Hi, I've just think you can achive same result with query without groupBy. Select distinct age from ..
Does it workable for you? 10 мая 2017 г. 17:56 пользователь "Guillermo Ortiz" <konstt2...@gmail.com> написал: > It's my laptop. 16gb, i7.. The collection size it's 5Mill objects (1,2GB) > and it takes about 30sec. > I have tried to execute the query with the same collection with and > without indices with the same time results. > > This is a test before to run in the real cluster with 6 nodes of 512Gb and > 48cores each one. We tried to execute there with a real dataset(22M rows, > 7gb) but it takes so long that query is aborted. > > > 2017-05-08 12:12 GMT+02:00 Andrey Mashenkov <andrey.mashen...@gmail.com>: > >> Hi, >> >> Why do you think query is slow? >> What its execution time? What is expected time? >> How many nodes do you use? How much data does cache contains? >> >> On Mon, May 8, 2017 at 1:47 AM, Guillermo Ortiz <konstt2...@gmail.com> >> wrote: >> >>> I have a simple cache where I have Person object (id, age and so on..) >>> >>> I have created indeces by id and age to try some examples but queries >>> with "group by" go really slow. >>> >>> I'm trying this query: >>> SELECT age >>> FROM >>> PersonWithindex >>> group by age >>> >>> >>> SELECT >>> AGE AS __C0 >>> FROM "personCacheWithIndex".PERSONWITHINDEX >>> /* "personCacheWithIndex"."age_idx" */ >>> GROUP BY AGE >>> /* group sorted */ >>> >>> SELECT >>> __C0 AS AGE >>> FROM PUBLIC.__T0 >>> /* "personCacheWithIndex"."merge_scan" */ >>> GROUP BY __C0 >>> >>> Although it seems that it uses index, why is it going so slow? I think >>> that it should be pretty fast with an index. >>> >> >> >> >> -- >> Best regards, >> Andrey V. Mashenkov >> > >
