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https://issues.apache.org/jira/browse/FLINK-10188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young closed FLINK-10188.
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Resolution: Unresolved
> Solve nondeterministic functions problem for retraction
> -------------------------------------------------------
>
> Key: FLINK-10188
> URL: https://issues.apache.org/jira/browse/FLINK-10188
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Hequn Cheng
> Priority: Major
>
> Discussion on the [mailing
> list|http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/How-does-flink-know-which-data-is-modified-in-dynamic-table-td22432.html].
>
> Currently, Retraction has not considered non-deterministic functions. For sql
> like:
> {code:java}
> source -> group by ->
> non-window join -> retract_sink
> source -> group by ->
> {code}
> The group by will send retract messages to join. However, if we add
> LOCALTIMESTAMP between group by and join, messages can not be retracted
> correctly in join, since join retract messages according to the whole row.
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