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Update column.md
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@ -212,6 +212,9 @@ SET mutations_sync = 2;
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CREATE TABLE tmp (x Int64) ENGINE = MergeTree() ORDER BY tuple() PARTITION BY tuple();
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INSERT INTO tmp SELECT * FROM system.numbers LIMIT 10;
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ALTER TABLE tmp ADD COLUMN s String MATERIALIZED toString(x);
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ALTER TABLE tmp MATERIALIZE COLUMN s;
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SELECT groupArray(x), groupArray(s) FROM tmp;
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```
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