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https://issues.apache.org/jira/browse/CALCITE-4171?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17178641#comment-17178641
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Julian Hyde commented on CALCITE-4171:
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There is already an API that determines whether parameters are required:
{{SqlOperandTypeChecker.isOptional(int)}}. I think we should use that, rather
than adding {{SqlOperator.paramFallBackAsDefault}}. It may mean that we have to
use a {{SqlOperandTypeChecker}} rather than sub-classing a {{SqlFunction}}, but
that is a better way to go for non-trivial functions.
> Support named parameters for table window functions
> ---------------------------------------------------
>
> Key: CALCITE-4171
> URL: https://issues.apache.org/jira/browse/CALCITE-4171
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.23.0, 1.24.0
> Reporter: Danny Chen
> Assignee: Danny Chen
> Priority: Major
> Labels: pull-request-available
> Time Spent: 3h 50m
> Remaining Estimate: 0h
>
> Supports window functions like named params style:
> {code:sql}
> select *
> from table(
> session(
> data => table Shipments,
> timecol => descriptor(rowtime),
> key => descriptor(orderId),
> size => INTERVAL '10' MINUTE))
> {code}
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