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From "Pavel Fedyakov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PIG-3434) Null subexpression in bincond nullifies outer tuple (or bag)
Date Wed, 21 Aug 2013 13:05:52 GMT
Pavel Fedyakov created PIG-3434:
-----------------------------------

             Summary: Null subexpression in bincond nullifies outer tuple (or bag)
                 Key: PIG-3434
                 URL: https://issues.apache.org/jira/browse/PIG-3434
             Project: Pig
          Issue Type: Bug
            Reporter: Pavel Fedyakov


According to docs, for bincond operator "If a Boolean subexpression results in null value,
the resulting expression is null" (http://pig.apache.org/docs/r0.11.0/basic.html#nulls).

It works as described in plain foreach..generate expression:

{{in = load 'in';}}
{{out = FOREACH in GENERATE 1, ($0 > 0 ? 2 : 3);}}
{{dump out;}}


in (3 lines, 2nd is empty):
{{0}}

{{1}}

out:
{{(1,3)}}
{{(1,)}}
{{(1,2)}}

But if we wrap generated variables in tuple (or bag), we lost the whole 2nd line in output:

{{out = FOREACH in GENERATE (1, ($0 > 0 ? 2 : 3));}}

out:
{{((1,3))}}
{{()}}
{{((1,2))}}


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