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https://issues.apache.org/jira/browse/PIG-1241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12834947#action_12834947
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Olga Natkovich commented on PIG-1241:
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Ying, I thought that accumlate is on by default but it looks like you are
setting it on only if the property is present. Is this true?
> Accumulator is turned on when a map is used with a non-accumulative UDF
> -----------------------------------------------------------------------
>
> Key: PIG-1241
> URL: https://issues.apache.org/jira/browse/PIG-1241
> Project: Pig
> Issue Type: Bug
> Reporter: Ying He
> Attachments: accum.patch
>
>
> Exception is thrown for a script like the following:
> register /homes/yinghe/owl/string.jar;
> a = load 'a.txt' as (id, url);
> b = group a by (id, url);
> c = foreach b generate COUNT(a), (CHARARRAY)
> string.URLPARSE(group.url)#'url';
> dump c;
> In this query, URLPARSE() is not accumulative, and it returns a map.
> The accumulator optimizer failed to check UDF in this case, and tries to run
> the job in accumulative mode. ClassCastException is thrown when trying to
> cast UDF into Accumulator interface.
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