[GitHub] [arrow-datafusion] xudong963 commented on issue #1192: `-` (negation) with NULL literals does not work: can't be evaluated because the expression's type is Utf8, not signed

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xudong963 commented on issue #1192:
URL: https://github.com/apache/arrow-datafusion/issues/1192#issuecomment-1093939951

   I tested `select -null;` in mysql and postgres: mysql returned null but
   ```sql
   postgres=# select -null;
   ERROR:  operator is not unique: - unknown
   LINE 1: select -null;
                  ^
   HINT:  Could not choose a best candidate operator. You might need to add explicit type casts.
   ```
   Do you need this syntax in iox? @alamb 


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