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Posted to issues@arrow.apache.org by "Uwe L. Korn (JIRA)" <ji...@apache.org> on 2017/01/06 16:26:58 UTC
[jira] [Commented] (ARROW-462) [C++] Implement in-memory
conversions between non-nested primitive types and DictionaryArray
equivalent
[ 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
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