增量刷新不可用。
其思想是，使用staging表增量式地刷新MQT，而不是从头开始重新生成MQT。
The idea is to use the staging table to incrementally refresh the MQT, rather than regenerate the MQT from scratch.
其思想是，使用staging表增量式地刷新MQT，而不是从头开始重新生成MQT。
The idea is to use the staging table to incrementally refresh the MQT, rather than regenerate the MQT from scratch.
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