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https://issues.apache.org/jira/browse/CALCITE-3780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17169620#comment-17169620
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Rui Wang commented on CALCITE-3780:
-----------------------------------
[~jmxie]
Thanks. I got the example. Technically there is still a website key there, but
as sounds like there is only data of one single website thus session key is not
required.
I will think of how to address this requirement. There are three options: 1)
reorder arguments to make descriptor be the last argument thus we can make it
optional. 2) accept empty descriptor. 3) descriptor becomes nullable.
> SESSION Table-valued Function
> -----------------------------
>
> Key: CALCITE-3780
> URL: https://issues.apache.org/jira/browse/CALCITE-3780
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
> Fix For: 1.23.0
>
>
> We can create SESSION table-valued function to replace GROUP BY SESSION for
> inactive gap session functionality:
> {code:sql}
> SELECT *
> FROM TABLE SESSION (
> data => TABLE Bid ,
> timecol => DESCRIPTOR ( bidtime ) ,
> keycol => DESCRIPTOR(key),
> inactive_gap => INTERVAL '10' MINUTES )
> {code}
>
>
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