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From "Ryan Blue (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-4953) Predicate push-down will not run filters for single unary expressions
Date Tue, 19 Jul 2016 15:45:20 GMT
Ryan Blue created PIG-4953:
------------------------------

             Summary: Predicate push-down will not run filters for single unary expressions
                 Key: PIG-4953
                 URL: https://issues.apache.org/jira/browse/PIG-4953
             Project: Pig
          Issue Type: Bug
          Components: impl
    Affects Versions: 0.15.0
            Reporter: Ryan Blue
            Assignee: Ryan Blue


While testing PIG-4940, I noticed that a "is not null" predicate was not pushed down, but
equality predicates were. The problem is that the {{FilterExtractor#visit}} method ignores
anything that isn't a {{BinaryExpression}}. Pushing down {{UnaryExpression}} filters works
if the expression is linked in by a binary expression, like "b is not null and c == 'val'".



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