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Posted to dev@avro.apache.org by "Doug Cutting (JIRA)" <ji...@apache.org> on 2013/02/20 01:43:13 UTC

[jira] [Created] (AVRO-1259) improve Trevni encoding of sparse fields

Doug Cutting created AVRO-1259:
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             Summary: 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


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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