When distribution statistics are generated for the column "TYPE," the optimizer knows the real frequency of each model.
而一旦生成了关于“TYPE”列的分布统计信息,优化器即可了解每种型号真正的出现频率。
Additionally, the length information of the column is not information that is normally captured in an analysis model.
另外,很少能从分析模型中得到列的长度信息。
To meet the needs of a coarse-grained component model, all the items in the fine-grained column should be considered optional parts of the SCA component model.
要满足粗粒度组件模型的需求,细粒度列中的所有项目都必需视为SCA组件模型的一部分。
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