kangpinghuang opened a new issue #2908: compound or predicate should be push 
down to storage engine
URL: https://github.com/apache/incubator-doris/issues/2908
 
 
   Now, only and compond predicate can be push down to storage engine, which 
will bring performance problems when query like `select * from table_a where 
predicate_a or predicate_b`.
   
   A case like this:
   
![image](https://user-images.githubusercontent.com/40422952/74581104-609a0380-4fe6-11ea-846e-30de7365c982.png)
   
   predicate pushdown can be optimized to support queries like this.

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