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From "Uwe L. Korn (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ARROW-462) [C++] Implement in-memory conversions between non-nested primitive types and DictionaryArray equivalent
Date Fri, 06 Jan 2017 16:35:58 GMT

    [ https://issues.apache.org/jira/browse/ARROW-462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15804932#comment-15804932
] 

Uwe L. Korn commented on ARROW-462:
-----------------------------------

Ah, that makes sense. This may be possible to provide with {{std::unordered_map}} but maybe
not in a simple way.

> [C++] Implement in-memory conversions between non-nested primitive types and DictionaryArray
equivalent
> -------------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-462
>                 URL: https://issues.apache.org/jira/browse/ARROW-462
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: C++
>            Reporter: Wes McKinney
>
> We use a hash table to extract unique values and dictionary indices. There may be an
opportunity to consolidate common code from the dictionary encoding implementation implemented
in parquet-cpp (but the dictionary indices will not be run-length encoded in Arrow):
> https://github.com/apache/parquet-cpp/blob/master/src/parquet/encodings/dictionary-encoding.h



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