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https://issues.apache.org/jira/browse/PIG-1513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12893744#action_12893744
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Richard Ding commented on PIG-1513:
-----------------------------------
Manually ran and passed all core tests.
> Pig doesn't handle empty input directory
> ----------------------------------------
>
> Key: PIG-1513
> URL: https://issues.apache.org/jira/browse/PIG-1513
> Project: Pig
> Issue Type: Bug
> Reporter: Richard Ding
> Assignee: Richard Ding
> Fix For: 0.8.0
>
> Attachments: PIG-1513.patch
>
>
> The following script
> {code}
> A = load 'input';
> B = load 'emptydir';
> C = join B by $0, A by $0 using 'skewed';
> store C into 'output';
> {code}
> fails with "ERROR: java.lang.RuntimeException: Empty samples file';
> In this case, the sample job has 0 maps. Pig doesn't expect this and fails .
> For merge join the script
> The merge join script
> {code}
> A = load 'input';
> B = load 'emptydir';
> C = join A by $0, B by $0 using 'merge';
> store C into 'output';
> {code}
> the sample job again has 0 maps and the script fails with " ERROR 2176:
> Error processing right input during merge join".
> But if we change the join order:
> {code}
> A = load 'input';
> B = load 'emptydir';
> C = join B by $0, A by $0 using 'merge';
> store C into 'output';
> {code}
> The second job (merge) now has 0 maps and 0 reduces. And it generates an
> empty 'output' directory.
> Order by on empty directory works fine and generates empty part files.
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