@Test
  public void testInFiltersAndExprs() throws HiveException {
    ExprNodeColumnDesc col1Expr = new  ExprNodeColumnDesc(String.class, "col1", "table", false);
    ExprNodeConstantDesc constDesc = new ExprNodeConstantDesc("Alpha");
    ExprNodeConstantDesc constDesc2 = new ExprNodeConstantDesc("Bravo");

    // string IN
    GenericUDFIn udf = new GenericUDFIn();
    List<ExprNodeDesc> children1 = new ArrayList<ExprNodeDesc>();
    children1.add(col1Expr);
    children1.add(constDesc);
    children1.add(constDesc2);
    ExprNodeGenericFuncDesc exprDesc = new ExprNodeGenericFuncDesc(TypeInfoFactory.booleanTypeInfo,
        udf, children1);

    List<String> columns = new ArrayList<String>();
    columns.add("col0");
    columns.add("col1");
    columns.add("col2");
    VectorizationContext vc = new VectorizationContext("name", columns);
    VectorExpression ve = vc.getVectorExpression(exprDesc, VectorExpressionDescriptor.Mode.FILTER);
    assertTrue(ve instanceof FilterStringColumnInList);
    ve = vc.getVectorExpression(exprDesc, VectorExpressionDescriptor.Mode.PROJECTION);
    assertTrue(ve instanceof StringColumnInList);

    // long IN
    children1.set(0, new ExprNodeColumnDesc(Long.class, "col1", "table", false));
    children1.set(1, new ExprNodeConstantDesc(10));
    children1.set(2, new ExprNodeConstantDesc(20));
    ve = vc.getVectorExpression(exprDesc, VectorExpressionDescriptor.Mode.FILTER);
    assertTrue(ve instanceof FilterLongColumnInList);
    ve = vc.getVectorExpression(exprDesc, VectorExpressionDescriptor.Mode.PROJECTION);
    assertTrue(ve instanceof LongColumnInList);

    // double IN
    children1.set(0, new ExprNodeColumnDesc(Double.class, "col1", "table", false));
    children1.set(1, new ExprNodeConstantDesc(10d));
    children1.set(2, new ExprNodeConstantDesc(20d));
    ve = vc.getVectorExpression(exprDesc, VectorExpressionDescriptor.Mode.FILTER);
    assertTrue(ve instanceof FilterDoubleColumnInList);
    ve = vc.getVectorExpression(exprDesc, VectorExpressionDescriptor.Mode.PROJECTION);
    assertTrue(ve instanceof DoubleColumnInList);
  }
Create original expression tree for following
(plus (minus (plus col1 col2) col3) (multiply col4 (mod col5 col6)) )
ql/src/test/org/apache/hadoop/hive/ql/exec/vector/TestVectorizationContext.java