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https://issues.apache.org/jira/browse/CALCITE-3899?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17077411#comment-17077411
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Julian Hyde commented on CALCITE-3899:
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[~Zhixiong Chen] In the summary can you please convert SQL keywords to
upper-case.
[~danny0405] and others, What should be the inferred type of "?"? I don't think
it's possible to infer a type. And if so, isn't this statement illegal? The
validator should throw. (Calcite should not throw ClassCastException at
runtime.)
> cast( string as date ) throw exception in dynamic parameter
> -----------------------------------------------------------
>
> Key: CALCITE-3899
> URL: https://issues.apache.org/jira/browse/CALCITE-3899
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.16.0
> Reporter: Zhixiong Chen
> Priority: Major
>
> sql like::
> SELECT cast( ? as date)
> FROM
> Table group by cast( ? as date)
> the dynamic parameter is string like '2020-04-07'
>
> But it throw exception like java.lang.String cannot be cast to
> java.lang.Integer
> then I find in calcite plan it will cast string as integer and throw exception
> public Object current(){
> return (Integer) root.get("?0");
> }
>
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