[jira] [Resolved] (PIG-4953) Predicate push-down will not run filters for single unary expressions

["Daniel Dai (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PIG-4953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Daniel Dai resolved PIG-4953.
-----------------------------
      Resolution: Fixed
    Hadoop Flags: Reviewed

> 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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