public static SqlAggregation from(QueryDataType operandType, boolean distinct) {
        SqlAggregation aggregation = from(operandType);
        return distinct ? new DistinctSqlAggregation(aggregation) : aggregation;
    }
@Test
    @Parameters(method = "types")
    public void test_default(QueryDataType operandType) {
        SqlAggregation aggregation = AvgSqlAggregations.from(operandType, false);

        assertThat(aggregation.collect()).isNull();
    }