comparison operation 'null == null' should evaluate to null
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Key: PIG-1930
URL: https://issues.apache.org/jira/browse/PIG-1930
Project: Pig
Issue Type: Bug
Affects Versions: 0.8.0, 0.9.0
Reporter: Thejas M Nair
Fix For: 0.9.0
The expression 'null == null' evaluates to true, it should get evaluated as
null.
ie the filter condition 'fil = filter inp by null == null;' allows all the
records through.
It seems to be a problem only with null literal, expressions that evaluate to
null don't seem to have a problem.
ie 'nullcol1 == nullcol2' (where nullcol1, nullcol2 are columns with null
value), and (1 + null == 1 + null) work correctly .
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