public boolean lookup(byte[] b, int start, int len) {
    if (len < minLen || len > maxLen) {
      return false;
    }

    return entryEqual(t1, h1(b, start, len), b, start, len)
        || entryEqual(t2, h2(b, start, len), b, start, len);
  }
Return true if and only if the value in byte array b beginning at start
and ending at start+len is present in the set.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/CuckooSetBytes.java