dongjoon-hyun opened a new pull request, #59163:
URL: https://github.com/apache/spark/pull/59163

   ### What changes were proposed in this pull request?
   
   This PR aims to make `DataSourceV2ScanExecBase.outputOrdering` keep only the 
leading sort orders over output columns when a DSv2 source reports an ordering 
on a column pruned out of the scan output. This is consistent with 
`DataSourceV2ScanRelation.doCanonicalize`.
   
   ### Why are the changes needed?
   
   `V2ScanPartitioningAndOrdering` converts the reported ordering against the 
relation before column pruning, so the ordering can reference pruned columns. A 
row-based scan is safe because its `ProjectExec` truncates such an ordering, 
but a columnar scan can reach the k-way merge of `GroupPartitionsExec` without 
one, and the merge fails.
   
   ```
   [INTERNAL_ERROR_ATTRIBUTE_NOT_FOUND] Could not find ts#11 in [id#9,data#10]. 
SQLSTATE: XX000
   ```
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes, this fixes a query failure when 
`spark.sql.sources.v2.bucketing.preserveOrderingOnCoalesce.enabled` (default: 
`false`, since 4.2.0) is enabled.
   
   ### How was this patch tested?
   
   Pass the CIs with the newly added test case.
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   Generated-by: Claude Opus 5.5


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