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
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