mirror of
https://github.com/ClickHouse/ClickHouse.git
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28 lines
1.0 KiB
Bash
28 lines
1.0 KiB
Bash
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#!/usr/bin/env bash
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CUR_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
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# shellcheck source=../shell_config.sh
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. "$CUR_DIR"/../shell_config.sh
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${CLICKHOUSE_CLIENT} --multiquery --query "
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drop table if exists aliases_lazyness;
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create table aliases_lazyness (x UInt32, y ALIAS sleepEachRow(0.1)) Engine=MergeTree ORDER BY x;
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insert into aliases_lazyness(x) select * from numbers(40);
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"
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# In very old ClickHouse versions alias column was calculated for every row.
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# If it works this way, the query will take at least 0.1 * 40 = 4 seconds.
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# If the issue does not exist, the query should take slightly more than 0.1 seconds.
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# The exact time is not guaranteed, so we check in a loop that at least once
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# the query will process in less than one second, that proves that the behaviour is not like it was long time ago.
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while true
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do
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timeout 1 ${CLICKHOUSE_CLIENT} --query "SELECT x, y FROM aliases_lazyness WHERE x = 1 FORMAT Null" && break
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done
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${CLICKHOUSE_CLIENT} --multiquery --query "
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drop table aliases_lazyness;
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SELECT 'Ok';
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"
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