agg_state is agg intermediate state, detail see
state combinator: https://doris.apache.org/zh-CN/docs/dev/sql-manual/sql-functions/combinators/state
this support agg function roll up as following
+---------------------+---------------------------------------------+---------------------+
| query | materialized view | roll up |
| ------------------- | ------------------------------------------- | ------------------- |
| agg_funtion() | agg_funtion_unoin() or agg_funtion_state() | agg_funtion_merge() |
| agg_funtion_unoin() | agg_funtion_unoin() or agg_funtion_state() | agg_funtion_union() |
| agg_funtion_merge() | agg_funtion_unoin() or agg_funtion_state() | agg_funtion_merge() |
+---------------------+---------------------------------------------+---------------------+
for example which can be rewritten by mv sucessfully as following
MV defination is
```
select
o_orderstatus,
l_partkey,
l_suppkey,
sum_union(sum_state(o_shippriority)),
group_concat_union(group_concat_state(l_shipinstruct)),
avg_union(avg_state(l_linenumber)),
max_by_union(max_by_state(l_shipmode, l_suppkey)),
count_union(count_state(l_orderkey)),
multi_distinct_count_union(multi_distinct_count_state(l_shipmode))
from lineitem
left join orders
on lineitem.l_orderkey = o_orderkey and l_shipdate = o_orderdate
group by
o_orderstatus,
l_partkey,
l_suppkey;
```
Query is
```
select
o_orderstatus,
l_suppkey,
sum(o_shippriority),
group_concat(l_shipinstruct),
avg(l_linenumber),
max_by(l_shipmode,l_suppkey),
count(l_orderkey),
multi_distinct_count(l_shipmode)
from lineitem
left join orders
on l_orderkey = o_orderkey and l_shipdate = o_orderdate
group by
o_orderstatus,
l_suppkey;
```
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