rkrishn7 commented on code in PR #15242:
URL: https://github.com/apache/datafusion/pull/15242#discussion_r2011223823


##########
datafusion/sqllogictest/test_files/union_by_name.slt:
##########
@@ -152,22 +152,22 @@ NULL 4
 # Limit
 
 query III
-SELECT 1 UNION BY NAME SELECT * FROM unnest(range(2, 100)) UNION BY NAME 
SELECT 999 ORDER BY 3, 1 LIMIT 5;
+SELECT 1 UNION BY NAME SELECT * FROM unnest(range(2, 100)) UNION BY NAME 
SELECT 999 ORDER BY 3, 1, 2 LIMIT 5;
 ----
-NULL NULL 2
-NULL NULL 3
-NULL NULL 4
-NULL NULL 5
-NULL NULL 6
+NULL NULL 999
+1 NULL NULL
+NULL 2 NULL
+NULL 3 NULL
+NULL 4 NULL
 
 query III
 SELECT 1 UNION ALL BY NAME SELECT * FROM unnest(range(2, 100)) UNION ALL BY 
NAME SELECT 999 ORDER BY 3, 1 LIMIT 5;
 ----
-NULL NULL 2
-NULL NULL 3
-NULL NULL 4
-NULL NULL 5
-NULL NULL 6
+NULL NULL 999

Review Comment:
   Same here - result set is changing due to column reordering. Also verified 
result is consistent with duckdb's.



##########
datafusion/sqllogictest/test_files/union_by_name.slt:
##########
@@ -152,22 +152,22 @@ NULL 4
 # Limit
 
 query III
-SELECT 1 UNION BY NAME SELECT * FROM unnest(range(2, 100)) UNION BY NAME 
SELECT 999 ORDER BY 3, 1 LIMIT 5;
+SELECT 1 UNION BY NAME SELECT * FROM unnest(range(2, 100)) UNION BY NAME 
SELECT 999 ORDER BY 3, 1, 2 LIMIT 5;

Review Comment:
   Previously the unnest column was incorrectly #3. Now it is correctly #2 so 
the result here has changed.
   
   The extra ordering is to order the unnest values for a deterministic result.
   
   Also verified result is consistent with duckdb's.



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