HuangXingBo opened a new pull request #9969: [FLINK-14022][table-planner][table-planner-blink] Add validation check for places where Python ScalarFunction cannot be used URL: https://github.com/apache/flink/pull/9969 ## What is the purpose of the change *Currently, there are places where Python ScalarFunction could not be used, for example:* - *Python UDF could not be used in MatchRecognize* - *Python UDFs could not be used in Join condition which take the columns from both the left table and the right table as inputs* We should add validation check for places where it’s not supported. ## Brief change log This change added tests and can be verified as follows: * add join and matchRecognize tests* ## 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? (no) - If yes, how is the feature documented? (not applicable)
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