zabetak commented on a change in pull request #1531:
URL: https://github.com/apache/hive/pull/1531#discussion_r497059455



##########
File path: 
ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java
##########
@@ -2921,6 +2920,77 @@ public Object process(Node nd, Stack<Node> stack, 
NodeProcessorCtx procCtx,
     }
   }
 
+  /**
+   * LateralViewJoinOperator joins the output of select with the output of 
UDTF.

Review comment:
       Could you provide a bit more details about what the rule does? Most of 
the other rules in this class give a general overview of the cost model they 
implement.




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