[jira] [Comment Edited] (ARROW-5949) [Rust] Implement DictionaryArray

["Mahmut Bulut (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-5949?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091512#comment-17091512 ] 

Mahmut Bulut edited comment on ARROW-5949 at 4/24/20, 12:20 PM:
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Hi, I've just seen this. Is there any reason why we provide custom iterator over keys? (Which is basically resolving into Option) Can we use 0 as a null identifier?


was (Author: vertexclique):
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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