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https://issues.apache.org/jira/browse/AVRO-1259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13616956#comment-13616956
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Hudson commented on AVRO-1259:
------------------------------
Integrated in AvroJava #360 (See [https://builds.apache.org/job/AvroJava/360/])
AVRO-1259. Java: Improve Trevni's encoding of sparse columns. (Revision
1461896)
Result = SUCCESS
cutting :
Files :
* /avro/trunk/CHANGES.txt
*
/avro/trunk/lang/java/trevni/core/src/main/java/org/apache/trevni/ArrayColumnOutputBuffer.java
*
/avro/trunk/lang/java/trevni/core/src/main/java/org/apache/trevni/ColumnFileReader.java
*
/avro/trunk/lang/java/trevni/core/src/main/java/org/apache/trevni/ColumnFileWriter.java
*
/avro/trunk/lang/java/trevni/core/src/main/java/org/apache/trevni/ColumnOutputBuffer.java
*
/avro/trunk/lang/java/trevni/core/src/main/java/org/apache/trevni/InputBuffer.java
* /avro/trunk/lang/java/trevni/doc/apt/spec.apt
> 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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