samuelcolvin commented on issue #10180:
URL: https://github.com/apache/datafusion/issues/10180#issuecomment-2074760696

   ye, `return_type_from_exprs` doesn't help.
   
   I got around it mostly, with I think good performance by rewriting the query 
when there's a cast, so:
   
   ```sql
   select * from foo where json_get(attributes, 'bar')::string='ham'
   ```
   Will be rewritten to:
   ```sql
   select * from foo where json_get_str(attributes, 'bar')='ham'
   ```
   
   The main requirement I have now is that the error when you do try to compare 
a union is more helpful and less ugly.


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