mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-02 20:42:04 +00:00
74 lines
3.6 KiB
MySQL
74 lines
3.6 KiB
MySQL
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DROP TABLE IF EXISTS t1;
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SET allow_experimental_statistics = 1;
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SET allow_statistics_optimize = 1;
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SET mutations_sync = 1;
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CREATE TABLE t1
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(
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a Float64 STATISTICS(tdigest),
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b Int64 STATISTICS(tdigest),
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c Int64 STATISTICS(tdigest, uniq),
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pk String,
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) Engine = MergeTree() ORDER BY pk
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SETTINGS min_bytes_for_wide_part = 0;
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SHOW CREATE TABLE t1;
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INSERT INTO t1 select number, -number, number/1000, generateUUIDv4() FROM system.numbers LIMIT 10000;
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INSERT INTO t1 select 0, 0, 11, generateUUIDv4();
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SELECT 'After insert';
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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%';
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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%';
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OPTIMIZE TABLE t1 FINAL;
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SELECT 'After merge';
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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%';
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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%';
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SELECT 'After modify TDigest';
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ALTER TABLE t1 MODIFY STATISTICS c TYPE TDigest;
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ALTER TABLE t1 MATERIALIZE STATISTICS c;
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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%';
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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%';
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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%';
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ALTER TABLE t1 DROP STATISTICS c;
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SELECT 'After drop';
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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%';
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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%';
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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%';
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DROP TABLE IF EXISTS t1;
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DROP TABLE IF EXISTS t2;
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SET allow_suspicious_low_cardinality_types=1;
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CREATE TABLE t2
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(
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a Float64 STATISTICS(tdigest),
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b Int64 STATISTICS(tdigest),
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c LowCardinality(Int64) STATISTICS(tdigest, uniq),
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pk String,
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) Engine = MergeTree() ORDER BY pk
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SETTINGS min_bytes_for_wide_part = 0;
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INSERT INTO t2 select number, -number, number/1000, generateUUIDv4() FROM system.numbers LIMIT 10000;
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DROP TABLE IF EXISTS t2;
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DROP TABLE IF EXISTS t3;
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CREATE TABLE t3
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(
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a Float64 STATISTICS(tdigest),
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b Int64 STATISTICS(tdigest),
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c Nullable(Int64) STATISTICS(tdigest, uniq),
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pk String,
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) Engine = MergeTree() ORDER BY pk
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SETTINGS min_bytes_for_wide_part = 0;
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INSERT INTO t3 select number, -number, number/1000, generateUUIDv4() FROM system.numbers LIMIT 10000;
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DROP TABLE IF EXISTS t3;
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