And this link( https://www.slideshare.net/YangLi43/design-cube-in-apache-kylin) that Shaofeng previous shared is also very helpful, see this chapter: "The Order of Dimensions"
-- Regards! Aron Tao Xiaoxiang Yu <xiaoxiang...@kyligence.io> 于2019年6月11日周二 上午2:45写道： > Hi, wangfx > > Kylin converts sql query to two parameters(Start_key and end_key) in the > range Scan operation in HBase. > The well-designed Rowkey will more effectively complete the query > filtering and positioning of the data, reduce the number of IO, improve the > query speed, the order of the dimension in the Rowkey, and have a > significant impact on the query performance. > > The following 2 principles need to be combined when adjusting the order of > Rowkey: · > 1. Dimensions that are used as filter criteria in a query are placed in > front of the non-filtered conditional dimension · > 2. Dimensions with a higher cardinality, before the lower cardinality > dimension. > > So, in your situation, I suggest the order should be :a,b,c,d.(If you have > only four dimensions). > > And this link may help, > https://kyligence.io/zh/blog/apache-kylin-optimizer-kybot-rowkey/. > > > ---------------- > Best wishes, > Xiaoxiang Yu > > > 在 2019/6/11 09:56，“wangfx”<945517...@qq.com> 写入: > > > cube若干个维度，其中a，b为强制维度，一定出现在where里，b的基数很低(只有3种数据)；c，d不会出现在where里，只出现在select和group > by里，基数c>d>a>b，剩下的维度是where里的常规维度，请问rowkey里abcd和其他的维度顺序怎么排？ > >
