Hi, Yuzhang: I would appreciate if you can provide answer to my 2 questions.
Thanks. Kang-sen From: Lu, Kang-Sen <[email protected]> Sent: Friday, March 15, 2019 8:15 AM To: [email protected] Subject: RE: question related to the aggregation groups configuration ________________________________ NOTICE: This email was received from an EXTERNAL sender ________________________________ Hi, Yuzhang: Thanks for taking time to reply. I actually have read that article several times earlier before. However, may be I missed some details or what, I am not clear about how those rules actual work and how they interfere with each other. From the article you pointed out, the hierarchy rule does have an example, so it is less likely to be confused. I did not find any discussion about the “mandatory rule”. It is supposed to be very simple, but I am stuck by the details. Let’s say, “includes” is a set of dim: { d1, d2, … d10}, and the “mandatory” is a set of dim: {D1, …, D9}. So it is obvious that each cuboid generated from this agg group should all include set of dim {D1, …, D9}. Now, D10 could be either selected or not. So the natural guess is that this agg group will generate two cuboids, i.e {D1,…,D9} and {D1,… D10}. Is this what kylin will do? Another detail I am not clear is the interaction of “joint rule” and the “mandatory rule”. It seems that there is an interaction between these two rules. I am not clear why, and it is not discussed in the article you mentioned. That was my two original questions. Thanks again. Kang-sen From: yuzhang <[email protected]<mailto:[email protected]>> Sent: Friday, March 15, 2019 7:46 AM To: [email protected]<mailto:[email protected]> Subject: Re: question related to the aggregation groups configuration ________________________________ NOTICE: This email was received from an EXTERNAL sender ________________________________ Hi kang-sen: Here is a blog about the mind of aggregation group. I hope it will help you. https://kylin.apache.org/blog/2016/02/18/new-aggregation-group/<https://kylin.apache.org/blog/2016/02/18/new-aggregation-group/> Best regards yuzhang [Image removed by sender.] yuzhang [email protected]<mailto:[email protected]> 签名由 网易邮箱大师<https://mail.163.com/dashi/dlpro.html?from=mail81> 定制 On 3/14/2019 21:21，Lu, Kang-Sen<[email protected]><mailto:[email protected]> wrote： I am running kylin 2.5.1 I have two questions related to the aggregation group configuration. In the kylin GUI, select “Model”, then try to edit a cube design, under “Grid”, select “Advanced Setting”, we can enter multiple “Aggregation Groups”. Each “Aggregation Group” can specify zero, one, or many cuboids, with the combination of dimensions. Q1: If I want one and only one cuboid to be created with dimensions set = {D1, D2, … , D10}, then is it correct to enter D1-to-D10 in the “includes” list, and “D1-to-D9 in the “Mandatory Dimensions” list? The key question is “will kylin generate two cuboids, i.e. {D1, …, D9} and {D1, … , D10} or just one cuboid”? Q2: If I entered D1-to-D10 into the “includes” list, and entered {D1, D2} in the “Joint Dimensions” list, then I can’t enter either D1 or D2 into the “Mandatory Dimensions” list? I was thinking if I entered {D1, D3, … , D9} in the “Mandatory Dimensions”, and with {D1, D2} in the “Joint Dimensions”, then there should only one cuboid generated for {D1, D2, …, D10}. Why is it not allowed? Maybe the doc have this information described. But it is not clear to me exactly how does kylin process the info entered in the “includes”, “Mandatory Dimensions”, and “Joint Dimensions”. Can someone either point me to some document or answer the questions I mentioned above. Thanks. Kang-sen ________________________________ Notice: This e-mail together with any attachments may contain information of Ribbon Communications Inc. that is confidential and/or proprietary for the sole use of the intended recipient. Any review, disclosure, reliance or distribution by others or forwarding without express permission is strictly prohibited. If you are not the intended recipient, please notify the sender immediately and then delete all copies, including any attachments. ________________________________
