deniskuzZ commented on code in PR #5423:
URL: https://github.com/apache/hive/pull/5423#discussion_r1826560777


##########
ql/src/test/queries/clientpositive/explainuser_2.q:
##########
@@ -6,6 +6,7 @@ set hive.strict.checks.bucketing=false;
 set hive.explain.user=true;
 set hive.metastore.aggregate.stats.cache.enabled=false;
 set hive.cbo.fallback.strategy=NEVER;
+set hive.optimize.merge.adjacent.union.distinct=false;

Review Comment:
   hi @okumin, I've asked to keep the existing qtests unchanged as a regression 
when this feature is disabled + there is a new qtest added specifically to 
validate new feature. 
   Note, you could check the outputs for those 2 qtests with enabled 
optimization in 
https://github.com/apache/hive/pull/5423/commits/74178b15f72bb8d53ea7b5fb934103c296f6c754#diff-f40b3c8ff967ea71b2e610dc10d9ed9a749f1054ad0d7144a3326f1b5820eb3f



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