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在SpreadJS中，WorkSheet 采取了稀疏矩阵的方式，只对有内容的单元格开辟存储空间。
这种Cell base的存储不仅节省存储空间也有利于数据检索，单元格的移动，以及数据的撤销和回滚。
在数据管理分析的场景下，从服务端获取到常常的是json数组，这样密集的数据并不是稀疏矩阵适合的场景。
集算表采取了另一种存储策略，Column Base,列式存储
与列式存储对应的就是行式存储,前面的json数据对应到表格里就是左边图的样子 集算表的dataManager在获取到Table数据后，并不是按照传输来的数据格式直接存储。 而会转换为右图以列为单位的数组来存储。
这里可以看到数据的存储结构,每一列都是一个数组.数组中只是数据,没有冗余的属性信息
列式存储的优势：
作者: Grapecity.China | 审核：Clark.Pan | 更新时间：2023.12.28