BloomContext#sanityCheck may failed when use ROWPREFIX_DELIMITED bloom filter

row1: 12345xxx
row2: 1235xxxx

row1's key for bloom filter: 1234
row2's key for bloom fitler: 123

private void sanityCheck(Cell cell) throws IOException {
  if (this.getLastCell() != null) {
    LOG.debug("Current cell " + cell + ", prevCell = " + this.getLastCell());
    if (comparator.compare(cell, this.getLastCell()) <= 0) {
      throw new IOException("Added a key not lexically larger than" + " previous. Current cell = "
          + cell + ", prevCell = " + this.getLastCell());
    }
  }
}