mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-14 11:33:46 +00:00
25 lines
1.7 KiB
SQL
25 lines
1.7 KiB
SQL
select '-- check that distinct with and w/o optimization produce the same result';
|
|
|
|
drop table if exists distinct_in_order sync;
|
|
drop table if exists ordinary_distinct sync;
|
|
|
|
select '-- DISTINCT colums are the same as in ORDER BY';
|
|
create table distinct_in_order (CounterID UInt32, EventDate Date) engine=MergeTree() order by (CounterID, EventDate);
|
|
insert into distinct_in_order select distinct CounterID, EventDate from test.hits order by CounterID, EventDate settings optimize_distinct_in_order=1;
|
|
create table ordinary_distinct (CounterID UInt32, EventDate Date) engine=MergeTree() order by (CounterID, EventDate);
|
|
insert into ordinary_distinct select distinct CounterID, EventDate from test.hits order by CounterID, EventDate settings optimize_distinct_in_order=0;
|
|
select distinct * from distinct_in_order except select * from ordinary_distinct;
|
|
|
|
drop table if exists distinct_in_order sync;
|
|
drop table if exists ordinary_distinct sync;
|
|
|
|
select '-- DISTINCT colums has prefix in ORDER BY columns';
|
|
create table distinct_in_order (CounterID UInt32, EventDate Date) engine=MergeTree() order by (CounterID, EventDate);
|
|
insert into distinct_in_order select distinct CounterID, EventDate from test.hits order by CounterID settings optimize_distinct_in_order=1;
|
|
create table ordinary_distinct (CounterID UInt32, EventDate Date) engine=MergeTree() order by (CounterID, EventDate);
|
|
insert into ordinary_distinct select distinct CounterID, EventDate from test.hits order by CounterID settings optimize_distinct_in_order=0;
|
|
select distinct * from distinct_in_order except select * from ordinary_distinct;
|
|
|
|
drop table if exists distinct_in_order sync;
|
|
drop table if exists ordinary_distinct sync;
|