dqkqd commented on issue #16678:
URL: https://github.com/apache/datafusion/issues/16678#issuecomment-3417512617

   @Jefffrey 
   
   I have checked. There is no test for `to_timestamp` with vectorized input.
   
   However, after looking closely at the #16639 and the test, I found that 
`to_timestamp(double)` and `cast(double as timestamp)` return different results.
   
   ```
   datafusion/sqllogictest/test_files/timestamps.slt:504
   
   query PPP
   SELECT to_timestamp(1.1) as c1, cast(1.1 as timestamp) as c2, 1.1::timestamp 
as c3;
   ----
   1970-01-01T00:00:01.100 1970-01-01T00:00:00.000000001 
1970-01-01T00:00:00.000000001
   ```
   
   From https://github.com/apache/datafusion/pull/16639/files#r2213084931, I 
think what we want is to have `to_timestamp(double)` return something like this:
   ```
   > SELECT to_timestamp(1.1);
   +-------------------------------+
   | to_timestamp(Float64(1.1))    |
   +-------------------------------+
   | 1970-01-01T00:00:00.000000001 |
   +-------------------------------+
   ```


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