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Posted to issues@flink.apache.org by "Dawid Wysakowicz (JIRA)" <ji...@apache.org> on 2018/10/18 07:24:00 UTC

[jira] [Created] (FLINK-10588) Support reusing same variable in Pattern

Dawid Wysakowicz created FLINK-10588:
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             Summary: Support reusing same variable in Pattern
                 Key: FLINK-10588
                 URL: https://issues.apache.org/jira/browse/FLINK-10588
             Project: Flink
          Issue Type: Sub-task
          Components: CEP, Table API &amp; SQL
    Affects Versions: 1.7.0
            Reporter: Dawid Wysakowicz


One should be able to use the same variable multiple times in a pattern. So we should allow patterns like (A B A).

CEP library enforces unique names for patterns. A simple workaround to generate artificial unique names won't work in this case because having multiple patterns with same name puts additional constraints on AFTER MATCH SKIP as it skips to LAST/FIRST element of elements assigned to both instances.



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