clickhouse附加物化视图错误

Question

鉴于这个 dockerfile

FROM yandex/clickhouse-server:20.6.4.44
COPY default /var/lib/clickhouse/metadata/default

并将这些 sql 文件放在 default 目录中：

ATTACH TABLE IF NOT EXISTS default.a_table (
    `startTimestamp` DateTime,
    `fieldNumber` UInt32,
    `clientCountry` UInt16,
    `packets` UInt64,
    `bytes` UInt64
)
ENGINE = MergeTree()
PARTITION BY toYYYYMM(startTimestamp)
ORDER BY (startTimestamp, clientCountry)
SETTINGS index_granularity = 8192

ATTACH TABLE IF NOT EXISTS default.net_by_country_15m (
    `startTimestamp` DateTime,
    `clientCountry` UInt16,
    `bytes` UInt64
)
ENGINE = SummingMergeTree()
PARTITION BY toYYYYMM(startTimestamp)
ORDER BY (startTimestamp, clientCountry)
SETTINGS index_granularity = 8192;

还有这个观点：

ATTACH MATERIALIZED VIEW v_by_country_15m TO default.net_by_country_15m
AS (
       SELECT startTimestamp,
              clientCountry,
              sum(bytes) as bytes
       FROM default.a_table
       GROUP BY startTimestamp, clientCountry
)

容器没有启动并手动运行我得到的语句

Received from localhost:9000. DB::Exception: Table `v_by_country_15m` doesn't exist.

（这是clickhouse: create materialized view on startup (docker) 的后续行动，但我不想使用docker-entrypoint-initdb.d 目录，而是想继续使用metadata 目录，因为这是我继承的一个项目，并且不想改变太多，直到我更好地了解 Clickhouse）。

（更新的表定义）

Answer 1

应该是TO default.a_table

ATTACH MATERIALIZED VIEW v_by_country_15m  to default.a_table
AS (
       SELECT startTimestamp,
              clientCountry,
              sum(bytes) as bytes
       FROM another_table
       GROUP BY startTimestamp, clientCountry
)