neilconway commented on code in PR #22444:
URL: https://github.com/apache/datafusion/pull/22444#discussion_r3292792583


##########
datafusion/sqllogictest/test_files/eliminate_outer_join.slt:
##########
@@ -370,6 +370,25 @@ select * from t1 left join t2 on t1.a = t2.x where (t2.y > 
150) is unknown;
 3 30 c NULL NULL NULL
 NULL 40 d NULL NULL NULL
 
+# LEFT JOIN + WHERE NOT ((t2.y > 150) IS TRUE) -> stays LEFT JOIN

Review Comment:
   Good idea! Added additional SLT tests.



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