readerIndex(0);

    /* allocate offset buffer and validity buffer */
    DataAndValidityBuffers buffers = allocFixedDataAndValidityBufs(valueCount + 1, OFFSET_WIDTH);
    offsetBuffer = buffers.getDataBuf();
    validityBuffer = buffers.getValidityBuf();
    initOffsetBuffer();
    initValidityBuffer();

    lastValueCapacity = getValueCapacity();
    lastValueAllocationSizeInBytes = capAtMaxInt(valueBuffer.capacity());
  }
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vector/src/main/java/org/apache/arrow/vector/BaseLargeVariableWidthVector.java [478:493]:
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  private void allocateBytes(final long valueBufferSize, final int valueCount) {
    /* allocate data buffer */
    long curSize = valueBufferSize;
    valueBuffer = allocator.buffer(curSize);
    valueBuffer.readerIndex(0);

    /* allocate offset buffer and validity buffer */
    DataAndValidityBuffers buffers = allocFixedDataAndValidityBufs(valueCount + 1, OFFSET_WIDTH);
    offsetBuffer = buffers.getDataBuf();
    validityBuffer = buffers.getValidityBuf();
    initOffsetBuffer();
    initValidityBuffer();

    lastValueCapacity = getValueCapacity();
    lastValueAllocationSizeInBytes = capAtMaxInt(valueBuffer.capacity());
  }
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