UBarney commented on issue #15818:
URL: https://github.com/apache/datafusion/issues/15818#issuecomment-2822958433
There's no `SortExec` in the query plan. Maybe it was removed by the
optimizer?
>
```
query TT
explain select sum(a) from (select a from t order by a) group by a;
----
logical_plan
01)Projection: sum(t.a)
02)--Aggregate: groupBy=[[t.a]], aggr=[[sum(CAST(t.a AS Int64))]]
03)----TableScan: t projection=[a]
physical_plan
01)ProjectionExec: expr=[sum(t.a)@1 as sum(t.a)]
02)--AggregateExec: mode=FinalPartitioned, gby=[a@0 as a], aggr=[sum(t.a)]
03)----CoalesceBatchesExec: target_batch_size=8192
04)------RepartitionExec: partitioning=Hash([a@0], 4), input_partitions=4
05)--------RepartitionExec: partitioning=RoundRobinBatch(4),
input_partitions=1
06)----------AggregateExec: mode=Partial, gby=[a@0 as a], aggr=[sum(t.a)]
07)------------DataSourceExec: partitions=1, partition_sizes=[1]
```
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