## 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) [ Full content available at: https://github.com/apache/flink/pull/6781 ] This message was relayed via gitbox.apache.org for [email protected]
