gene-bordegaray commented on code in PR #18673:
URL: https://github.com/apache/datafusion/pull/18673#discussion_r2528112110


##########
datafusion/core/tests/physical_optimizer/enforce_distribution.rs:
##########
@@ -1424,19 +1424,19 @@ fn multi_smj_joins() -> Result<()> {
                     // Should include 6 RepartitionExecs (3 hash, 3 
round-robin), 3 SortExecs
                     JoinType::Inner | JoinType::Left | JoinType::LeftSemi | 
JoinType::LeftAnti => {
                         assert_plan!(plan_distrib, @r"
-SortMergeJoin: join_type=..., on=[(a@0, c@2)]
-  SortMergeJoin: join_type=..., on=[(a@0, b1@1)]
-    SortExec: expr=[a@0 ASC], preserve_partitioning=[true]
-      RepartitionExec: partitioning=Hash([a@0], 10), input_partitions=1
-        DataSourceExec: file_groups={1 group: [[x]]}, projection=[a, b, c, d, 
e], file_type=parquet
-    SortExec: expr=[b1@1 ASC], preserve_partitioning=[true]
-      RepartitionExec: partitioning=Hash([b1@1], 10), input_partitions=1
-        ProjectionExec: expr=[a@0 as a1, b@1 as b1, c@2 as c1, d@3 as d1, e@4 
as e1]
-          DataSourceExec: file_groups={1 group: [[x]]}, projection=[a, b, c, 
d, e], file_type=parquet
-  SortExec: expr=[c@2 ASC], preserve_partitioning=[true]
-    RepartitionExec: partitioning=Hash([c@2], 10), input_partitions=1
-      DataSourceExec: file_groups={1 group: [[x]]}, projection=[a, b, c, d, 
e], file_type=parquet
-");
+                        SortMergeJoin: join_type=..., on=[(a@0, c@2)]
+                          SortMergeJoin: join_type=..., on=[(a@0, b1@1)]
+                            SortExec: expr=[a@0 ASC], 
preserve_partitioning=[true]
+                              RepartitionExec: partitioning=Hash([a@0], 10), 
input_partitions=1, maintains_sort_order=true
+                                DataSourceExec: file_groups={1 group: [[x]]}, 
projection=[a, b, c, d, e], file_type=parquet
+                            SortExec: expr=[b1@1 ASC], 
preserve_partitioning=[true]
+                              RepartitionExec: partitioning=Hash([b1@1], 10), 
input_partitions=1, maintains_sort_order=true

Review Comment:
   I think a good alternative would be to change the preserve_order to 
something like maintain_input_order which does not imply that the data is 
sorted. 



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