please ignore the email. my mistake, the mail is not finished. I will sent a new mail later
At 2017-03-28 13:24:34, "马云" <simafengyun1...@163.com> wrote: >Hi Dev, > > >currently I have done an optimization for order by 1 dimension. >performance test as below > > >my optimization solution for order by 1 dimension as below >mainly leverage the dimension's order stored feature in each blocklet >step1. change logical plan and push down the order by and limit information to >carbon scan > and change sort physical plan to TakeOrderedAndProject since data > will be get and sorted in each partition >step2. apply the limit number, blocklet's min_max index to filter blocklet. > So it can reduce some scan time if some blocklets was filtered > > >step3. in each partition，load the order by dimension data for all blocklet >which is filter > > >
