DB::Exception：可刷新的物化视图是实验性的。启用allow_experimental_refreshable_materialized_view来使用

Question

想要在 clickhouse DB 上创建物化视图，下面是我的 sqlQuery :

CREATE MATERIALIZED VIEW IF NOT EXISTS tutorial.AL_DEMAND_views02
REFRESH EVERY 1 MINUTE
ENGINE = ReplacingMergeTree()
ORDER BY "Month"
POPULATE
AS
SELECT
    "Month",
    SUM("Values") AS "Values"
FROM
   (SELECT * FROM (select * from tutorial.AL_DEMAND))
GROUP BY
    "Month";

Error I got :
SQL Error [344] [07000]: Code: 344. DB::Exception: Refreshable materialized views are experimental. Enable allow_experimental_refreshable_materialized_view to use. (SUPPORT_IS_DISABLED) (version 23.12.3.40 (official build))
, server ClickHouseNode [uri=http://XX.XX.X.XX:8123/default, options={use_server_time_zone=false,use_time_zone=false}]@-543127256

从 DBEaver 我能够创建视图，因为我可以一次运行 2 个查询，下面是正在创建视图的查询。

SET allow_experimental_refreshable_materialized_view = 1;
CREATE MATERIALIZED VIEW IF NOT EXISTS tutorial.AL_DEMAND_views02
REFRESH EVERY 1 MINUTE
ENGINE = ReplacingMergeTree()
ORDER BY "Month"
POPULATE
AS
SELECT
    "Month",
    SUM("Values") AS "Values"
FROM
   (SELECT * FROM (select * from tutorial.AL_DEMAND))
GROUP BY
    "Month";

从 Java 代码中，如何创建物化视图

Answer 1

您可以使用用户配置文件或使用

set

命令启用此设置，但对于设置命令，您需要使用连接字符串中的 session_id 设置启用持久会话。

无论如何，最简单的方法是使用默认配置文件：

# cat /etc/clickhouse-server/users.d/allow_experimental_refreshable_materialized_view.xml

<?xml version="1.0" ?>
<clickhouse>
    <profiles>
        <default>
            <allow_experimental_refreshable_materialized_view>1</allow_experimental_refreshable_materialized_view>
        </default>
    </profiles>
</clickhouse>

session_id：https://github.com/ClickHouse/clickhouse-java/issues/1017