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https://issues.apache.org/jira/browse/ARROW-6666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16947357#comment-16947357
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Davis Silverman commented on ARROW-6666:
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Looking more into this, it seems like more difficulty than I am prepared to 
take on right now. It seems I would need to do a lot of plumbing to allow the 
Utf8 type to be allowed, so i tried to create an ArrowPrimitiveType for some 
Utf8Type, but there isnt any examples on how to do this for a variable-sized 
datatype. So maybe I wont take it after all! Sorry for wasting time here, I see 
this is the last task in 5227, so feel free to take it if you want.

> [Rust] [DataFusion] Implement string literal expression
> -------------------------------------------------------
>
>                 Key: ARROW-6666
>                 URL: https://issues.apache.org/jira/browse/ARROW-6666
>             Project: Apache Arrow
>          Issue Type: Sub-task
>          Components: Rust, Rust - DataFusion
>            Reporter: Andy Grove
>            Priority: Major
>              Labels: beginner
>             Fix For: 1.0.0
>
>
> Implement string literal expression in the new physical query plan. It is 
> already implemented in the code that executed directly from the logical plan 
> so it should largely be a copy and paste exercise.



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