mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-12 17:32:32 +00:00
54 lines
1.3 KiB
SQL
54 lines
1.3 KiB
SQL
DROP TABLE IF EXISTS collapsing_table;
|
|
SET optimize_on_insert = 0;
|
|
|
|
CREATE TABLE collapsing_table
|
|
(
|
|
key UInt64,
|
|
value UInt64,
|
|
Sign Int8
|
|
)
|
|
ENGINE = CollapsingMergeTree(Sign)
|
|
ORDER BY key
|
|
SETTINGS
|
|
vertical_merge_algorithm_min_rows_to_activate=0,
|
|
vertical_merge_algorithm_min_columns_to_activate=0,
|
|
min_bytes_for_wide_part = 0;
|
|
|
|
INSERT INTO collapsing_table SELECT if(number == 8192, 8191, number), 1, if(number == 8192, +1, -1) FROM numbers(8193);
|
|
|
|
SELECT sum(Sign), count() from collapsing_table;
|
|
|
|
OPTIMIZE TABLE collapsing_table FINAL;
|
|
|
|
SELECT sum(Sign), count() from collapsing_table;
|
|
|
|
DROP TABLE IF EXISTS collapsing_table;
|
|
|
|
|
|
DROP TABLE IF EXISTS collapsing_suspicious_granularity;
|
|
|
|
CREATE TABLE collapsing_suspicious_granularity
|
|
(
|
|
key UInt64,
|
|
value UInt64,
|
|
Sign Int8
|
|
)
|
|
ENGINE = CollapsingMergeTree(Sign)
|
|
ORDER BY key
|
|
SETTINGS
|
|
vertical_merge_algorithm_min_rows_to_activate=0,
|
|
vertical_merge_algorithm_min_columns_to_activate=0,
|
|
min_bytes_for_wide_part = 0,
|
|
index_granularity = 1;
|
|
|
|
INSERT INTO collapsing_suspicious_granularity VALUES (1, 1, -1) (1, 1, 1);
|
|
|
|
SELECT sum(Sign), count() from collapsing_suspicious_granularity;
|
|
|
|
OPTIMIZE TABLE collapsing_suspicious_granularity FINAL;
|
|
|
|
SELECT sum(Sign), count() from collapsing_suspicious_granularity;
|
|
|
|
|
|
DROP TABLE IF EXISTS collapsing_suspicious_granularity;
|