Pavel Fedyakov created PIG-3434:
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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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