HiveDecimal d = HiveDecimal.create(1);
VectorExpression expr = new DecimalColSubtractDecimalScalar(0, d, 2);
// test without nulls
expr.evaluate(b);
DecimalColumnVector r = (DecimalColumnVector) b.cols[2];
assertTrue(r.vector[0].getHiveDecimal().equals(HiveDecimal.create("0.20")));
assertTrue(r.vector[1].getHiveDecimal().equals(HiveDecimal.create("-4.30")));
assertTrue(r.vector[2].getHiveDecimal().equals(HiveDecimal.create("-1")));
// test that underflow produces null
b = getVectorizedRowBatch3DecimalCols();
DecimalColumnVector in = (DecimalColumnVector) b.cols[0];
in.vector[0].set(HiveDecimal.create("-9999999999999999.99")); // set to min possible value
expr.evaluate(b);
r = (DecimalColumnVector) b.cols[2];
assertFalse(r.noNulls);
assertTrue(r.isNull[0]);