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Update column.md

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docs/en/sql-reference/statements/alter/column.md
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@ -204,8 +204,9 @@ It is used if it is necessary to add or update a column with a complicated expre
Syntax:
```sql
ALTER TABLE table MATERIALIZE COLUMN col;
ALTER TABLE table MATERIALIZE COLUMN col [IN PARTITION partition | IN PARTITION ID 'partition_id'];
```
- If you specify a PARTITION, a column will be materialized with only the specified partition.
**Example**