USE tpch1;
CREATE AGGREGATE FUNCTION IF NOT EXISTS avg_mode returns REAL soname 'libudf_mysql.so';
drop table if exists t1;
create table t1 (c1 int, c2 int, c3 int, c4 int)engine=columnstore;
insert into t1 values (1,2,3,4),(1,2,3,4),(1,2,3,4),(1,2,3,4);
select  c1,count(distinct c2) as c2,count(distinct c3) as c3, avg_mode(c4) as c4 from t1 group by c1;
c1	c2	c3	c4
1	1	1	4
drop table if exists t1;