什么是“反向术”和“ MergetReereRevers”在Clickhouse中的意思是解释管道？

Question

Clickhouse解释管道中的“反向驱动器”和“ MergetReereRevers”是什么意思？

表

CREATE TABLE device_info
(
`event_time` DateTime,
`create_time` DateTime DEFAULT now(),
`product_id` String,
`platform` String,
`app_version` String,
`sdk_version` String,
`os_version` Strin,
`model` String,
`device_id` String,
`device_type` String,
`device_cost` Int64,
`data_id` String
)
ENGINE = ReplicatedMergeTree()
PARTITION BY toYYYYMMDD(event_time)
ORDER BY (event_time, product_id, platform, app_version, sdk_version, os_version, model)
TTL event_time + toIntervalDay(7)
SETTINGS index_granularity = 8192 

SELECT
   event_time AS eventTime,
   launch_cost AS launchCost,
   device_id,
   data_id
FROM device_info
WHERE (device_id = 'xxxxxxx') AND (product_id = 'xxxxxxx') AND (device_type IN ('type1')) AND (event_time >= 'xxxx') AND (event_time <= 'xxxxx')
ORDER BY event_time DESC

解释管道中的

“反向术”和“ MergetReereReversevers”的意思是解释管道中的意思？

解释管道

在跟踪日志中，我发现语句是 “ MergingSortedTransform：合并分类645个块，861行5.927999977 sec。陈述是什么意思？

感谢您的回答！THX