[jira] [Created] (FLINK-3319) Add or operator to CEP's pattern API

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-3319:
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             Summary: Add or operator to CEP's pattern API
                 Key: FLINK-3319
                 URL: https://issues.apache.org/jira/browse/FLINK-3319
             Project: Flink
          Issue Type: Improvement
          Components: CEP
    Affects Versions: 1.0.0
            Reporter: Till Rohrmann
            Priority: Minor


Adding an {{or}} operator to CEP's pattern API would be beneficial. This would considerably extend the set of supported patterns. The {{or}} operator lets you define multiple succeeding pattern states for the next stage.

{code}
Pattern.begin("start").next("middle1").where(...).or("middle2").where(...)
{code}

In order to implement the {{or}} operator, one has to extend the {{Pattern}} class. Furthermore, the {{NFACompiler}} has to be extended to generate two resulting pattern states in case of an {{or}} operator.



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