ClickHouse/tests/performance/trim_whitespace.xml

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<test>
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<create_query>
create table if not exists whitespaces
engine = MergeTree() partition by tuple() order by tuple()
as
with 32 - log2(intHash32(number)) + 1 as num_spaces,
repeat(' ', toUInt32(num_spaces)) as spaces
select spaces || toString(number) || spaces value
from numbers_mt(100000000);
</create_query>
<substitutions>
<substitution>
<name>func</name>
<values>
<value>trimLeft(value)</value>
<value>trimRight(value)</value>
<value>trimBoth(value)</value>
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</values>
</substitution>
<substitution>
<name>func_slow</name>
<values>
<value>replaceRegexpOne(value, '^ *', '')</value>
<value>replaceRegexpOne(value, ' *$', '')</value>
<value>replaceRegexpAll(value, '^ *| *$', '')</value>
</values>
</substitution>
</substitutions>
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<query>SELECT {func} FROM whitespaces FORMAT Null</query>
<query>SELECT {func_slow} FROM whitespaces LIMIT 10000000 FORMAT Null</query>
<drop_query>DROP TABLE IF EXISTS whitespaces</drop_query>
</test>