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https://issues.apache.org/jira/browse/CALCITE-4176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17177525#comment-17177525
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Rui Wang commented on CALCITE-4176:
-----------------------------------
cc [~duli] [~liupengcheng]
> Key descriptor can be optional in SESSION table function
> --------------------------------------------------------
>
> Key: CALCITE-4176
> URL: https://issues.apache.org/jira/browse/CALCITE-4176
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: Major
>
> In [1], people mentioned key descriptor might not be required for use cases
> in SESSION table function. For example, the SESSION table function can
> directly be applied on a data from a website. Technically there is still a
> key, but just all data have the same website key.
> There are three options to make key descriptor "optional"
> 1) make key descriptor optional.
> 2) accept empty descriptor.
> 3) descriptor becomes nullable.
> I am planning to try 1) first.
> [1]:
> https://issues.apache.org/jira/browse/CALCITE-3780?focusedCommentId=17166086&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-17166086
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