[GitHub] [flink] dawidwys opened a new pull request #10512: [FLINK-15092][java, table] Remove the restriction that GenericCsvInputFormat expects at least one parser

[GitBox <gi...@apache.org>]

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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