SteNicholas opened a new pull request #17155: URL: https://github.com/apache/flink/pull/17155
## What is the purpose of the change *`ALTER TABLE` does not seem to support the `IF EXISTS` part in the DDL, but the corresponding methods `Catalog#renameTable` and `Catalog#alterTable` do support it. Flink DDL should support `IF EXISTS` in DDL for `ALTER TABLE`.* ## Brief change log - *Add the `IF EXISTS` syntax support for the `ALTER TABLE` DDL.* ## Verifying this change - *`SqlToOperationConverterTest`, `CatalogTableITCase` and `table.q` add the tests for `ALTER TABLE IF EXISTS` syntax.* ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (yes / **no**) - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org