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https://issues.apache.org/jira/browse/PIG-4953?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15389780#comment-15389780
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Ryan Blue commented on PIG-4953:
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Thanks for reviewing so quickly!
> 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
> Fix For: 0.17.0
>
> Attachments: PIG-4953.1.patch, PIG-4953.2.patch, PIG-4953.3.patch
>
>
> 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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