mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-20 08:40:50 +00:00
73 lines
3.6 KiB
SQL
73 lines
3.6 KiB
SQL
DROP TABLE IF EXISTS t1;
|
|
|
|
SET allow_experimental_statistics = 1;
|
|
SET allow_statistics_optimize = 1;
|
|
SET mutations_sync = 1;
|
|
|
|
CREATE TABLE t1
|
|
(
|
|
a Float64 STATISTICS(tdigest),
|
|
b Int64 STATISTICS(tdigest),
|
|
c Int64 STATISTICS(tdigest, uniq),
|
|
pk String,
|
|
) Engine = MergeTree() ORDER BY pk
|
|
SETTINGS min_bytes_for_wide_part = 0;
|
|
|
|
SHOW CREATE TABLE t1;
|
|
|
|
INSERT INTO t1 select number, -number, number/1000, generateUUIDv4() FROM system.numbers LIMIT 10000;
|
|
INSERT INTO t1 select 0, 0, 11, generateUUIDv4();
|
|
|
|
SELECT 'After insert';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c = 0 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c = 11 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
OPTIMIZE TABLE t1 FINAL;
|
|
|
|
SELECT 'After merge';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c = 0 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c = 11 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
|
|
SELECT 'After modify TDigest';
|
|
ALTER TABLE t1 MODIFY STATISTICS c TYPE TDigest;
|
|
ALTER TABLE t1 MATERIALIZE STATISTICS c;
|
|
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c = 11 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c = 0 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c < -1 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
|
|
|
|
ALTER TABLE t1 DROP STATISTICS c;
|
|
|
|
SELECT 'After drop';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c = 11 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c = 0 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
SELECT replaceRegexpAll(explain, '__table1.|_UInt8|_Int8', '') FROM (EXPLAIN actions=1 SELECT count(*) FROM t1 WHERE b < 10 and c < -1 and a < 10) WHERE explain LIKE '%Prewhere%' OR explain LIKE '%Filter column%';
|
|
|
|
DROP TABLE IF EXISTS t1;
|
|
DROP TABLE IF EXISTS t2;
|
|
SET allow_suspicious_low_cardinality_types=1;
|
|
CREATE TABLE t2
|
|
(
|
|
a Float64 STATISTICS(tdigest),
|
|
b Int64 STATISTICS(tdigest),
|
|
c LowCardinality(Int64) STATISTICS(tdigest, uniq),
|
|
pk String,
|
|
) Engine = MergeTree() ORDER BY pk
|
|
SETTINGS min_bytes_for_wide_part = 0;
|
|
INSERT INTO t2 select number, -number, number/1000, generateUUIDv4() FROM system.numbers LIMIT 10000;
|
|
|
|
DROP TABLE IF EXISTS t2;
|
|
DROP TABLE IF EXISTS t3;
|
|
|
|
CREATE TABLE t3
|
|
(
|
|
a Float64 STATISTICS(tdigest),
|
|
b Int64 STATISTICS(tdigest),
|
|
c Nullable(Int64) STATISTICS(tdigest, uniq),
|
|
pk String,
|
|
) Engine = MergeTree() ORDER BY pk
|
|
SETTINGS min_bytes_for_wide_part = 0;
|
|
INSERT INTO t3 select number, -number, number/1000, generateUUIDv4() FROM system.numbers LIMIT 10000;
|
|
|
|
DROP TABLE IF EXISTS t3;
|