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https://issues.apache.org/jira/browse/CALCITE-4580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17322403#comment-17322403
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Konstantin Orlov commented on CALCITE-4580:
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bq. we require that you create a {{SqlOperator}} instance ... and bind it to a 
... {{SqlCall}}

This was unclear to me. Thanks for clarification!

bq. Hey, look: public List<Pair<SqlIdentifier, SqlNode>> 
SqlCreateForeignSchema.options().

It is the approach #1. Sure this would work, but, personally, I prefer to have 
a separate AST node with meaningful name.

> Change the visibility for SqlNode constructor
> ---------------------------------------------
>
>                 Key: CALCITE-4580
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4580
>             Project: Calcite
>          Issue Type: Task
>            Reporter: Konstantin Orlov
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Currently the constructor is package private. That forces developers 
> extending the parser to put all custom nodes under {{org.apache.calcite.sql}} 
> package (or at least create one abstract node {{MySqlNode}} extending 
> {{SqlNode}} and exposing the constructor). It would nice to have the 
> constructor exposed by {{SqlNode}} itself.



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