ClickHouse/tests/queries/0_stateless/02245_weird_partitions_pruning.sql
2022-12-20 13:36:21 +00:00

64 lines
2.9 KiB
SQL

-- Tags: no-random-merge-tree-settings
-- We use a hack - partition by ignore(d1). In some cases there are two columns
-- not fully correlated (<1) (date_begin - date_end or datetime - datetime_in_TZ_with_DST)
-- If we partition by these columns instead of one it will be twice more partitions.
-- Partition by (.., ignore(d1)) allows to partition by the first column but build
-- min_max indexes for both column, so partition pruning works for both columns.
-- It's very similar to min_max skip index but gives bigger performance boost,
-- because partition pruning happens on very early query stage.
DROP TABLE IF EXISTS weird_partitions_02245;
CREATE TABLE weird_partitions_02245(d DateTime, d1 DateTime default d - toIntervalHour(8), id Int64)
Engine=MergeTree
PARTITION BY (toYYYYMM(toDateTime(d)), ignore(d1))
ORDER BY id;
INSERT INTO weird_partitions_02245(d, id)
SELECT
toDateTime('2021-12-31 22:30:00') AS d,
number
FROM numbers(1000);
INSERT INTO weird_partitions_02245(d, id)
SELECT
toDateTime('2022-01-01 00:30:00') AS d,
number
FROM numbers(1000);
INSERT INTO weird_partitions_02245(d, id)
SELECT
toDateTime('2022-01-31 22:30:00') AS d,
number
FROM numbers(1000);
INSERT INTO weird_partitions_02245(d, id)
SELECT
toDateTime('2023-01-31 22:30:00') AS d,
number
FROM numbers(1000);
OPTIMIZE TABLE weird_partitions_02245;
OPTIMIZE TABLE weird_partitions_02245;
SELECT DISTINCT _partition_id, _partition_value FROM weird_partitions_02245 ORDER BY _partition_id ASC;
SELECT _partition_id, min(d), max(d), min(d1), max(d1), count() FROM weird_partitions_02245 GROUP BY _partition_id ORDER BY _partition_id ASC;
select DISTINCT _partition_id from weird_partitions_02245 where d >= '2021-12-31 00:00:00' and d < '2022-01-01 00:00:00' ORDER BY _partition_id;
explain estimate select DISTINCT _partition_id from weird_partitions_02245 where d >= '2021-12-31 00:00:00' and d < '2022-01-01 00:00:00';
select DISTINCT _partition_id from weird_partitions_02245 where d >= '2022-01-01 00:00:00' and d1 >= '2021-12-31 00:00:00' and d1 < '2022-01-01 00:00:00' ORDER BY _partition_id;;
explain estimate select DISTINCT _partition_id from weird_partitions_02245 where d >= '2022-01-01 00:00:00' and d1 >= '2021-12-31 00:00:00' and d1 < '2022-01-01 00:00:00';
select DISTINCT _partition_id from weird_partitions_02245 where d1 >= '2021-12-31 00:00:00' and d1 < '2022-01-01 00:00:00' ORDER BY _partition_id;;
explain estimate select DISTINCT _partition_id from weird_partitions_02245 where d1 >= '2021-12-31 00:00:00' and d1 < '2022-01-01 00:00:00';
select DISTINCT _partition_id from weird_partitions_02245 where d >= '2022-01-01 00:00:00' and d1 >= '2021-12-31 00:00:00' and d1 < '2020-01-01 00:00:00' ORDER BY _partition_id;;
explain estimate select DISTINCT _partition_id from weird_partitions_02245 where d >= '2022-01-01 00:00:00' and d1 >= '2021-12-31 00:00:00' and d1 < '2020-01-01 00:00:00';
DROP TABLE weird_partitions_02245;