That doesn't happen. One driver is picked to run the query. The drivers bid by providing their estimate of cost for running this query.
On Thu, Aug 25, 2016 at 1:47 AM Tao Yan <t...@linkedin.com> wrote: > If the query is executed in multiple drivers, and more than one drivers > return the result, then, how does Lens decide which result to return to > user? And if one driver return result before others, will Lens wait for > other drivers? > > Thanks, > > On Wed, Aug 24, 2016 at 12:00 AM, Rajat Khandelwal <rajatgupt...@gmail.com > > wrote: > >> Yes, it can be any standard sql. The logic in lens is to check the from >> clause, and if the entity in the from-clause is either a cube or a >> dimension, then treat it as cube query, and do the translation before >> running this query. If it's not a cube or a dimension, it's treated as a >> native query and all the drivers are forwarded this query as it is without >> any translation. >> >> >> On Wed, Aug 24, 2016 at 5:43 AM Tao Yan <t...@linkedin.com> wrote: >> >>> When using "select" (not "cube select"), can it be any standard SQL (not >>> bounded to Lens QL)? >>> >>> Thanks! >>> >>> On Tue, Aug 23, 2016 at 4:57 PM, amareshwarisr . <amareshw...@gmail.com> >>> wrote: >>> >>>> cube select expects the from clause to be on cube/dimension. select is >>>> the one in SQL. >>>> >>>> Going forward from 2.6 onwards, cube keyword is optional for >>>> cube/dimension queries. >>>> >>>> Thanks >>>> >>>> On Wed, Aug 24, 2016 at 3:53 AM, Tao Yan <t...@linkedin.com> wrote: >>>> >>>>> Hi Lens Developer, >>>>> >>>>> I found the following example in >>>>> https://github.com/apache/lens/blob/master/lens-examples/src/main/resources/dimension-queries.sql >>>>> >>>>> select * from (cube select sample_dim.name name1, sample_dim2_chain. >>>>> name name2 from sample_dim where sample_dim.name !='first') a >>>>> >>>>> I tested "cube select * " and it didn't work, and the above example >>>>> shows "select *". What is the difference between "select" and "cube >>>>> select"? >>>>> >>>>> Thanks, >>>>> -- >>>>> >>>>> *Tao Yan* >>>>> Software Engineer >>>>> Data Analytics Infrastructure Tools and Services >>>>> >>>>> >>>>> >>>>> 206.250.5345 >>>>> t...@linkedin.com >>>>> https://www.linkedin.com/in/taousc >>>>> >>>> >>>> >>> >>> >>> -- >>> >>> *Tao Yan* >>> Software Engineer >>> Data Analytics Infrastructure Tools and Services >>> >>> >>> >>> 206.250.5345 >>> t...@linkedin.com >>> https://www.linkedin.com/in/taousc >>> >> > > > -- > > *Tao Yan* > Software Engineer > Data Analytics Infrastructure Tools and Services > > > > 206.250.5345 > t...@linkedin.com > https://www.linkedin.com/in/taousc >
