vaibhawvipul commented on issue #10206:
URL: https://github.com/apache/datafusion/issues/10206#issuecomment-2076842125

   My 
   
   > As I mentioned here [#7845 
(comment)](https://github.com/apache/datafusion/issues/7845#issuecomment-2073675288),
 the most useful thing for me would be less ugly errors when you do try to 
compare a union with something else.
   > 
   > Also it would be good to be able to force people to cast unions in my 
case, so it would be nice if we could switch off `comparison_coercion` somehow.
   > 
   > @vaibhawvipul if you're working on this, you might be interested in my 
logic in 
[`datafusion-contrib/datafusion-functions-json/src/common_union.rs`](https://github.com/datafusion-contrib/datafusion-functions-json/blob/main/src/common_union.rs)
   
   This was helpful @samuelcolvin. Thank you.
   
   My approach is similar - 
   - adding support for arrow union datatype
   - need to support cast 
   - will be extending functions to have union functions like `union_extract`.


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