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https://issues.apache.org/jira/browse/AVRO-806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267465#comment-13267465
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alex gemini commented on AVRO-806:
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compression always treat everything as raw bytes,encoding and decoding only
apply to a certain pattern.The encodec and decodec should be separated,for
example for dictionary encoding(like email column or address column),we will
decoding it only when we need exact value,if we just need to count the total
number of row,the application program will tell how fileformat treat that.For
simplicity,we always decoding it first.
> add a column-major codec for data files
> ---------------------------------------
>
> Key: AVRO-806
> URL: https://issues.apache.org/jira/browse/AVRO-806
> Project: Avro
> Issue Type: New Feature
> Components: java, spec
> Reporter: Doug Cutting
> Assignee: Doug Cutting
> Fix For: 1.7.0
>
> Attachments: AVRO-806-v2.patch, AVRO-806.patch, avro-file-columnar.pdf
>
>
> Define a codec that, when a data file's schema is a record schema, writes
> blocks within the file in column-major order. This would permit better
> compression and also permit efficient skipping of fields that are not of
> interest.
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