EmmyMiao87 commented on issue #1650: Where clause can't push down into the 
right table of JOIN clasure
URL: 
https://github.com/apache/incubator-doris/issues/1650#issuecomment-521565573
 
 
   This 
https://www.ibm.com/developerworks/data/library/techarticle/purcell/0201purcell.html
 provides a theoretical support for a WHERE clause predicate applied to the 
NULL-supplying table.

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