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https://issues.apache.org/jira/browse/HIVE-1438?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mayank Lahiri updated HIVE-1438:
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Attachment: HIVE-1438.1.patch
> sentences() UDF for natural language tokenization
> -------------------------------------------------
>
> Key: HIVE-1438
> URL: https://issues.apache.org/jira/browse/HIVE-1438
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Affects Versions: 0.7.0
> Reporter: Mayank Lahiri
> Assignee: Mayank Lahiri
> Fix For: 0.7.0
>
> Attachments: HIVE-1438.1.patch
>
>
> Create a generic UDF that tokenizes free-form natural language text into
> sentences and words for more advanced processing, while stripping unnecessary
> punctuation and being fully international-aware. Fortunately, most of this
> functionality is already built into Java in the form of the i8n BreakIterator
> class, so this UDF will just connect it to Hive. For example:
> > SELECT sentences("Hello there! This is a UDF.") FROM somedata LIMIT 1;
> [ ["Hello", "there"], ["This", "is", "a", "UDF"] ]
> or
> > SELECT sentences("Je m'apelle hive!!!", "fr") FROM somedata LIMIT 1;
> [["Je","m'apelle","hive"]]
> Notice how punctuation is maintained only where appropriate. Breaking at
> sentences (and thus the nested array return type) is important for tasks like
> counting the frequency of n-grams in text, which should not cross sentence
> boundaries.
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