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https://issues.apache.org/jira/browse/PIG-4651?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14682441#comment-14682441
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Daniel Dai commented on PIG-4651:
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+1. Note this patch also fix the comparator used in skewed join.
> Optimize NullablePartitionWritable serialization for skewed join
> ----------------------------------------------------------------
>
> Key: PIG-4651
> URL: https://issues.apache.org/jira/browse/PIG-4651
> Project: Pig
> Issue Type: Improvement
> Reporter: Rohini Palaniswamy
> Assignee: Rohini Palaniswamy
> Fix For: 0.16.0
>
> Attachments: PIG-4651-1.patch
>
>
> Currently the class name of the skewed join key type is serialized for
> every record in NullablePartitionWritable which is a lot of waste
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