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https://issues.apache.org/jira/browse/PIG-1941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012573#comment-13012573
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Daniel Dai commented on PIG-1941:
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Here schema for b is (group, bag), if you say COUNT( * ), it will feed the
whole schema b to COUNT, and COUNT get confused. You need to say COUNT(a).
> Dumping a scalar launches ClassCastException
> --------------------------------------------
>
> Key: PIG-1941
> URL: https://issues.apache.org/jira/browse/PIG-1941
> Project: Pig
> Issue Type: Bug
> Components: impl
> Affects Versions: 0.8.0
> Reporter: Gianmarco De Francisci Morales
> Fix For: 0.9.0
>
>
> The following script fails launching a class cast exception:
> java.lang.ClassCastException: java.lang.String cannot be cast to
> org.apache.pig.data.DataBag
> {code}
> a = LOAD 'a.txt' as (line:chararray);
> b = GROUP a ALL;
> c = FOREACH b GENERATE COUNT(*) AS sum;
> DUMP c;
> {code}
> However, this other script works correctly:
> {code}
> a = LOAD 'a.txt' as (line:chararray);
> b = GROUP a ALL;
> c = FOREACH b GENERATE COUNT(*) AS sum;
> d = ORDER a BY $0;
> DUMP d;
> {code}
> So I assume there is something strange in the DUMP operator.
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