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https://issues.apache.org/jira/browse/PIG-3434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13782219#comment-13782219
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Daniel Dai commented on PIG-3434:
---------------------------------
Looks good. +1.
> 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
> Affects Versions: 0.11
> Reporter: Pavel Fedyakov
> Assignee: Mark Wagner
> Fix For: 0.12.0
>
> Attachments: PIG-3434.1.patch
>
>
> 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:
> {noformat}
> in = load 'in';
> out = FOREACH in GENERATE 1, ($0 > 0 ? 2 : 3);
> dump out;
> {noformat}
> in (3 lines, 2nd is empty):
> {noformat}
> 0
> 1
> {noformat}
> out:
> {noformat}
> (1,3)
> (1,)
> (1,2)
> {noformat}
> But if we wrap generated variables in tuple (or bag), we lose the whole 2nd
> line in output:
> {noformat}
> out = FOREACH in GENERATE (1, ($0 > 0 ? 2 : 3));
> {noformat}
> out:
> {noformat}
> ((1,3))
> ()
> ((1,2))
> {noformat}
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