private static boolean entryEqual(byte[][] t, int hash, byte[] b, int start, int len) {
    return t[hash] != null && StringExpr.equal(t[hash], 0, t[hash].length, 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