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From "Dian Fu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7479) Support to retrieve the past event by an offset
Date Fri, 18 Aug 2017 14:15:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7479?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16133007#comment-16133007

Dian Fu commented on FLINK-7479:

This is to support the {{PREV}} clause in {{MATCH_RECOGNIZE}}. As described in the [doc|https://docs.oracle.com/database/121/DWHSG/pattern.htm#DWHSG8996],
{{PREV}} defines an expression using a previous row by physical offset. This means that in
the {{filter}} method of {{IterativeCondition}}, we may also need to access the past events
by physical offset and the accessed events may be not matched by any pattern.

> Support to retrieve the past event by an offset 
> ------------------------------------------------
>                 Key: FLINK-7479
>                 URL: https://issues.apache.org/jira/browse/FLINK-7479
>             Project: Flink
>          Issue Type: Sub-task
>          Components: CEP, Table API & SQL
>            Reporter: Dian Fu
>            Assignee: Dian Fu
> Currently, it's already able to retrieve events matched to the specifed pattern in {{IterativeCondition.Context}}.
While there are also requirements to retrieve events by an physical offset. The retrieved
events may not be matched to any pattern.

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