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11 lines
603 B
MySQL
11 lines
603 B
MySQL
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create table if not exists t_group_by_lowcardinality(p_date Date, val LowCardinality(Nullable(String)))
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engine=MergeTree() partition by p_date order by tuple();
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insert into t_group_by_lowcardinality select today() as p_date, toString(number/5) as val from numbers(10000);
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insert into t_group_by_lowcardinality select today() as p_date, Null as val from numbers(100);
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select val, avg(toUInt32(val)) from t_group_by_lowcardinality group by val limit 10 settings max_threads=1, max_rows_to_group_by=100, group_by_overflow_mode='any' format JSONEachRow;
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drop table if exists t_group_by_lowcardinality;
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