vector/src/main/java/org/apache/arrow/vector/complex/ListViewVector.java [543:609]:
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      int firstByteSource = BitVectorHelper.byteIndex(startIndex);
      int lastByteSource = BitVectorHelper.byteIndex(valueCount - 1);
      int byteSizeTarget = getValidityBufferSizeFromCount(length);
      int offset = startIndex % 8;

      if (length > 0) {
        if (offset == 0) {
          // slice
          if (target.validityBuffer != null) {
            target.validityBuffer.getReferenceManager().release();
          }
          target.validityBuffer = validityBuffer.slice(firstByteSource, byteSizeTarget);
          target.validityBuffer.getReferenceManager().retain(1);
        } else {
          /* Copy data
           * When the first bit starts from the middle of a byte (offset != 0),
           * copy data from src BitVector.
           * Each byte in the target is composed by a part in i-th byte,
           * another part in (i+1)-th byte.
           */
          target.allocateValidityBuffer(byteSizeTarget);

          for (int i = 0; i < byteSizeTarget - 1; i++) {
            byte b1 =
                BitVectorHelper.getBitsFromCurrentByte(validityBuffer, firstByteSource + i, offset);
            byte b2 =
                BitVectorHelper.getBitsFromNextByte(
                    validityBuffer, firstByteSource + i + 1, offset);

            target.validityBuffer.setByte(i, (b1 + b2));
          }

          /* Copying the last piece is done in the following manner:
           * if the source vector has 1 or more bytes remaining, we copy
           * the last piece as a byte formed by shifting data
           * from the current byte and the next byte.
           *
           * if the source vector has no more bytes remaining
           * (we are at the last byte), we copy the last piece as a byte
           * by shifting data from the current byte.
           */
          if ((firstByteSource + byteSizeTarget - 1) < lastByteSource) {
            byte b1 =
                BitVectorHelper.getBitsFromCurrentByte(
                    validityBuffer, firstByteSource + byteSizeTarget - 1, offset);
            byte b2 =
                BitVectorHelper.getBitsFromNextByte(
                    validityBuffer, firstByteSource + byteSizeTarget, offset);

            target.validityBuffer.setByte(byteSizeTarget - 1, b1 + b2);
          } else {
            byte b1 =
                BitVectorHelper.getBitsFromCurrentByte(
                    validityBuffer, firstByteSource + byteSizeTarget - 1, offset);
            target.validityBuffer.setByte(byteSizeTarget - 1, b1);
          }
        }
      }
    }

    @Override
    public ValueVector getTo() {
      return to;
    }

    @Override
    public void copyValueSafe(int from, int to) {
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vector/src/main/java/org/apache/arrow/vector/complex/MapVector.java [239:305]:
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      int firstByteSource = BitVectorHelper.byteIndex(startIndex);
      int lastByteSource = BitVectorHelper.byteIndex(valueCount - 1);
      int byteSizeTarget = getValidityBufferSizeFromCount(length);
      int offset = startIndex % 8;

      if (length > 0) {
        if (offset == 0) {
          // slice
          if (target.validityBuffer != null) {
            target.validityBuffer.getReferenceManager().release();
          }
          target.validityBuffer = validityBuffer.slice(firstByteSource, byteSizeTarget);
          target.validityBuffer.getReferenceManager().retain(1);
        } else {
          /* Copy data
           * When the first bit starts from the middle of a byte (offset != 0),
           * copy data from src BitVector.
           * Each byte in the target is composed by a part in i-th byte,
           * another part in (i+1)-th byte.
           */
          target.allocateValidityBuffer(byteSizeTarget);

          for (int i = 0; i < byteSizeTarget - 1; i++) {
            byte b1 =
                BitVectorHelper.getBitsFromCurrentByte(validityBuffer, firstByteSource + i, offset);
            byte b2 =
                BitVectorHelper.getBitsFromNextByte(
                    validityBuffer, firstByteSource + i + 1, offset);

            target.validityBuffer.setByte(i, (b1 + b2));
          }

          /* Copying the last piece is done in the following manner:
           * if the source vector has 1 or more bytes remaining, we copy
           * the last piece as a byte formed by shifting data
           * from the current byte and the next byte.
           *
           * if the source vector has no more bytes remaining
           * (we are at the last byte), we copy the last piece as a byte
           * by shifting data from the current byte.
           */
          if ((firstByteSource + byteSizeTarget - 1) < lastByteSource) {
            byte b1 =
                BitVectorHelper.getBitsFromCurrentByte(
                    validityBuffer, firstByteSource + byteSizeTarget - 1, offset);
            byte b2 =
                BitVectorHelper.getBitsFromNextByte(
                    validityBuffer, firstByteSource + byteSizeTarget, offset);

            target.validityBuffer.setByte(byteSizeTarget - 1, b1 + b2);
          } else {
            byte b1 =
                BitVectorHelper.getBitsFromCurrentByte(
                    validityBuffer, firstByteSource + byteSizeTarget - 1, offset);
            target.validityBuffer.setByte(byteSizeTarget - 1, b1);
          }
        }
      }
    }

    @Override
    public ValueVector getTo() {
      return to;
    }

    @Override
    public void copyValueSafe(int from, int to) {
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