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https://issues.apache.org/jira/browse/FLINK-38352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18021403#comment-18021403
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Timo Walther commented on FLINK-38352:
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Improved the forward compatibility a bit in master:
933c9cfacfa8adc43ec94518b494b3607f13d0f7
> Expose timestamp used in DefaultWatermarkGenerator
> --------------------------------------------------
>
> Key: FLINK-38352
> URL: https://issues.apache.org/jira/browse/FLINK-38352
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner, Table SQL / Runtime
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> When implementing an advanced watermark strategy, it is not possible to
> extract the timestamp from DefaultWatermarkGenerator because it is hidden in
> code generation. We should at least provide an internal API to access the
> timestamp for logging/metrics or other calculations.
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