support altering generated column

daichirata / hammer

🛠 hammer is a command-line tool to schema management for Google Cloud Spanner.

MIT License

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Closed yokoyama10 closed 3 years ago

yokoyama10 commented 3 years ago

I added support for "generated column" on the diff generator.

Generated columns do not accept ALTER COLUMN, then must be re-created using DROP and ADD.
- https://cloud.google.com/spanner/docs/generated-column/how-to#modify-generated-column
Generated columns with NOT NULL constraint have not to set zero value.

daichirata commented 3 years ago

Merged. thank you!