This will help you
http://kylin.apache.org/docs/howto/howto_optimize_cubes.html
The idea is always, How I can reduce the number of Dimension ?
If you reduce Dim, the time / resources to build the cube and final size of
it decrease --> Its good
An example can be DIM_Persons: Id_Person , Name, Surname, Address, .....
Id_Person can be HostColumn
and other columns can be calculated from ID --> are Extended Column
2016-11-30 11:35 GMT+01:00 仇同心 <[email protected]>:
> Hi ,all
> I don’t understand the usage scenarios of EXTENDED_COLUMN,although I saw
> this article “https://issues.apache.org/jira/browse/KYLIN-1313”.
> What,s the means about parameters of “Host Column” and “Extended Column”?
> Why use this expression,and what aspects of optimization that this
> expression solved?
> Can be combined with a SQL statement to explain?
>
>
> Thanks~
>
