[GitHub] dawidwys opened a new pull request #6781: [FLINK-10470] Add method to check if pattern can produce empty matches

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

dawidwys opened a new pull request #6781: [FLINK-10470] Add method to check if pattern can produce empty matches
URL: https://github.com/apache/flink/pull/6781
 
 
   ## What is the purpose of the change
   
   This change introduces a method that allows checking if a Pattern can produce empty matches. It is needed to disable such patterns in MATCH_RECOGNIZE, until we are able to provide a full support of empty matches in CEP (with proper support of reluctant and greedy)
   
   ## 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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