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*: add a limitation about not supporting NULLIF() and supporting CASE #18677

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merged 6 commits into from
Sep 2, 2024
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*: add a limitation about not supporting NULLIF() and supporting CASE #18677

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Update generated-columns.md
Frank945946 Aug 23, 2024
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3 changes: 2 additions & 1 deletion generated-columns.md
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Expand Up @@ -153,5 +153,6 @@ The current limitations of JSON and generated columns are as follows:
- You cannot add a stored generated column through `ALTER TABLE`.
- You can neither convert a stored generated column to a normal column through the `ALTER TABLE` statement nor convert a normal column to a stored generated column.
- You cannot modify the expression of a stored generated column through the `ALTER TABLE` statement.
- Not all [JSON functions](/functions-and-operators/json-functions.md) are supported;
- Not all [JSON functions](/functions-and-operators/json-functions.md) are supported.
- The [`NULLIF()` function](/functions-and-operators/control-flow-functions.md#nullif) is not supported. You can use the [`CASE` function](/functions-and-operators/control-flow-functions.md#case) instead.
- Currently, the generated column index replacement rule is valid only when the generated column is a virtual generated column. It is not valid on the stored generated column, but the index can still be used by directly using the generated column itself.
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