public void merge(BloomFilter that) {
    if (this != that && this.numBits == that.numBits && this.numHashFunctions == that.numHashFunctions) {
      this.bitSet.putAll(that.bitSet);
    } else {
      throw new IllegalArgumentException("BloomFilters are not compatible for merging." +
          " this - " + this.toString() + " that - " + that.toString());
    }
  }
Merge the specified bloom filter with current bloom filter.

@param that - bloom filter to merge
storage-api/src/java/org/apache/hive/common/util/BloomFilter.java