spena opened a new pull request, #25247:
URL: https://github.com/apache/flink/pull/25247
## What is the purpose of the change
Allow defining new columns and/or overriding source column types in the
CREATE clause on RTAS statements.
Syntax supported:
```
CREATE OR REPLACE TABLE table_name
[( <column_definition>[, ...n], [<watermark_definition>],
[<table_constraint>])]
[DISTRIBUTED BY [HASH|RANGE|RANDOM](cols) [INTO n BUCKETS]]
AS SELECT query_expression;
```
Column definition supports adding new columns and/or defining columns
already existing in the SELECT clause. Also, allows to pass PRIMARY KEY and
WATERMARK columns.
## Brief change log
- Added support for column definition, watermarks, primary keys and
distribution in the RTAS statement
## Verifying this change
This change added tests and can be verified as follows:
- Added unit tests to validation and converter classes
- Added IT tests that verify data is written and read correctly
## 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 introduce a new feature? yes
- If yes, how is the feature documented? JavaDocs (will follow-up with
another PR to update docs)
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