fallintoplace opened a new pull request, #1112:
URL: https://github.com/apache/iceberg-go/pull/1112

   ## Summary
   
   - convert Arrow timestamp partition values according to their Arrow unit 
before applying Iceberg partition transforms
   - use the table source type to choose microsecond vs nanosecond Iceberg 
timestamp literals
   - add partition fanout regression coverage for timestamp seconds, 
milliseconds, microseconds, and nanoseconds
   
   ## Why
   
   Partitioned writes compute partition keys before `ToRequestedSchema` 
normalizes Arrow timestamp arrays to the table schema. The old partition path 
cast raw Arrow timestamp values directly to Iceberg microsecond timestamps, so 
`timestamp[s]` and `timestamp[ms]` inputs could be routed to the wrong day/hour 
partition even though the data values were later written with normalized units.
   
   Fixes #1111.
   
   ## Testing
   
   - `go test ./table -run TestFanoutWriter -count=1`
   - `git diff --check`
   


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