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From "Bruno Dumon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-2220) Add a binary comparator that only compares up to the length of the supplied byte array
Date Fri, 12 Feb 2010 10:12:28 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Bruno Dumon updated HBASE-2220:
-------------------------------

    Attachment: binary-prefix-comparator-patch.txt

> Add a binary comparator that only compares up to the length of the supplied byte array
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-2220
>                 URL: https://issues.apache.org/jira/browse/HBASE-2220
>             Project: Hadoop HBase
>          Issue Type: New Feature
>          Components: filters
>            Reporter: Bruno Dumon
>            Priority: Minor
>         Attachments: binary-prefix-comparator-patch.txt
>
>
> This new comparator is similar to the existing BinaryComparator, but only compares up
to the length of the supplied byte array.
> The use-case I need this for is secondary indexes. I build a table where the row keys
have the form {value}{row key}, where {value} is a fixed length byte array. On this index
table I then would like to perform range scans on just the fixed length {value} part. The
BinaryPrefixComparator supplied in this patch enables exactly this, when used in combination
with the RowFilter.
> See also mail at
> http://mail-archives.apache.org/mod_mbox/hadoop-hbase-user/201002.mbox/%3Cf5a74c8e1002100716y56371298xc96e482a6486d939@mail.gmail.com%3E

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