mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-20 05:05:38 +00:00
67 lines
2.7 KiB
MySQL
67 lines
2.7 KiB
MySQL
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DROP TABLE IF EXISTS t_proj_external;
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CREATE TABLE t_proj_external
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(
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k1 UInt32,
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k2 UInt32,
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k3 UInt32,
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value UInt32
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)
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ENGINE = MergeTree
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ORDER BY tuple();
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INSERT INTO t_proj_external SELECT 1, number%2, number%4, number FROM numbers(50000);
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SYSTEM STOP MERGES t_proj_external;
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ALTER TABLE t_proj_external ADD PROJECTION aaaa (
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SELECT
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k1,
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k2,
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k3,
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sum(value)
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GROUP BY k1, k2, k3
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);
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INSERT INTO t_proj_external SELECT 1, number%2, number%4, number FROM numbers(100000) LIMIT 50000, 100000;
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SELECT '*** correct aggregation ***';
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SELECT k1, k2, k3, sum(value) v FROM t_proj_external GROUP BY k1, k2, k3 ORDER BY k1, k2, k3 SETTINGS optimize_use_projections = 0;
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SELECT '*** correct aggregation with projection ***';
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SELECT k1, k2, k3, sum(value) v FROM t_proj_external GROUP BY k1, k2, k3 ORDER BY k1, k2, k3;
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SELECT '*** optimize_aggregation_in_order = 0, max_bytes_before_external_group_by = 1, group_by_two_level_threshold = 1 ***';
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SELECT k1, k2, k3, sum(value) v FROM t_proj_external GROUP BY k1, k2, k3 ORDER BY k1, k2, k3 SETTINGS optimize_aggregation_in_order = 0, max_bytes_before_external_group_by = 1, group_by_two_level_threshold = 1;
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SELECT '*** optimize_aggregation_in_order = 1, max_bytes_before_external_group_by = 1, group_by_two_level_threshold = 1 ***';
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SELECT k1, k2, k3, sum(value) v FROM t_proj_external GROUP BY k1, k2, k3 ORDER BY k1, k2, k3 SETTINGS optimize_aggregation_in_order = 1, max_bytes_before_external_group_by = 1, group_by_two_level_threshold = 1;
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SYSTEM START MERGES t_proj_external;
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ALTER TABLE t_proj_external MATERIALIZE PROJECTION aaaa SETTINGS mutations_sync = 2;
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SELECT '*** after materialization ***';
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SELECT '*** correct aggregation ***';
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SELECT k1, k2, k3, sum(value) v FROM t_proj_external GROUP BY k1, k2, k3 ORDER BY k1, k2, k3 SETTINGS optimize_use_projections = 0;
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SELECT '*** correct aggregation with projection ***';
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SELECT k1, k2, k3, sum(value) v FROM t_proj_external GROUP BY k1, k2, k3 ORDER BY k1, k2, k3;
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SELECT '*** optimize_aggregation_in_order = 0, max_bytes_before_external_group_by = 1, group_by_two_level_threshold = 1 ***';
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SELECT k1, k2, k3, sum(value) v FROM t_proj_external GROUP BY k1, k2, k3 ORDER BY k1, k2, k3 SETTINGS optimize_aggregation_in_order = 0, max_bytes_before_external_group_by = 1, group_by_two_level_threshold = 1;
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SELECT '*** optimize_aggregation_in_order = 1, max_bytes_before_external_group_by = 1, group_by_two_level_threshold = 1 ***';
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SELECT k1, k2, k3, sum(value) v FROM t_proj_external GROUP BY k1, k2, k3 ORDER BY k1, k2, k3 SETTINGS optimize_aggregation_in_order = 1, max_bytes_before_external_group_by = 1, group_by_two_level_threshold = 1;
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DROP TABLE IF EXISTS t_proj_external;
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