coderfender opened a new issue, #20554:
URL: https://github.com/apache/datafusion/issues/20554
### Is your feature request related to a problem or challenge?
DF's int to timestamp cast just reinterprets the nit to timestamp.
DataFusion: int value = timestamp value in target unit (microseconds)
Spark: int value = seconds since epoch, then converted to target unit
Example : casting 100 to TimestampMicrosecond:
- DataFusion -> 100 microseconds (0.0001 seconds)
- Spark -> 100 seconds = 100,000,000 microseconds
### Describe the solution you'd like
Implement new spark compatible cast ScalarUDF and port the existing code
from comet back to spark-expr crate
### Describe alternatives you've considered
_No response_
### Additional context
_No response_
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