Mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
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 16:26:58 GMT

    [ https://issues.apache.org/jira/browse/ARROW-462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15804914#comment-15804914
] 

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

Might be also a point to reconsider if it's worth to have a custom hash-table implementation
or if using {{std:unordered_map}} is leaving us with the same performance.

> [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



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message