JOIN and cogroup should handle NULLs correctly
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Key: PIG-361
URL: https://issues.apache.org/jira/browse/PIG-361
Project: Pig
Issue Type: Sub-task
Affects Versions: types_branch
Reporter: Pradeep Kamath
Fix For: types_branch
JOIN should follow SQL semantics .i.e if the join key is a null or part of the
join key is null in the first table, it should not join with similar keys in
the second table.
Cogroup should coalesce all NULL key rows into one group.
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