kgyrtkirk commented on a change in pull request #1875:
URL: https://github.com/apache/hive/pull/1875#discussion_r559550634



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File path: common/src/java/org/apache/hadoop/hive/conf/HiveConf.java
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@@ -1806,6 +1806,12 @@ private static void 
populateLlapDaemonVarsSet(Set<String> llapDaemonVarsSetLocal
 
     // CBO related
     HIVE_CBO_ENABLED("hive.cbo.enable", true, "Flag to control enabling Cost 
Based Optimizations using Calcite framework."),
+    HIVE_CBO_FALLBACK_STRATEGY("hive.cbo.fallback.strategy", "CONSERVATIVE", 
new StringSet("NEVER, CONSERVATIVE, ALWAYS, TEST"),

Review comment:
       this seem like the stringset has only one value which is `NEVER, 
CONSERVATIVE, ALWAYS, TEST`




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