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From gatorsmile <>
Subject [GitHub] spark issue #14580: [SPARK-16991][SQL] Fix `EliminateOuterJoin` optimizer to...
Date Thu, 11 Aug 2016 04:38:58 GMT
Github user gatorsmile commented on the issue:
    Not sure which RDBMS are supporting `Using Outer Join`. `NULL` generated by outer joins
are removed. This sounds a little bit strange. After all, `NULL` also has a meaning. 
    In the plan (by EXPLAIN), it is not easy to know this is a regular outer join or using
outer join. That is why I think we should introduce a new join type. At least, users can easily
know they are triggering using outer join.  

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