@Override
  public String toString() {
    StringBuilder sb = new StringBuilder();
    sb.append(BloomFilterUtil.formatStats(this));
    sb.append(BloomFilterUtil.STATS_RECORD_SEP + "Number of chunks: " + numChunks);
    sb.append(BloomFilterUtil.STATS_RECORD_SEP + ((comparator != null)
      ? "Comparator: " + comparator.getClass().getSimpleName()
      : "Comparator: " + Bytes.BYTES_RAWCOMPARATOR.getClass().getSimpleName()));
    return sb.toString();
  }
De-serialization for compound Bloom filter metadata. Must be consistent with what
{@link CompoundBloomFilterWriter} does.
@param meta    serialized Bloom filter metadata without any magic blocks
@param reader  reader for hfile
@param metrics for collecting bloom filter metrics. may be null
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/CompoundBloomFilter.java