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https://issues.apache.org/jira/browse/PIG-2915?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453649#comment-13453649
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Dmitriy V. Ryaboy commented on PIG-2915:
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+1 will commit to trunk.
> Builtin TOP udf is sensitive to null input bags
> -----------------------------------------------
>
> Key: PIG-2915
> URL: https://issues.apache.org/jira/browse/PIG-2915
> Project: Pig
> Issue Type: Improvement
> Components: internal-udfs
> Affects Versions: 0.11
> Reporter: Andy Schlaikjer
> Assignee: Andy Schlaikjer
> Attachments: pig-null_safe_top.1.patch, pig-null_safe_top.2.patch
>
>
> TOP(max, sortField, inputBag) is sensitive to null inputBag arguments.
> In some cases it is preferable for a UDF to simply return null for null
> inputs e.g. to avoid conditional logic in a script.
> Most of the UDFs I write act this way, but TOP does not. This patch updates
> TOP to return null in the case where all input bags are null. Unit tests are
> included to confirm expected behavior.
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