jerrypeng opened a new pull request #2414:  allow predicates concerning publish 
time to push down to pulsar
URL: https://github.com/apache/incubator-pulsar/pull/2414
 
 
   ### Motivation
   
   Since we can search through entries via publish time efficiently, we don't 
need to get return all the entries to presto when there is a predicate 
concerning publish time.  As an optimization when can only return the entries 
that satisfy the conditions in the predicate.
   

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