ClickHouse/dbms/tests/queries/0_stateless/00971_merge_tree_uniform_read_distribution_and_max_rows_to_read.sql
Amos Bird 2c75a51d4f
Instant count() for MergeTree
Use (Replicated)MergeTree's metadata to do trivial count()
2019-10-29 17:45:47 +08:00

23 lines
663 B
SQL

DROP TABLE IF EXISTS merge_tree;
CREATE TABLE merge_tree (x UInt8) ENGINE = MergeTree ORDER BY x;
INSERT INTO merge_tree SELECT 0 FROM numbers(1000000);
SET max_threads = 4;
SET max_rows_to_read = 1100000;
SET merge_tree_uniform_read_distribution = 1;
SELECT count() FROM merge_tree;
SET merge_tree_uniform_read_distribution = 0;
SELECT count() FROM merge_tree;
SET max_rows_to_read = 900000;
SET merge_tree_uniform_read_distribution = 1;
SELECT count() FROM merge_tree WHERE not ignore(); -- { serverError 158 }
SET merge_tree_uniform_read_distribution = 0;
SELECT count() FROM merge_tree WHERE not ignore(); -- { serverError 158 }
DROP TABLE merge_tree;