mirror of
https://github.com/ClickHouse/ClickHouse.git
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138 lines
5.1 KiB
SQL
138 lines
5.1 KiB
SQL
DROP TABLE IF EXISTS test_table;
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CREATE TABLE test_table
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(
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`timestamp` DateTime,
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`value` UInt64,
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`day` Date ALIAS toDate(timestamp),
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`day1` Date ALIAS day + 1,
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`day2` Date ALIAS day1 + 1,
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`time` DateTime ALIAS timestamp
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)
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ENGINE = MergeTree
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PARTITION BY toYYYYMMDD(timestamp)
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ORDER BY timestamp SETTINGS index_granularity = 1;
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INSERT INTO test_table(timestamp, value) SELECT toDateTime('2020-01-01 12:00:00'), 1 FROM numbers(10);
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INSERT INTO test_table(timestamp, value) SELECT toDateTime('2020-01-02 12:00:00'), 1 FROM numbers(10);
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INSERT INTO test_table(timestamp, value) SELECT toDateTime('2020-01-03 12:00:00'), 1 FROM numbers(10);
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set optimize_respect_aliases = 1;
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SELECT 'test-partition-prune';
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SELECT COUNT() = 10 FROM test_table WHERE day = '2020-01-01' SETTINGS max_rows_to_read = 10;
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SELECT t = '2020-01-03' FROM (SELECT day AS t FROM test_table WHERE t = '2020-01-03' GROUP BY t SETTINGS max_rows_to_read = 10);
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SELECT COUNT() = 10 FROM test_table WHERE day = '2020-01-01' UNION ALL SELECT 1 FROM numbers(1) SETTINGS max_rows_to_read = 11;
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SELECT COUNT() = 0 FROM (SELECT toDate('2019-01-01') AS day, day AS t FROM test_table PREWHERE t = '2020-01-03' WHERE t = '2020-01-03' GROUP BY t );
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SELECT 'test-join';
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SELECT day = '2020-01-03'
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FROM
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(
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SELECT toDate('2020-01-03') AS day
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FROM numbers(1)
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) AS a
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INNER JOIN
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(
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SELECT day
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FROM test_table
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WHERE day = '2020-01-03'
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GROUP BY day
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) AS b ON a.day = b.day SETTINGS max_rows_to_read = 11;
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SELECT day = '2020-01-01'
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FROM
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(
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SELECT day
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FROM test_table
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WHERE day = '2020-01-01'
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GROUP BY day
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) AS a
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INNER JOIN
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(
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SELECT toDate('2020-01-01') AS day
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FROM numbers(1)
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) AS b ON a.day = b.day SETTINGS max_rows_to_read = 11;
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SELECT 'alias2alias';
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SELECT COUNT() = 10 FROM test_table WHERE day1 = '2020-01-02' SETTINGS max_rows_to_read = 10;
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SELECT t = '2020-01-03' FROM (SELECT day1 AS t FROM test_table WHERE t = '2020-01-03' GROUP BY t SETTINGS max_rows_to_read = 10);
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SELECT t = '2020-01-03' FROM (SELECT day2 AS t FROM test_table WHERE t = '2020-01-03' GROUP BY t SETTINGS max_rows_to_read = 10);
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SELECT COUNT() = 10 FROM test_table WHERE day1 = '2020-01-03' UNION ALL SELECT 1 FROM numbers(1) SETTINGS max_rows_to_read = 11;
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SELECT COUNT() = 0 FROM (SELECT toDate('2019-01-01') AS day1, day1 AS t FROM test_table PREWHERE t = '2020-01-03' WHERE t = '2020-01-03' GROUP BY t );
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SELECT day1 = '2020-01-04' FROM test_table PREWHERE day1 = '2020-01-04' WHERE day1 = '2020-01-04' GROUP BY day1 SETTINGS max_rows_to_read = 10;
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ALTER TABLE test_table add column array Array(UInt8) default [1, 2, 3];
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ALTER TABLE test_table add column struct.key Array(UInt8) default [2, 4, 6], add column struct.value Array(UInt8) alias array;
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SELECT 'array-join';
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set max_rows_to_read = 10;
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SELECT count() == 10 FROM test_table WHERE day = '2020-01-01';
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SELECT sum(struct.key) == 30, sum(struct.value) == 30 FROM (SELECT struct.key, struct.value FROM test_table array join struct WHERE day = '2020-01-01');
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SELECT 'lambda';
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-- lambda parameters in filter should not be rewrite
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SELECT count() == 10 FROM test_table WHERE arrayMap((day) -> day + 1, [1,2,3]) [1] = 2 AND day = '2020-01-03';
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set max_rows_to_read = 0;
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SELECT 'optimize_read_in_order';
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EXPLAIN SELECT day AS s FROM test_table ORDER BY s LIMIT 1 SETTINGS optimize_read_in_order = 0;
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EXPLAIN SELECT day AS s FROM test_table ORDER BY s LIMIT 1 SETTINGS optimize_read_in_order = 1;
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EXPLAIN SELECT toDate(timestamp) AS s FROM test_table ORDER BY toDate(timestamp) LIMIT 1 SETTINGS optimize_read_in_order = 1;
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SELECT 'optimize_aggregation_in_order';
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EXPLAIN SELECT day, count() AS s FROM test_table GROUP BY day SETTINGS optimize_aggregation_in_order = 0;
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EXPLAIN SELECT day, count() AS s FROM test_table GROUP BY day SETTINGS optimize_aggregation_in_order = 1;
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EXPLAIN SELECT toDate(timestamp), count() AS s FROM test_table GROUP BY toDate(timestamp) SETTINGS optimize_aggregation_in_order = 1;
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DROP TABLE test_table;
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SELECT 'second-index';
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DROP TABLE IF EXISTS test_index;
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CREATE TABLE test_index
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(
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`key_string` String,
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`key_uint32` ALIAS toUInt32(key_string),
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INDEX idx toUInt32(key_string) TYPE set(0) GRANULARITY 1
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)
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ENGINE = MergeTree
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PARTITION BY tuple()
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PRIMARY KEY tuple()
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ORDER BY key_string SETTINGS index_granularity = 1;
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INSERT INTO test_index SELECT * FROM numbers(10);
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set max_rows_to_read = 1;
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SELECT COUNT() == 1 FROM test_index WHERE key_uint32 = 1;
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SELECT COUNT() == 1 FROM test_index WHERE toUInt32(key_string) = 1;
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DROP TABLE IF EXISTS test_index;
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-- check alias column can be used to match projections
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drop table if exists p;
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create table pd (dt DateTime, i int, dt_m DateTime alias toStartOfMinute(dt)) engine Distributed(test_shard_localhost, currentDatabase(), 'pl');
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create table pl (dt DateTime, i int, projection p (select sum(i) group by toStartOfMinute(dt))) engine MergeTree order by dt;
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insert into pl values ('2020-10-24', 1);
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select sum(i) from pd group by dt_m settings allow_experimental_projection_optimization = 1, force_optimize_projection = 1;
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drop table pd;
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drop table pl;
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drop table if exists t;
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create temporary table t (x UInt64, y alias x);
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insert into t values (1);
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select sum(x), sum(y) from t;
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drop table t;
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