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https://issues.apache.org/jira/browse/CALCITE-4410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17237241#comment-17237241
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Stamatis Zampetakis commented on CALCITE-4410:
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I like both ideas outlined by [~julianhyde].
I would also consider the idea of making one implementation of the
{{SqlValidator}} interface public. Validator is a core component of the
planning phase and it makes sense to have an implementation that can be easily
instantiated by the clients; possibly something similar to
{{RelBuilder#create}}, {{SqlParser#create}}. Currently there is
{{SqlValidatorUtil#newValidator}} but I think we should have a factory in the
class itself.
> 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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