Postgresql array unique aggregation - postgresql

Question

I have a large table with structure
CREATE TABLE t (
id SERIAL primary key ,
a_list int[] not null,
b_list int[] not null,
c_list int[] not null,
d_list int[] not null,
type int not null
)
I want query all unique values from a_list, b_list, c_list, d_list for type like this
select
some_array_unique_agg_function(a_list),
some_array_unique_agg_function(b_list),
some_array_unique_agg_function(c_list),
some_array_unique_agg_function(d_list),
count(1)
where type = 30
For example, for this data
+----+---------+--------+--------+---------+------+
| id | a_list | b_list | c_list | d_list | type |
+----+---------+--------+--------+---------+------+
| 1 | {1,3,4} | {2,4} | {1,1} | {2,4,5} | 30 |
| 1 | {1,2,4} | {2,4} | {4,1} | {2,4,5} | 30 |
| 1 | {1,3,5} | {2} | {} | {2,4,5} | 30 |
+----+---------+--------+--------+---------+------+
I want the next result
+-------------+--------+--------+-----------+-------+
| a_list | b_list | c_list | d_list | count |
+-------------+--------+--------+-----------+-------+
| {1,2,3,4,5} | {2,4} | {1,4} | {2,4,5} | 3 |
+-------------+--------+--------+-----------+-------+
Is there some_array_unique_agg_function for my purposes?

Answer 1

Try this
with cte as (select
unnest( a_list::text[] )::integer as a_list,
unnest( b_list::text[] )::integer as b_list,
unnest( c_list::text[] )::integer as c_list,
unnest( d_list::text[] )::integer as d_list,
(select count(type) from t) as type
from t
where type = 30
)
select array_agg(distinct a_list),array_agg(distinct b_list)
,array_agg(distinct c_list),array_agg(distinct d_list),type from cte group by type ;
Result:
"{1,2,3,4,5}";"{2,4,NULL}";"{1,4,NULL}";"{2,4,5}";3