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https://issues.apache.org/jira/browse/FLINK-10595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16721431#comment-16721431
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bupt_ljy commented on FLINK-10595:
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[~dawidwys]
I'm very curious about this empty match, could you tell me the background or
the use cases about it?
> Support patterns that can produce empty matches
> -----------------------------------------------
>
> Key: FLINK-10595
> URL: https://issues.apache.org/jira/browse/FLINK-10595
> Project: Flink
> Issue Type: Sub-task
> Components: CEP, Table API & SQL
> Reporter: Dawid Wysakowicz
> Priority: Major
>
> CEP library does not emit empty matches. In order to be SQL standard
> compliant we explicitly forbid patterns that can produce empty
> matches(patterns that have only optional states) e.g A*
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