@Test
  public void testDecimalColModuloDecimalScalar() throws HiveException {
    VectorizedRowBatch b = getVectorizedRowBatch3DecimalCols();
    HiveDecimal d = HiveDecimal.create("2.00");
    VectorExpression expr = new DecimalColModuloDecimalScalar(0, d, 2);

    // test without nulls
    expr.evaluate(b);
    DecimalColumnVector r = (DecimalColumnVector) b.cols[2];
    assertTrue(r.vector[0].getHiveDecimal().equals(HiveDecimal.create("1.20")));
    assertTrue(r.vector[1].getHiveDecimal().equals(HiveDecimal.create("-1.30")));
    assertTrue(r.vector[2].getHiveDecimal().equals(HiveDecimal.create("0")));

    // try again with some different data values and divisor
    DecimalColumnVector in = (DecimalColumnVector) b.cols[0];
    in.vector[0].set(HiveDecimal.create("15.40"));
    in.vector[1].set(HiveDecimal.create("-17.20"));
    in.vector[2].set(HiveDecimal.create("70.00"));
    d = HiveDecimal.create("4.75");
    expr = new DecimalColModuloDecimalScalar(0, d, 2);

    expr.evaluate(b);
    assertTrue(r.vector[0].getHiveDecimal().equals(HiveDecimal.create("1.15")));
    assertTrue(r.vector[1].getHiveDecimal().equals(HiveDecimal.create("-2.95")));
    assertTrue(r.vector[2].getHiveDecimal().equals(HiveDecimal.create("3.50")));

    // try a zero-divide to show a repeating NULL is produced
    d = HiveDecimal.create("0.00");
    expr = new DecimalColModuloDecimalScalar(0, d, 2);
    expr.evaluate(b);
    assertFalse(r.noNulls);
    assertTrue(r.isNull[0]);
    assertTrue(r.isRepeating);
  }
Unit tests for vectorized arithmetic expressions.
ql/src/test/org/apache/hadoop/hive/ql/exec/vector/expressions/TestVectorArithmeticExpressions.java