@Test
  public void testAvgDecimal() throws HiveException {
    testAggregateDecimal(
        "Decimal",
        "avg",
        2,
        Arrays.asList(new Object[]{
                HiveDecimal.create(1),
                HiveDecimal.create(2),
                HiveDecimal.create(3)}),
       HiveDecimal.create((1+2+3)/3));
  }
Unit test for the vectorized GROUP BY operator.
ql/src/test/org/apache/hadoop/hive/ql/exec/vector/TestVectorGroupByOperator.java