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Posted to issues@arrow.apache.org by "Mahmut Bulut (Jira)" <ji...@apache.org> on 2020/04/24 12:21:00 UTC
[jira] [Commented] (ARROW-5949) [Rust] Implement DictionaryArray
[ https://issues.apache.org/jira/browse/ARROW-5949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091512#comment-17091512 ]
Mahmut Bulut commented on ARROW-5949:
-------------------------------------
Hi, I've just seen this. Is there any reason why we provide custom iterator over keys? Which is basically resolving into Option or None? Can we use 0 as a null identifier?
> [Rust] Implement DictionaryArray
> --------------------------------
>
> Key: ARROW-5949
> URL: https://issues.apache.org/jira/browse/ARROW-5949
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Rust
> Reporter: David Atienza
> Assignee: David Atienza
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.17.0
>
> Time Spent: 18h
> Remaining Estimate: 0h
>
> I am pretty new to the codebase, but I have seen that DictionaryArray is not implemented in the Rust implementation.
> I went through the list of issues and I could not see any work on this. Is there any blocker?
>
> The specification is a bit [short|https://arrow.apache.org/docs/format/Layout.html#dictionary-encoding] or even [non-existant|https://arrow.apache.org/docs/format/Metadata.html#dictionary-encoding], so I am not sure how to implement it myself.
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