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https://issues.apache.org/jira/browse/FLINK-19282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17227699#comment-17227699
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godfrey he commented on FLINK-19282:
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master: 2c1e24b53f54486827f767ab3ab5b22abc6fc278
> Support watermark push down with WatermarkStrategy
> --------------------------------------------------
>
> Key: FLINK-19282
> URL: https://issues.apache.org/jira/browse/FLINK-19282
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Reporter: Shengkai Fang
> Priority: Major
> Labels: pull-request-available
>
> Push the {{WatermarkStrategy}} into TableSourceScan in the interface
> {{SupportsWatermarkPushDown}}. Sometimes users define watermark on computed
> column. Therefore, we will push the computed column of rowtime into
> {{WatermarkStrategy}} first. For more info, please take a look at
> [discussion|http://apache-flink-mailing-list-archive.1008284.n3.nabble.com/Merge-SupportsComputedColumnPushDown-and-SupportsWatermarkPushDown-td44387.html].
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