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https://issues.apache.org/jira/browse/PARQUET-225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15742532#comment-15742532
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Ryan Blue commented on PARQUET-225:
-----------------------------------
[~l154k], parquet format 2.0 encodings aren't enabled by default because we
haven't finalized the set of encodings that must be supported for 2.0. You can
read and write the current set by explicitly setting your writer to use version
2.
> INT64 support for Delta Encoding
> --------------------------------
>
> Key: PARQUET-225
> URL: https://issues.apache.org/jira/browse/PARQUET-225
> Project: Parquet
> Issue Type: New Feature
> Reporter: Vassil Lunchev
> Assignee: Vassil Lunchev
> Fix For: 1.9.0
>
>
> As of now, parquet doesn't support delta encoding for INT64. However it is
> planned in the format:
> https://github.com/Parquet/parquet-format/blob/master/Encodings.md
> The benefits of this feature are huge. For timestamps it achieves twice
> better compression than SNAPPY on plain encoding, and the reading is faster.
> This feature is actually advertised on the home page of Parquet, even though
> it is not yet implemented:
> http://parquet.incubator.apache.org/
> http://image.slidesharecdn.com/hadoopsummit-140630160016-phpapp01/95/efficient-data-storage-for-analytics-with-apache-parquet-20-30-638.jpg?cb=1404162126
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