[jira] [Commented] (PARQUET-225) INT64 support for Delta Encoding

["Jakub Liska (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PARQUET-225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15742264#comment-15742264 ] 

Jakub Liska commented on PARQUET-225:
-------------------------------------

Guys how do I enable it?  I tried to encode : 
{code:java}
Types.required(PrimitiveTypeName.INT64).named("foo")
{code}

that starts from 0 being incremented by 1, but I the resulting parquet file size is identical in 1.9.0 and 1.8.0 versions...

Is there something I have to enable for Delta Encoding to get applied? 

> 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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