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