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18 lines
685 B
SQL
18 lines
685 B
SQL
create table tab (a String, b LowCardinality(UInt32)) engine = MergeTree order by a;
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insert into tab values ('a', 1);
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select *, toTypeName(b) from tab;
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alter table tab modify column b UInt32;
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select *, toTypeName(b) from tab;
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alter table tab modify column b LowCardinality(UInt32);
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select *, toTypeName(b) from tab;
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alter table tab modify column b StringWithDictionary;
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select *, toTypeName(b) from tab;
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alter table tab modify column b LowCardinality(UInt32);
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select *, toTypeName(b) from tab;
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alter table tab modify column b String;
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select *, toTypeName(b) from tab;
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alter table tab modify column b LowCardinality(UInt32);
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select *, toTypeName(b) from tab;
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drop table if exists tab;
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