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https://issues.apache.org/jira/browse/FLINK-33546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17787181#comment-17787181
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Dawid Wysakowicz commented on FLINK-33546:
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[~jackylau]
We can not cover it 100% in the API. In the type inference we check types not
expression kinds. We could check for literals, but we could not check e.g. for
function calls. We could add a weaker restriction and prohibit literals, but
from the logical point of view, I don't think there is anything that would make
us do that. I would not introduce that limitation at that level.
> Implement type inference for order(asc/desc) function
> -----------------------------------------------------
>
> Key: FLINK-33546
> URL: https://issues.apache.org/jira/browse/FLINK-33546
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Planner
> Affects Versions: 1.19.0
> Reporter: Jacky Lau
> Assignee: Dawid Wysakowicz
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.19.0
>
>
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