ClickHouse/dbms/tests/queries/0_stateless/00578_merge_table_sampling.sql

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DROP TABLE IF EXISTS test.numbers1;
DROP TABLE IF EXISTS test.numbers2;
CREATE TABLE test.numbers1 ENGINE = Memory AS SELECT number FROM numbers(1000);
CREATE TABLE test.numbers2 ENGINE = Memory AS SELECT number FROM numbers(1000);
SELECT * FROM merge(test, '^numbers\\d+$') SAMPLE 0.1; -- { serverError 141 }
DROP TABLE test.numbers1;
DROP TABLE test.numbers2;
CREATE TABLE test.numbers1 ENGINE = MergeTree ORDER BY intHash32(number) SAMPLE BY intHash32(number) AS SELECT number FROM numbers(1000);
CREATE TABLE test.numbers2 ENGINE = MergeTree ORDER BY intHash32(number) SAMPLE BY intHash32(number) AS SELECT number FROM numbers(1000);
SELECT * FROM merge(test, '^numbers\\d+$') SAMPLE 0.01;
DROP TABLE test.numbers1;
DROP TABLE test.numbers2;