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sql: clarify unsupported behavior in generated column #2000

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Mar 11, 2020
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sql: clarify unsupported behavior in generated column #2000

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3 changes: 3 additions & 0 deletions reference/sql/generated-columns.md
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Expand Up @@ -85,4 +85,7 @@ The current limitations of JSON and generated columns are as follows:

- You cannot add the generated column in the storage type of `STORED` through `ALTER TABLE`.
- You cannot create an index on the generated column through `ALTER TABLE`.
- You can neither convert a generated stored column to a normal column through the `ALTER TABLE` statement nor convert a normal column to a generated stored column.
- You cannot modify the **expression** of a generated stored column through the `ALTER TABLE` statement.
- You cannot assign the `DEFAULT` value to generated columns in DML statements.
- Not all [JSON functions](/reference/sql/functions-and-operators/json-functions.md) are supported.