Refer to:http://kylin.apache.org/blog/2016/02/18/new-aggregation-group/
Joint rules. This is a newly introduced rule. If two or more dimensions are “joint”, then any valid cuboid will either contain none of these dimensions, or contain them all. In other words, these dimensions will always be “together”. This is useful when the cube designer is sure some of the dimensions will always be queried together. It is also a nuclear weapon for combination pruning on less-likely-to-use dimensions. Suppose you have 20 dimensions, the first 10 dimensions are frequently used and the latter 10 are less likely to be used. By joining the latter 10 dimensions as “joint”, you’re effectively reducing cuboid numbers from 2^20 to 2^11. Actually this is pretty much what the old “aggregation group” mechanism was for. Thanks, Dong Original Message Sender:耳东[email protected] Recipient:[email protected] Date:Friday, May 6, 2016 17:51 Subject:Joint Dimension hi all： In the step Advanced Setting, What does the Joint Dimension mean?
