comphead commented on issue #8790:
URL: 
https://github.com/apache/arrow-datafusion/issues/8790#issuecomment-1934919408

   Adding concise test 
   
   ```
   ❯ select arrow_typeof(coalesce(cast(null as timestamp), cast(null as 
timestamp)));
   +-----------------------------------+
   | arrow_typeof(coalesce(NULL,NULL)) |
   +-----------------------------------+
   | Utf8                              |
   +-----------------------------------+
   1 row in set. Query took 0.002 seconds.
   ```


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