document use case where co-group is better choice than join
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Key: PIG-2423
URL: https://issues.apache.org/jira/browse/PIG-2423
Project: Pig
Issue Type: Improvement
Components: documentation
Reporter: Thejas M Nair
Fix For: 0.10
Optimization rules 2 and 3 suggested in
https://issues.apache.org/jira/secure/attachment/12506841/pig_tpch.ppt
(PIG-2397) recommend the use of co-group instead of join in certain cases.
These should be documented in pig performance page.
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