public String formatTestingStats() {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < numChunks; ++i) {
      sb.append("chunk #");
      sb.append(i);
      sb.append(": queries=");
      sb.append(numQueriesPerChunk[i]);
      sb.append(", positives=");
      sb.append(numPositivesPerChunk[i]);
      sb.append(", positiveRatio=");
      sb.append(numPositivesPerChunk[i] * 1.0 / numQueriesPerChunk[i]);
      sb.append(";\n");
    }
    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