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       
(Showing Draft Content)

性能

问题:SpreadJS的集算表为何能保证高性能?


概念:

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。

152506y257pipwae0ih0hq


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。

152625abveizdn7ibbtdib


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。

152704rsvo1gmvxo8xpok8


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

152746dqbb4cn4qdnqcyqo


列式存储的优势:

152806ct3wszsys1wrorqy

作者: Grapecity.China | 审核:Clark.Pan | 更新时间:2023.12.28