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18 lines
720 B
MySQL
18 lines
720 B
MySQL
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SET allow_experimental_low_cardinality_type = 1;
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drop table if exists test.lc;
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drop table if exists test.lc_mv;
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create table test.lc (str StringWithDictionary) engine = MergeTree order by tuple();
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insert into test.lc values ('a'), ('bbb'), ('ab'), ('accccc'), ('baasddas'), ('bcde');
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CREATE MATERIALIZED VIEW test.lc_mv ENGINE = AggregatingMergeTree() ORDER BY tuple() populate AS SELECT substring(str, 1, 1) as letter, min(length(str)) AS min_len, max(length(str)) AS max_len FROM test.lc GROUP BY substring(str, 1, 1);
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insert into test.lc values ('a'), ('bbb'), ('ab'), ('accccc'), ('baasddas'), ('bcde');
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select * from test.lc_mv order by letter;
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drop table if exists test.lc;
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drop table if exists test.lc_mv;
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