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https://issues.apache.org/jira/browse/CALCITE-4410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17237640#comment-17237640
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Julian Hyde commented on CALCITE-4410:
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{quote}However, {{Planner}} interface does not extends {{Validator}} interface.
So it looks not quite fit for this use case.
{quote}
Wrapper is often used to expose embedded objects.
{quote}Only a small concern is that whether users will get confused
{quote}
That can be mitigated with good javadoc.
> Expose the type of internal sql node in Planner
> -----------------------------------------------
>
> Key: CALCITE-4410
> URL: https://issues.apache.org/jira/browse/CALCITE-4410
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.26.0
> Reporter: Will Yu
> Assignee: Will Yu
> Priority: Minor
>
> Currently in Planner interface, there is only possible to fetch the
> *RelDataType* of the whole SqlNode through *validateAndGetType*, but really
> hard to fetch the type of one component in the SqlNode, e.g. one of the
> statement in the select list.
> Currently, we worked it around by duplicate some code in Calcite, which is
> not a good practice. It would be helpful to directly expose the
> *SqlValidator::getValidatedNodeType* through Planner.
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