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From jianqiao <...@git.apache.org>
Subject [GitHub] incubator-quickstep issue #180: Fix the bug with SingleIdentityHashFilter wh...
Date Sun, 05 Feb 2017 23:05:26 GMT
Github user jianqiao commented on the issue:

    https://github.com/apache/incubator-quickstep/pull/180
  
    Estimated cardinality being zero means that we expect the relation to be empty or have
a small number of tuples. In either case, the created filter is effective and can be used
to pre-filter other relations. Otherwise if we don't create such a filter, then there would
be no optimization at all.


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