[jira] [Updated] (FLINK-19878) Improve watermark for upsertSource

["Leonard Xu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-19878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Leonard Xu updated FLINK-19878:
-------------------------------
    Summary: Improve watermark  for upsertSource  (was: Improve watermark ChangelogNormalize for upsertSource)

> Improve watermark  for upsertSource
> -----------------------------------
>
>                 Key: FLINK-19878
>                 URL: https://issues.apache.org/jira/browse/FLINK-19878
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / Planner
>            Reporter: Leonard Xu
>            Priority: Major
>
> Cutrrently, for a upsertSource like upsert-kafka, the WatermarkAssigner is followed after ChangelogNormalize Node,  it may returns Long.MaxValue as watermark if some parallelism doesn't have data. 
> As an improvement, we can move the WatermarkAssigner to be after the SourceCan Node and thus the watermark will produce like general Source.
>  
> {code:java}
>    +- Exchange(distribution=[hash[currency]], changelogMode=[I,UA,D])
>       +- WatermarkAssigner(rowtime=[rowtime], watermark=[rowtime], changelogMode=[I,UA,D])
>          +- ChangelogNormalize(key=[currency], changelogMode=[I,UA,D])
>             +- Exchange(distribution=[hash[currency]], changelogMode=[UA,D])
>                +- TableSourceScan(table=[[default_catalog, default_database, rates_history]], fields=[currency, rate, rowtime], changelogMode=[UA,D])
> {code}



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