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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