friendlymatthew opened a new pull request, #22825:
URL: https://github.com/apache/datafusion/pull/22825

   - Closes https://github.com/apache/datafusion/issues/18825
   
   Add a `union_coercion` rule so that comparisons between a Union column and 
an opaque scalar pick the scalar type whenever any union variant can be cast to 
it. The execution side is already handled by arrow-rs's `cast(Union -> T)` 
(arrow 58.3.0+), which extracts values from the matching variant and emits NULL 
for rows whose active variant is not castable to the target
   
   
   


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