"IN" support for joins - pentaho

Question

We're trying to connect Pentaho BI to ClickHouse and sometimes Pentaho generates queries as such:
select
...
from
date_dimension_table,
fact_table,
other_dimension_table
where
fact_table.fact_date = date_dimension_table.date
and date_dimension_table.calendar_year = 2019
and date_dimension_table.month_name in ('April', 'June', ...)
and fact_table.other_dimension_id = other_dimension_table.id
and other_dimension_table.code in ('code1', 'code2', ...)
group by
date_dimension_table.calendar_year,
date_dimension_table.month_name,
other_dimension_table.code;
It produces ClickHouse error: Code: 403, e.displayText() = DB::Exception: Invalid expression for JOIN ON. Expected equals expression, got (code AS c2) IN ('code1', 'code2', ...). Supported syntax: JOIN ON Expr([table.]column, ...) = Expr([table.]column, ...) [AND Expr([table.]column, ...) = Expr([table.]column, ...)...] (version 19.15.3.6 (official build))
Engines used for tables: fact_table - MergeTree, both dimensions - TinyLog.
Thus, questions:
Can this problem be solved by changing table engines? Unfortunately, we can't change query, it's autogenerated.
If not, are there any plans for supporting joins with in clause in ClickHouse in the nearest future?
Thanx.

Answer 1

This issue has been fixed beginning with ClickHouse release v20.3.2.1, 2020-03-12 (see Issue 7314), so you need to upgrade CH.
! Don't forget to check all backward-incompatible changes (see changelog).
Let's reproduce this problem on CH 19.15.3 revision 54426 to get the error you described:
Received exception from server (version 19.15.3):
Code: 403. DB::Exception: Received from localhost:9000. DB::Exception: Invalid expression for JOIN ON. Expected equals expression, got code IN ('code1', 'code2'). Supported syntax: JOIN ON Expr([table.]column, ...) = Expr([table.]column, ...) [AND Expr([table.]column, ...) = Expr([table.]column, ...) ...].
Now execute this query on the latest version of CH (20.3.7 revision 54433) to make sure that it works correctly:
docker pull yandex/clickhouse-server:latest
docker run -d --name ch_test_latest yandex/clickhouse-server:latest
docker exec -it ch_test_latest clickhouse-client
# create tables as described below
..
# execute test query
..
Test preparation:
create table date_dimension_table (
date DateTime,
calendar_year Int32,
month_name String
) Engine = Memory;
create table fact_table (
fact_date DateTime,
other_dimension_id Int32
) Engine = Memory;
create table other_dimension_table (
id Int32,
code String
) Engine = Memory;
Test query:
SELECT
date_dimension_table.calendar_year,
date_dimension_table.month_name,
other_dimension_table.code
FROM date_dimension_table
,fact_table
,other_dimension_table
WHERE (fact_table.fact_date = date_dimension_table.date)
AND (date_dimension_table.calendar_year = 2019)
AND (date_dimension_table.month_name IN ('April', 'June'))
AND (fact_table.other_dimension_id = other_dimension_table.id)
AND (other_dimension_table.code IN ('code1', 'code2'))
GROUP BY
date_dimension_table.calendar_year,
date_dimension_table.month_name,
other_dimension_table.code