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https://issues.apache.org/jira/browse/CALCITE-2033?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240131#comment-16240131
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Zhiqiang He commented on CALCITE-2033:
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{A->B+} is equals {A B+}. why we need to add this operator in regulax
expression?
> Support followed by in pattern definition for MATCH_RECOGNIZE
> -------------------------------------------------------------
>
> Key: CALCITE-2033
> URL: https://issues.apache.org/jira/browse/CALCITE-2033
> Project: Calcite
> Issue Type: Bug
> Reporter: Dian Fu
> Assignee: Julian Hyde
>
> The [doc|https://docs.oracle.com/database/121/DWHSG/pattern.htm#DWHSG8986]
> has already defined pattern operator {{Concatenation}}. For example, pattern
> {{A B}} means that events matching pattern {{A}} and {{B}} should occur
> successively. There are also many use cases which require patterns to match
> events which not occur successively.
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