@Override
  public void transientInit(Configuration conf) throws HiveException {
    super.transientInit(conf);

    inSet = new CuckooSetLong(inListValues.length);
    inSet.load(inListValues);
  }
After construction you must call setInListValues() to add the values to the IN set.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/FilterLongColumnInList.java