Matt Whipple updated LUCENE-7926:
    Comment: was deleted

(was: This can lead to issues when attempting to modify the tree with such a 
decorator in a node's ancestry. I'll have to circle back to figure out the all 
of the relevant tentacles later.)

> Unsafe type cast in flexible parser QueryNodeImpl
> -------------------------------------------------
>                 Key: LUCENE-7926
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7926
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Matt Whipple
>            Priority: Trivial
>         Attachments: LUCENE-7926.patch
> {{org.apache.lucene.queryparser.flexible.core.nodes.QueryNodeImplL67}} casts 
> the argument to {{QueryNodeImpl}} although the rest of the code is written 
> against the {{QueryNode}} interface.  This blows up in cases where a 
> non-inheriting implementation is passed (such as using a wrapper/decorator 
> class).
> The relevant {{setParent}} method does not exist on the interface, so the 
> most backwards compatible short term fix would be to wrap the cast in a 
> conditional to ensure it is safe (more significant changes to the hierarchy 
> may make sense but this seems like a fairly stable module).
> Patch enclosed...

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