dawidwys opened a new pull request #10512: [FLINK-15092][java, table] Remove the restriction that GenericCsvInputFormat expects at least one parser URL: https://github.com/apache/flink/pull/10512 ## What is the purpose of the change GenericCsvInputFormat (and CsvInputFormat, RowCsvInputFormat transitevely) had an artificial restriction that at least one parser must have been provided. This is a limitation for a proper support of projection pushdown in flink-table, when no fields from the input are required. This lead to a safety condition check in PushProjectIntoTableSourceScanRule failing. As part of this commit a TableSourceTestBase class was introduced where we can check if table sourcec meet such requirements. ## Verifying this change This change added tests. ## 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, Yarn/Mesos, 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)
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