WeiZhong94 opened a new pull request #8561: [FLINK-12588][python] Add TableSchema for Python Table API. URL: https://github.com/apache/flink/pull/8561 ## What is the purpose of the change This pull request is intended to add TableSchema for Python Table API. For this goal, a `_to_python_type` function is introduced in this pull request. This function is for converting Java's DataType and TypeInformation objects into Python's DataType objects. For ensuring that `_to_python_type` and the existing `_to_java_type` are mutually inverse functions, this PR makes some changes on the flink python type system. ## Brief change log - *Add the `TableSchema` class.* - *Add `get_schema` method in `Table` class.* - *Add `schema` method in `OldCsv` and `Schema` class.* - *Add `_to_python_type` function.* - *Changed many default value and default behavior of current data types.* ## Verifying this change Added integration tests in `test_table_schema.py`, `test_schema_operation.py` and `test_types.py`. ## 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, Yarn/Mesos, 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? (python docs)
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