[GitHub] dawidwys opened a new pull request #6758: [FLINK-10417] Added option to throw exception on pattern variable mis…

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

dawidwys opened a new pull request #6758: [FLINK-10417] Added option to throw exception on pattern variable mis…
URL: https://github.com/apache/flink/pull/6758
 
 
   ## What is the purpose of the change
   
   Add option to throw exception when found match does not have any events mapped to variable that is used in SKIP_TO_FIRST/LAST. This is to conform with SQL standard for MATCH_RECOGNIZE.
   
   ## Brief change log
   
   * throwing exception when there is no events mapped to variable used in SKIP_TO_FIRST/LAST
   * added option to enable/disable this feature
   
   ## Verifying this change
   This change added tests and can be verified as follows:
   * `org.apache.flink.cep.nfa.AfterMatchSkipITCase#testSkipToFirstNonExistentPosition`
   * `org.apache.flink.cep.nfa.AfterMatchSkipITCase#testSkipToFirstNonExistentPositionWithoutException`
   * `org.apache.flink.cep.nfa.AfterMatchSkipITCase#testSkipToLastNonExistentPosition`
   * `org.apache.flink.cep.nfa.AfterMatchSkipITCase#testSkipToLastNonExistentPositionWithoutException`
   
   
   ## 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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