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Posted to issues@calcite.apache.org by "Julian Hyde (Jira)" <ji...@apache.org> on 2019/08/21 06:05:00 UTC

[jira] [Commented] (CALCITE-3271) TVF windowing and EMIT syntax support in Calcite

    [ https://issues.apache.org/jira/browse/CALCITE-3271?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16911973#comment-16911973 ] 

Julian Hyde commented on CALCITE-3271:
--------------------------------------

"TVF" is jargon, and non-standard jargon at that. (I had to look it up, and I co-authored the paper.) Please expand/clarify.

> TVF windowing and EMIT syntax support in Calcite
> ------------------------------------------------
>
>                 Key: CALCITE-3271
>                 URL: https://issues.apache.org/jira/browse/CALCITE-3271
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.20.0
>            Reporter: Danny Chan
>            Assignee: Danny Chan
>            Priority: Major
>
> Copied from the mailing list:
> Calcite has not implemented the syntax in that paper. I would support an effort to add it (unsurprising, since I am a co-author of that paper).
> EMIT STREAM is equivalent to the current SELECT STREAM syntax.
> There is no equivalent in current Calcite of the EMIT AFTER WATERMARK, or EMIT STREAM AFTER DELAY.
> HOP, TUMBLE and SESSION are supported in Calcite’s SQL parser, but following the paper would be replaced with a table function call. We could need to add HOP, TUMBLE and SESSION table functions. We would also need to make the system aware of how watermarks flow through these table functions (an area that the paper does not go into).
> Julian



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