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28 lines
1.3 KiB
SQL
28 lines
1.3 KiB
SQL
select 'NativeReader';
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select toTypeName(dict), dict, lowCardinalityIndices(dict), lowCardinalityKeys(dict) from (select '123_' || toLowCardinality(v) as dict from (select arrayJoin(['a', 'bb', '', 'a', 'ccc', 'a', 'bb', '', 'dddd']) as v));
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select '-';
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select toTypeName(dict), dict, lowCardinalityIndices(dict), lowCardinalityKeys(dict) from (select '123_' || toLowCardinality(v) as dict from (select arrayJoin(['a', Null, 'bb', '', 'a', Null, 'ccc', 'a', 'bb', '', 'dddd']) as v));
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select 'MergeTree';
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drop table if exists lc_small_dict;
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drop table if exists lc_big_dict;
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create table lc_small_dict (str StringWithDictionary) engine = MergeTree order by str SETTINGS index_granularity = 8192, index_granularity_bytes = '10Mi';
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create table lc_big_dict (str StringWithDictionary) engine = MergeTree order by str SETTINGS index_granularity = 8192, index_granularity_bytes = '10Mi';
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insert into lc_small_dict select toString(number % 1000) from system.numbers limit 1000000;
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insert into lc_big_dict select toString(number) from system.numbers limit 1000000;
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detach table lc_small_dict;
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detach table lc_big_dict;
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attach table lc_small_dict;
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attach table lc_big_dict;
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select sum(toUInt64OrZero(str)) from lc_small_dict;
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select sum(toUInt64OrZero(str)) from lc_big_dict;
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drop table if exists lc_small_dict;
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drop table if exists lc_big_dict;
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