ClickHouse/tests/queries/0_stateless/03143_prewhere_profile_events.sh
2024-06-08 00:12:41 +02:00

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#!/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';
"