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

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

Rui Wang created CALCITE-4164:
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             Summary: 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


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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