[jira] [Commented] (ARROW-4083) [C++] Allowing ChunkedArrays to contain a mix of DictionaryArray and dense Array (of the dictionary type)

["Wes McKinney (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-4083?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16852569#comment-16852569 ] 

Wes McKinney commented on ARROW-4083:
-------------------------------------

I think this could be addressed at the dataframe level, removing from any milestone for now

> [C++] Allowing ChunkedArrays to contain a mix of DictionaryArray and dense Array (of the dictionary type)
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-4083
>                 URL: https://issues.apache.org/jira/browse/ARROW-4083
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>              Labels: dataframe
>
> In some applications we may receive a stream of some dictionary encoded data followed by some non-dictionary encoded data. For example this happens in Parquet files when the dictionary reaches a certain configurable size threshold.
> We should think about how we can model this in our in-memory data structures, and how it can flow through to relevant computational components (i.e. certain data flow observers -- like an Aggregation -- might need to be able to process either a dense or dictionary encoded version of a particular array in the same stream)



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)