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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-1259) improve Trevni encoding of sparse fields
Date Wed, 27 Mar 2013 23:43:15 GMT

     [ https://issues.apache.org/jira/browse/AVRO-1259?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Doug Cutting updated AVRO-1259:
-------------------------------

    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

I committed this.
                
> improve Trevni encoding of sparse fields
> ----------------------------------------
>
>                 Key: AVRO-1259
>                 URL: https://issues.apache.org/jira/browse/AVRO-1259
>             Project: Avro
>          Issue Type: Improvement
>          Components: trevni
>            Reporter: Doug Cutting
>            Assignee: Doug Cutting
>             Fix For: 1.7.5
>
>         Attachments: AVRO-1259.patch, AVRO-1259.patch, AVRO-1259.patch
>
>
> If in most records a field is null, Trevni writes a null byte (zero length) for that
record in that column.  This might be optimized by instead using a run-length encoding for
lengths.  The length is signed, so negative lengths might be used to indicate the number of
zero-lengths before the next non-zero value.  This could thus be back-compatible.

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