Ryan Blue created PIG-4953:
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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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