Is there a way to left join on column which is an Array - clickhouse

Question

I'm wondering if it's possible to make a left join on Array column, I know there is arrayJoin but I'm not sure if it suits my case.
I did try a query like this:
SELECT
foo.name AS name, -- String
foo.policies AS policies -- Array(String),
groupArray(profits7d.profits) AS profits7D
FROM (
...
) AS foo
any left join (
SELECT
groupArray((x, y)) as profits,
policy -- String
FROM (
SELECT
day as x,
SUM(profit) as y,
policy
FROM profits
WHERE x >= toDateTime(NOW() - INTERVAL '1 week')
GROUP BY x, policy
)
GROUP BY policy
) AS profits7d ON has(foo.policies, profits7d.policy)
I expect this:
┌─name─┬─policies──────┬─profits7D────────────┐
│ test │ ['one','two'] │ [(200,'2023-01-01')] │
└──────┴───────────────┴──────────────────────┘
I have a INVALID_JOIN_ON_EXPRESSION error, so I'm asking what I need to use to have this query to work, I can't find what expression works for ON
Thanks in advance
Cheers

Answer 1

Without arrayJoin
create table L (polices Array(String), f String) Engine=Memory as select ['a', 'b'], 'x';
create table R (policy String, f String) Engine=Memory as select * from values (('a', 'y'), ('b', 'y1'));
SELECT *
FROM L
ANY LEFT JOIN R ON
((L.polices[1]) = R.policy)
OR ((L.polices[2]) = R.policy)
OR ((L.polices[3]) = R.policy)
OR ((L.polices[4]) = R.policy)
┌─polices───┬─f─┬─policy─┬─R.f─┐
│ ['a','b'] │ x │ a │ y │
└───────────┴───┴────────┴─────┘
With arrayJoin
SELECT
L.polices,
(any((L.f, R.*)) AS t).1 AS f,
t.2 AS policy,
t.3 AS f1
FROM
(
SELECT
arrayJoin(L.polices) AS _policy,
polices,
f
FROM L
) AS L
ANY LEFT JOIN R ON _policy = R.policy
GROUP BY L.polices
┌─polices───┬─f─┬─policy─┬─f1─┐
│ ['a','b'] │ x │ a │ y │
└───────────┴───┴────────┴────┘