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https://issues.apache.org/jira/browse/PIG-2328?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13482010#comment-13482010
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Daniel Dai commented on PIG-2328:
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They are piggybank UDFs which we have javadoc but no forest doc.
> Add builtin UDFs for building and using bloom filters
> -----------------------------------------------------
>
> Key: PIG-2328
> URL: https://issues.apache.org/jira/browse/PIG-2328
> Project: Pig
> Issue Type: New Feature
> Components: internal-udfs
> Reporter: Alan Gates
> Assignee: Alan Gates
> Fix For: 0.10.0, 0.11
>
> Attachments: PIG-bloom-2.patch, PIG-bloom-3.patch, PIG-bloom.patch
>
>
> Bloom filters are a common way to do select a limited set of records before
> moving data for a join or other heavy weight operation. Pig should add UDFs
> to support building and using bloom filters.
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