Support `Union` as a function about arrow-datafusion HOT 4 OPEN

I would like to work on this.

from arrow-datafusion.

As I mentioned here #7845 (comment), 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

from arrow-datafusion.

As I mentioned here #7845 (comment), 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

This was helpful @samuelcolvin. Thank you.

My approach is similar -

• adding support for arrow union datatype
• update planner
• need to support cast
• will be extending functions to have union functions like union_extract.

from arrow-datafusion.

take

from arrow-datafusion.