kosiew commented on code in PR #22444:
URL: https://github.com/apache/datafusion/pull/22444#discussion_r3292535719


##########
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:
   Nice addition to the SLT coverage. Right now the end-to-end regression only 
exercises `NOT ((...) IS TRUE)`. The optimizer unit tests also cover `NOT IS 
FALSE` and `NOT IS NOT UNKNOWN`, and those seem worth checking through SQL 
execution as well.
   
   Would you consider adding matching SLT cases for those two forms too? That 
would help verify both the optimized plan shape and the returned LEFT-padded 
rows for the full set of SQL-visible variants.



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