gene-bordegaray commented on code in PR #18919:
URL: https://github.com/apache/datafusion/pull/18919#discussion_r2563386411


##########
datafusion/sqllogictest/test_files/agg_func_substitute.slt:
##########
@@ -44,13 +44,11 @@ logical_plan
 03)----TableScan: multiple_ordered_table projection=[a, c]
 physical_plan
 01)ProjectionExec: expr=[a@0 as a, 
nth_value(multiple_ordered_table.c,Int64(1)) ORDER BY [multiple_ordered_table.c 
ASC NULLS LAST]@1 as result]
-02)--AggregateExec: mode=FinalPartitioned, gby=[a@0 as a], 
aggr=[nth_value(multiple_ordered_table.c,Int64(1)) ORDER BY 
[multiple_ordered_table.c ASC NULLS LAST]], ordering_mode=Sorted
-03)----SortExec: expr=[a@0 ASC NULLS LAST], preserve_partitioning=[true]
-04)------CoalesceBatchesExec: target_batch_size=8192
-05)--------RepartitionExec: partitioning=Hash([a@0], 4), input_partitions=4

Review Comment:
   Eoliminates this hash because it would break ordering guarantees



##########
datafusion/sqllogictest/test_files/agg_func_substitute.slt:
##########
@@ -44,13 +44,11 @@ logical_plan
 03)----TableScan: multiple_ordered_table projection=[a, c]
 physical_plan
 01)ProjectionExec: expr=[a@0 as a, 
nth_value(multiple_ordered_table.c,Int64(1)) ORDER BY [multiple_ordered_table.c 
ASC NULLS LAST]@1 as result]
-02)--AggregateExec: mode=FinalPartitioned, gby=[a@0 as a], 
aggr=[nth_value(multiple_ordered_table.c,Int64(1)) ORDER BY 
[multiple_ordered_table.c ASC NULLS LAST]], ordering_mode=Sorted
-03)----SortExec: expr=[a@0 ASC NULLS LAST], preserve_partitioning=[true]
-04)------CoalesceBatchesExec: target_batch_size=8192
-05)--------RepartitionExec: partitioning=Hash([a@0], 4), input_partitions=4

Review Comment:
   Eliminates this hash because it would break ordering guarantees



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