mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-08 07:22:25 +00:00
85 lines
2.6 KiB
Bash
Executable File
85 lines
2.6 KiB
Bash
Executable File
#!/usr/bin/env bash
|
|
# Tags: no-random-settings, no-random-merge-tree-settings
|
|
|
|
CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
|
|
# shellcheck source=../shell_config.sh
|
|
. "$CURDIR"/../shell_config.sh
|
|
|
|
${CLICKHOUSE_CLIENT} -nq "
|
|
DROP TABLE IF EXISTS t;
|
|
|
|
CREATE TABLE t(a UInt32, b UInt32, c UInt32, d UInt32) ENGINE=MergeTree ORDER BY a SETTINGS min_bytes_for_wide_part=0, min_rows_for_wide_part=0;
|
|
|
|
INSERT INTO t SELECT number, number, number, number FROM numbers_mt(1e7);
|
|
|
|
OPTIMIZE TABLE t FINAL;
|
|
"
|
|
|
|
query_id_1=$RANDOM$RANDOM
|
|
query_id_2=$RANDOM$RANDOM
|
|
query_id_3=$RANDOM$RANDOM
|
|
query_id_4=$RANDOM$RANDOM
|
|
|
|
client_opts=(
|
|
--max_block_size 65409
|
|
--max_threads 8
|
|
)
|
|
|
|
${CLICKHOUSE_CLIENT} "${client_opts[@]}" --query_id "$query_id_1" -nq "
|
|
SELECT *
|
|
FROM t
|
|
PREWHERE (b % 8192) = 42
|
|
WHERE c = 42
|
|
FORMAT Null
|
|
"
|
|
|
|
${CLICKHOUSE_CLIENT} "${client_opts[@]}" --query_id "$query_id_2" -nq "
|
|
SELECT *
|
|
FROM t
|
|
PREWHERE (b % 8192) = 42 AND (c % 8192) = 42
|
|
WHERE d = 42
|
|
FORMAT Null
|
|
settings enable_multiple_prewhere_read_steps=1;
|
|
"
|
|
|
|
${CLICKHOUSE_CLIENT} "${client_opts[@]}" --query_id "$query_id_3" -nq "
|
|
SELECT *
|
|
FROM t
|
|
PREWHERE (b % 8192) = 42 AND (c % 16384) = 42
|
|
WHERE d = 42
|
|
FORMAT Null
|
|
settings enable_multiple_prewhere_read_steps=0;
|
|
"
|
|
|
|
${CLICKHOUSE_CLIENT} "${client_opts[@]}" --query_id "$query_id_4" -nq "
|
|
SELECT b, c
|
|
FROM t
|
|
PREWHERE (b % 8192) = 42 AND (c % 8192) = 42
|
|
FORMAT Null
|
|
settings enable_multiple_prewhere_read_steps=1;
|
|
"
|
|
|
|
${CLICKHOUSE_CLIENT} -nq "
|
|
SYSTEM FLUSH LOGS;
|
|
|
|
-- 52503 which is 43 * number of granules, 10000000
|
|
SELECT ProfileEvents['RowsReadByMainReader'], ProfileEvents['RowsReadByPrewhereReaders']
|
|
FROM system.query_log
|
|
WHERE current_database=currentDatabase() AND query_id = '$query_id_1' and type = 'QueryFinish';
|
|
|
|
-- 52503, 10052503 which is the sum of 10000000 from the first prewhere step plus 52503 from the second
|
|
SELECT ProfileEvents['RowsReadByMainReader'], ProfileEvents['RowsReadByPrewhereReaders']
|
|
FROM system.query_log
|
|
WHERE current_database=currentDatabase() AND query_id = '$query_id_2' and type = 'QueryFinish';
|
|
|
|
-- 26273 the same as query #1 but twice less data (43 * ceil((52503 / 43) / 2)), 10000000
|
|
SELECT ProfileEvents['RowsReadByMainReader'], ProfileEvents['RowsReadByPrewhereReaders']
|
|
FROM system.query_log
|
|
WHERE current_database=currentDatabase() AND query_id = '$query_id_3' and type = 'QueryFinish';
|
|
|
|
-- 0, 10052503
|
|
SELECT ProfileEvents['RowsReadByMainReader'], ProfileEvents['RowsReadByPrewhereReaders']
|
|
FROM system.query_log
|
|
WHERE current_database=currentDatabase() AND query_id = '$query_id_4' and type = 'QueryFinish';
|
|
"
|