Re: [I] Segment-based partitioning [airflow]

["Lee-W (via GitHub)" <gi...@apache.org>]

Lee-W commented on issue #57695:
URL: https://github.com/apache/airflow/issues/57695#issuecomment-4312322143

   ```python
   from airflow.sdk import Asset, AllowedKeyMapper, PartitionAtRuntime, asset
   
   region_raw_stats = Asset(
       uri="file://incoming/player-stats/by-region.csv",
       name="region_raw_stats",
   )
   
   # Must be a module-level function so the timetable is serialisable:
   # the scheduler stores its dotted path and re-imports at scheduling time.
   # Lambdas, closures, and bound methods are rejected at construction.
   def list_active_regions() -> list[str]:
       ...
   
   @asset(
       uri="file://analytics/player-stats/regional-breakdown.csv",
       schedule=PartitionAtRuntime(
           assets=region_raw_stats,
           default_partition_mapper=AllowedKeyMapper(list_active_regions),
       ),
   )
   def regional_stats_breakdown():
       ...
   ```
   
   This could be how it works, but will affect #44146 implemented


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