LadyForest opened a new pull request, #21640:
URL: https://github.com/apache/flink/pull/21640
## What is the purpose of the change
This pull request is a subtask of FLINK-21634 and aims to support the `ALTER
TALBE IF EXISTS <table_identifier> ...` statement.
## Brief change log
- 6167b501 extends the parser template to support `IF EXISTS` and adjusts
`SqlAlterTable` to add `ifExists` to the constructor params. During the
operation conversion phase, `SqlToOperationConverter` will convert the alter
statement to a `NopOperation` to be ignored if the table does not exist and `IF
EXISTS` is specified.
## Verifying this change
This change added tests and can be verified as follows:
- FlinkSqlParserImplTest
- SqlToOperationConverterTest
- table.q
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): No
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: No
- The serializers: No
- The runtime per-record code paths (performance sensitive): No
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: No
- The S3 file system connector: No
## Documentation
- Does this pull request introduces a new feature? Yes
- If yes, how is the feature documented? It'll be documented after
FLINK-22320 finishes
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