I do agree with Ron Liu.
This would definitely need a FLIP as it would impact SQL and extend it with the 
equivalent of TimestampAssigners in the Java API.

Is there any existing JIRA here, or is anybody willing to drive a FLIP?
On Feb 26, 2024 at 02:36 +0100, Ron liu <ron9....@gmail.com>, wrote:
> +1,
> But I think this should be a more general requirement, that is, support for
> declaring watermarks in query, which can be declared for any type of
> source, such as table, view. Similar to databricks provided [1], this needs
> a FLIP.
>
> [1]
> https://docs.databricks.com/en/sql/language-manual/sql-ref-syntax-qry-select-watermark.html
>
> Best,
> Ron

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