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https://issues.apache.org/jira/browse/ORC-339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16436395#comment-16436395
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ASF GitHub Bot commented on ORC-339:
------------------------------------

Github user wgtmac commented on a diff in the pull request:

    https://github.com/apache/orc/pull/247#discussion_r181239251
  
    --- Diff: site/specification/ORCv2.md ---
    @@ -0,0 +1,1032 @@
    +---
    +layout: page
    +title: Evolving Draft for ORC Specification v2
    +---
    +
    +This specification is rapidly evolving and should only be used for
    +developers on the project.
    +
    +# TO DO items
    +
    +The list of things that we plan to change:
    +
    +* Create a decimal representation with fixed scale using rle.
    +* Create a better float/double encoding that splits mantissa and
    +  exponent.
    +* Create a dictionary encoding for float, double, and decimal.
    +* Create RLEv3:
    +   * 64 and 128 bit variants
    +   * Zero suppression
    +   * Evaluate the rle subformats
    +* Group stripe data into stripelets to enable Async IO for reads.
    +* Reorder stripe data into (stripe metadata, index, dictionary, data)
    +* Stop sorting dictionaries and record the sort order separately in the 
index.
    +* Remove use of RLEv1 and RLEv2.
    +* Remove non-utf8 bloom filter.
    +* Use numeric value for decimal bloom filter.
    --- End diff --
    
    We may also use numeric value for decimal column statistics


> Reorganize ORC specification
> ----------------------------
>
>                 Key: ORC-339
>                 URL: https://issues.apache.org/jira/browse/ORC-339
>             Project: ORC
>          Issue Type: Improvement
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>            Priority: Major
>
> Currently we've put the ORC format specification in the documentation. Now 
> that we are starting the work to design ORCv2, it will be more convenient to 
> have each file format version as a separate page. 



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