[jira] [Created] (FLINK-6248) Make the optional() available to all offered patterns.

["Kostas Kloudas (JIRA)" <ji...@apache.org>]

Kostas Kloudas created FLINK-6248:
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             Summary: Make the optional() available to all offered patterns.
                 Key: FLINK-6248
                 URL: https://issues.apache.org/jira/browse/FLINK-6248
             Project: Flink
          Issue Type: Improvement
          Components: CEP
    Affects Versions: 1.3.0
            Reporter: Kostas Kloudas
             Fix For: 1.3.0


Currently the {{optional()}} quantifier is available as a separate pattern. This issue proposes to make it available as a flag to all patterns.

This implies that: 
1) a singleton pattern with {{optional=true}} will become the current {{OPTIONAL}}, 
2) a {{oneToMany}} will become {{zeroToMany}}, 
3) the {{zeroToMany}} will not exist as a direct option in the {{Pattern}} class, and 
4) the {{times()}} will require some changes in the {{NFACompiler}}.



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