okumin commented on code in PR #5452:
URL: https://github.com/apache/hive/pull/5452#discussion_r1804668198


##########
common/src/java/org/apache/hadoop/hive/conf/HiveConf.java:
##########
@@ -809,6 +809,10 @@ public static enum ConfVars {
     HIVE_IN_TEST_REPL("hive.in.repl.test", false, "internal usage only, true 
in replication test mode", true),
     HIVE_IN_TEST_IDE("hive.in.ide.test", false, "internal usage only, true if 
test running in ide",
         true),
+    
HIVE_IN_TEST_PLANMAPPER_STRICT_VALIDATION("hive.in.test.planmapper.strict.validation",
 false,
+        "internal use only, whether to raise an error when unexpected links 
are found. We ignore equivalence mapping "
+        + "violation because it introduces only minor problems. But we want to 
strictly check it in qtest so that we "
+        + "can prevent further degradations"),

Review Comment:
   Thanks. Let's say our qtest covers 99.9% of use cases of Hive(I trust the 
coverage 😃 ), which means 0.1% are uncovered. I assume we agreed that it is too 
costly to achieve 100% promptly.
   I personally thought it'd be more reasonable to use CI if we wanted to keep 
the stability high enough, e.g. 90%. I'm a bit pessimistic here and I'm going 
to remove this property.



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