Nick White created PIG-3124:
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Summary: Push FLATTENs After FILTERs If Possible
Key: PIG-3124
URL: https://issues.apache.org/jira/browse/PIG-3124
Project: Pig
Issue Type: Improvement
Components: impl
Affects Versions: 0.10.0
Reporter: Nick White
Assignee: Nick White
Fix For: 0.12
When optimizing a logical plan, it's safe to push a FLATTEN after a FILTER if
the columns being flattened don't occur in the expression that the filter is
being done on. When the FILTER comes first the FLATTEN generates fewer rows
(usually), and so is more efficient.
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