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https://issues.apache.org/jira/browse/FLINK-19063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17187380#comment-17187380
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Kurt Young commented on FLINK-19063:
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We can probably rely on watermark when doing event time temporal table join,
which will scan the temporal table into state. Things might get a little bit
tricky if we use look up join in such case. Right now there is no watermark
coming from a LookupableTableSource, we may need to find a way to extract
watermark from this kind of source or find another mechanism.
> Support join late event from dimension table side in temporal table join
> -------------------------------------------------------------------------
>
> Key: FLINK-19063
> URL: https://issues.apache.org/jira/browse/FLINK-19063
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / API
> Reporter: Leonard Xu
> Priority: Major
>
> To join late event from dimension table side in temporal table join is a
> common user case
> from user-zh mail list[1][2].
> And another similar user case is how to enable the faster stream to wait the
> slower stream in regular stream join[3].
> I think we can discuss how to support these user cases.
>
>
> [1][http://apache-flink.147419.n8.nabble.com/Flink-join-td6563.html]
> [2][http://apache-flink.147419.n8.nabble.com/flinksql-mysql-td3584.html#a3585]
> [3][http://apache-flink.147419.n8.nabble.com/Flink-sql-td4435.html#a4436]
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