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https://issues.apache.org/jira/browse/PIG-5224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16024946#comment-16024946
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Koji Noguchi commented on PIG-5224:
-----------------------------------
bq. That's only if user write "foreach" statement carefully. If he project a
column but never used in the script, Column pruner will still think this is a
column should remove.
Ah, you're right (as always) :)
Committing pig-5224-v2.patch.
> Extra foreach from ColumnPrune preventing Accumulator usage
> -----------------------------------------------------------
>
> Key: PIG-5224
> URL: https://issues.apache.org/jira/browse/PIG-5224
> Project: Pig
> Issue Type: Improvement
> Reporter: Koji Noguchi
> Assignee: Koji Noguchi
> Attachments: pig-5224-v0-testonly.patch, pig-5224-v1.patch,
> pig-5224-v2.patch
>
>
> {code}
> A = load 'input' as (id:int, fruit);
> B = foreach A generate id; -- to enable columnprune
> C = group B by id;
> D = foreach C {
> o = order B by id;
> generate org.apache.pig.test.utils.AccumulatorBagCount(o);
> }
> STORE D into ...
> {code}
> Pig fails to use Accumulator interface for this UDF.
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