[
https://issues.apache.org/jira/browse/ARROW-462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17657496#comment-17657496
]
Rok Mihevc commented on ARROW-462:
----------------------------------
This issue has been migrated to [issue
#16106|https://github.com/apache/arrow/issues/16106] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [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
> Assignee: Uwe Korn
> Priority: Major
> Fix For: 0.5.0
>
>
> 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 functionality also needs to permit encoding split across multiple record
> batches -- so the hash table would be a stateful entity, and we can continue
> to hash more chunks of data to dictionary-encode multiple arrays with a
> shared dictionary at the end.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
