@Override
  public void setScratchBytesColumn(int scratchBytesColumn) {

    // Tell our super class FilterStringColumnInList it will be evaluating our scratch
    // BytesColumnVector.
    this.inputColumnNum[0] = scratchBytesColumn;
    this.scratchBytesColumn = scratchBytesColumn;
  }
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/StructColumnInList.java