ClickHouse: Cannot cancel queries when scalar subqueries are being calculated

!!! UPD: if you face that issue - please post the sample of the query in comments after checking if reproduces !!!

Some queries can’t be killed - nor with replace query, nor with kill query.

Sample:

SELECT version()

┌─version()─┐
│ 1.1.54304 │
└───────────┘

1 rows in set. Elapsed: 0.001 sec. 

:) select (SELECT max(number) from system.numbers) + 1;

SELECT 
    (
        SELECT max(number)
        FROM system.numbers 
    ) + 1

^CCancelling query.
^C

> clickhouse-client -m
ClickHouse client version 1.1.54304.
Connecting to localhost:9000.
Connected to ClickHouse server version 1.1.54304.

:) show processlist;

SHOW PROCESSLIST

┌─is_initial_query─┬─user────┬─query_id─────────────────────────────┬─address─┬──port─┬─initial_user─┬─initial_query_id─────────────────────┬─initial_address─┬─initial_port─┬─interface─┬─os_user─┬─client_hostname─┬─client_name───────┬─client_version_major─┬─client_version_minor─┬─client_revision─┬─http_method─┬─http_user_agent─┬─quota_key─┬──────elapsed─┬─read_rows─┬─read_bytes─┬─total_rows_approx─┬─written_rows─┬─written_bytes─┬─memory_usage─┬─query───────────────────────────────────────────────┐
│                1 │ default │ 400f52a9-fa09-42ba-856a-aeb442f56b79 │ ::1     │ 47312 │ default      │ 400f52a9-fa09-42ba-856a-aeb442f56b79 │ ::1             │        47312 │         1 │ name    │ host            │ ClickHouse client │                    1 │                    1 │           54304 │           0 │                 │           │ 18.055088508 │         0 │          0 │                 0 │            0 │             0 │      1052672 │ select (SELECT max(number) from system.numbers) + 1 │
└──────────────────┴─────────┴──────────────────────────────────────┴─────────┴───────┴──────────────┴──────────────────────────────────────┴─────────────────┴──────────────┴───────────┴─────────┴─────────────────┴───────────────────┴──────────────────────┴──────────────────────┴─────────────────┴─────────────┴─────────────────┴───────────┴──────────────┴───────────┴────────────┴───────────────────┴──────────────┴───────────────┴──────────────┴─────────────────────────────────────────────────────┘

(only server restart helps) Also max_execution_time is able to kill that query by timeout.