imay opened a new issue #1261: eliminate predicate which is pushed to storage 
engine
URL: https://github.com/apache/incubator-doris/issues/1261
 
 
   Currently, although we push down predicates to StorageEngine, but we do it 
in OlapScanner again. This is a waste for query which will read too many rows 
from Engine.
   
   we should reduce this eval operation, which need us to eliminate the 
predicates which can be done in Storage Engine. 
   
   It is difficult that we has normalize user predicates, and there is no 
relation between user predicates and Storage filter. 

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