wangpeng_none
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Member since ‎2013 May 17

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SAP Hana Dictionary Encoding(字典编码)

2013 May 31
字典编码，列被分成了字典列和属性向量。加快了，数据检索。列存储易于列操作（比如统计性别人数），行存储易于记录查询操作（比如，查询姓名后，查性别，年龄，住址能）