It's just the "approx_count_distinct" aggregate function.
On Tue, Nov 22, 2016 at 6:51 PM, Xinyu Zhang <wsz...@163.com> wrote: > Could you please tell me how to use the approximate count distinct? Is > there any docs? > > Thanks > > > At 2016-11-21 15:56:21, "Reynold Xin" <r...@databricks.com> wrote: > > Can you use the approximate count distinct? > > > On Sun, Nov 20, 2016 at 11:51 PM, Xinyu Zhang <wsz...@163.com> wrote: > >> >> MapWithState is also very useful. >> I want to calculate UV in real time, but "distinct count" and "multiple >> streaming aggregations" are not supported. >> Is there any method to calculate real-time UV in the current version? >> >> >> >> At 2016-11-19 06:01:45, "Michael Armbrust" <mich...@databricks.com> >> wrote: >> >> Doing this generally is pretty hard. We will likely support algebraic >> aggregate eventually, but this is not currently slotted for 2.2. Instead I >> think we will add something like mapWithState that lets users compute >> arbitrary stateful things. What is your use case? >> >> >> On Wed, Nov 16, 2016 at 6:58 PM, wszxyh <wsz...@163.com> wrote: >> >>> Hi >>> >>> Multiple streaming aggregations are not yet supported. When will it be >>> supported? Is it in the plan? >>> >>> Thanks >>> >>> >>> >>> >> >> >> >> >> > > > > >
