findepi opened a new issue, #16678:
URL: https://github.com/apache/datafusion/issues/16678

   ### Describe the bug
   
   We have this in SLT tests
   
   ```
   query PPP
   SELECT to_timestamp(1.1) as c1, ...
   ----
   1970-01-01T00:00:01.100 ...
   ```
   
   and indeed it works in CLI
   
   ```
   > SELECT to_timestamp(1.1);
   +----------------------------+
   | to_timestamp(Float64(1.1)) |
   +----------------------------+
   | 1970-01-01T00:00:01.100    |
   +----------------------------+
   ```
   
   unless the value is not result of constant folding
   
   ```
   > SELECT to_timestamp(x) FROM (VALUES (1.1), (NULL)) t(x);
   +-------------------------------+
   | to_timestamp(t.x)             |
   +-------------------------------+
   | 1970-01-01T00:00:00.000000001 |
   | NULL                          |
   +-------------------------------+
   ```
   
   
   ### To Reproduce
   
   _No response_
   
   ### Expected behavior
   
   Same result
   
   ### Additional context
   
   - https://github.com/apache/datafusion/issues/16636
   - https://github.com/apache/datafusion/issues/16531
   - https://github.com/apache/datafusion/issues/13351


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