Alex Bain created PIG-3557:
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Summary: Implement optimizations for LIMIT
Key: PIG-3557
URL: https://issues.apache.org/jira/browse/PIG-3557
Project: Pig
Issue Type: Bug
Components: tez
Affects Versions: tez-branch
Reporter: Alex Bain
Assignee: Alex Bain
Implement optimizations for LIMIT when other parts of Pig-on-Tez are more
mature. Some of the optimizations mentioned by Daniel include:
1. If the previous stage using 1 reduce, no need to add one more vertex
2. If the limitplan is null (ie, not the "limited order by" case), we might not
need a shuffle edge, a pass through edge should be enough if possible
3. Similar to PIG-1270, we can push limit to InputHandler
4. We also need to think through the "limited order by" case once "order by" is
implemented
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