ClickHouse/dbms/tests/queries/0_stateless/00712_prewhere_with_sampling.sql

drop table if exists tab_00712_2;
create table tab_00712_2 (a UInt32, b UInt32) engine = MergeTree order by b % 2 sample by b % 2;
insert into tab_00712_2 values (1, 2), (1, 4);
select a from tab_00712_2 sample 1 / 2 prewhere b = 2;
drop table if exists tab_00712_2;

DROP TABLE IF EXISTS sample_prewhere;
CREATE TABLE sample_prewhere (CounterID UInt32, UserID UInt64) ENGINE = MergeTree ORDER BY UserID SAMPLE BY UserID;
SELECT count() FROM sample_prewhere SAMPLE 1/2 PREWHERE CounterID = 1;
DROP TABLE sample_prewhere;