Omega359 commented on issue #14884:
URL: https://github.com/apache/datafusion/issues/14884#issuecomment-2686313231

   I went looking for a system where null input would return an empty string an 
came up blank. I am fairly certain spark would return null, and the equiv 
function in duckdb returns null
   ```
   D  select strftime(null::timestamp, '%Y-%m-%d %H:%M:%S');
   ┌────────────────────────────────────────────────────────┐
   │ strftime(CAST(NULL AS TIMESTAMP), '%Y-%m-%d %H:%M:%S') │
   │                        varchar                         │
   ├────────────────────────────────────────────────────────┤
   │ NULL                                                   │
   └────────────────────────────────────────────────────────┘
   ```


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