[jira] [Commented] (CALCITE-4164) Create a Spec doc for EMIT syntax

["Rui Wang (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-4164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17172561#comment-17172561 ] 

Rui Wang commented on CALCITE-4164:
-----------------------------------

This JIRA blocks other implementation tasks.

> Create a Spec doc for EMIT syntax
> ---------------------------------
>
>                 Key: CALCITE-4164
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4164
>             Project: Calcite
>          Issue Type: Sub-task
>            Reporter: Rui Wang
>            Assignee: Rui Wang
>            Priority: Major
>
> Basically have a spec doc to introduce EMIT from SQL language/relation algebra perspective. This is very important because EMIT syntax is non-standard (maybe not yet) so it becomes an extension that Calcite introduces.  
> The format might be as strict and detailed as what SQL standard does, but at least in should include:
> 1. new SQL syntax
> 2. new SQL keywords
> 3. The scope of EMIT clause (might not be needed as we won't allow column appear in EMIT clause)
> 4. All EMIT strategies
> 5. How does EMIT strategies propagate through the plan.
> For 5 my current thought it is EMIT will just affect FROM clause. For non-stream case it just means data emit all at once (e.g. EMIT AFTER WATERMARK).



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