Aegeaner commented on issue #1650: The WHERE clause predicate could not be 
applied to the NULL-supplying table.
URL: 
https://github.com/apache/incubator-doris/issues/1650#issuecomment-523377097
 
 
   In Hive, this behavior is just expected: During Join predicates (ON) cannot 
be pushed past Preserved Row tables.
   After Join predicates (WHERE) cannot be pushed past Null Supplying tables.
   
https://cwiki.apache.org/confluence/display/Hive/OuterJoinBehavior#OuterJoinBehavior-PredicatePushdownRules

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