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https://issues.apache.org/jira/browse/PIG-2031?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028810#comment-13028810
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Dmitriy V. Ryaboy commented on PIG-2031:
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Patch seems fine, thanks for doing that.
A new test that tries the null bag would be good.
> NPE in TOP
> ----------
>
> Key: PIG-2031
> URL: https://issues.apache.org/jira/browse/PIG-2031
> Project: Pig
> Issue Type: Bug
> Reporter: Jacob Perkins
> Attachments: toppatch.txt
>
>
> If a NULL DataBag is passed to org.apache.pig.builtin.TOP then a NPE is
> thrown. Consider:
> {code}
> $: cat foo.tsv
> a {(foo,1),(bar,2)}
> b
> c {(fyha,4),(asdf,9)}
> {code}
> then:
> {code}
> data = LOAD 'foo.tsv' AS (key:chararray, a_bag:bag {t:tuple (name:chararray,
> value:int)});
> tpd = FOREACH data {
> top_n = TOP(1, 1, a_bag);
> GENERATE
> key AS key,
> top_n AS top_n
> ;
> };
> DUMP tpd;
> {code}
> will throw an NPE when it gets to the row with no bag.
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