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https://issues.apache.org/jira/browse/AVRO-806?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13022379#comment-13022379
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Dmitriy V. Ryaboy commented on AVRO-806:
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Not having elements of depth > 1 would basically eliminate all of our schemas 
from using this.

Are there enough people out there who would be able to weather this constraint 
for the simpler version to be effectively tested before complications are added 
in? 

Seems like since in this case we know what the expected complications will be, 
it's better to design with them in mind from the start and avoid surprises 
later.

> 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
>
> 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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