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https://issues.apache.org/jira/browse/CALCITE-2270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17096990#comment-17096990
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Julian Hyde commented on CALCITE-2270:
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Can you add more details how you would support polymorphic table functions? Is
the return type defined using some rule based on the types of the input
columns? In Calcite we have many functions where the return type is defined
using code (e.g. {{SqlOperator.inferReturnType}}); it is more powerful,
requires Java code rather than SQL, but is probably less effort to implement
than a rule-derived return type.
> [SQL:2016] Polymorphic table functions
> --------------------------------------
>
> Key: CALCITE-2270
> URL: https://issues.apache.org/jira/browse/CALCITE-2270
> Project: Calcite
> Issue Type: Bug
> Reporter: Chunhui Shi
> Assignee: Rui Wang
> Priority: Major
>
> Polymorphic table functions: table functions without predefined return type
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