Generated columns no longer require the STORED attribute. Without this, the generated column is evaluated at query or index time and doesn't require additional storage or write overhead
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## Feature
Generated columns no longer require the `STORED` attribute. Without this, the generated column is evaluated at query or index time and doesn't require additional storage or write overhead. For more information, see [Create and manage generated columns](https://cloud.google.com/spanner/docs/generated-column/how-to).