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https://issues.apache.org/jira/browse/ARROW-4628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661651#comment-17661651
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Rok Mihevc commented on ARROW-4628:
-----------------------------------

This issue has been migrated to [issue 
#15985|https://github.com/apache/arrow/issues/15985] on GitHub. Please see the 
[migration documentation|https://github.com/apache/arrow/issues/14542] for 
further details.

> [Rust] [DataFusion] Implement type coercion query optimizer rule
> ----------------------------------------------------------------
>
>                 Key: ARROW-4628
>                 URL: https://issues.apache.org/jira/browse/ARROW-4628
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: Rust, Rust - DataFusion
>    Affects Versions: 0.12.0
>            Reporter: Andy Grove
>            Assignee: Andy Grove
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.13.0
>
>          Time Spent: 2h 10m
>  Remaining Estimate: 0h
>
> Now that we have a query optimizer, we should re-implement type coercion as 
> an optimizer rule that rewrites expressions with explicit casts where 
> required, so that at runtime we are only comparing like types.
> For example, the expression {{float_column < int_column}} would be rewritten 
> as {{float_column < CAST(int_column AS float)}}.
> DataFusion already has this logic but the current implementation is somewhat 
> hacky and incomplete. Moving it to the optimizer will allow us to implement 
> this correctly.



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