[jira] [Closed] (ARROW-10165) [Rust] [DataFusion] Allow DataFusion to cast all type combinations supported by Arrow cast kernel

["Andrew Lamb (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-10165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Lamb closed ARROW-10165.
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    Resolution: Duplicate

> [Rust] [DataFusion] Allow DataFusion to cast all type combinations supported by Arrow cast kernel
> -------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-10165
>                 URL: https://issues.apache.org/jira/browse/ARROW-10165
>             Project: Apache Arrow
>          Issue Type: Sub-task
>            Reporter: Andrew Lamb
>            Assignee: Andrew Lamb
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 2h
>  Remaining Estimate: 0h
>
> When the  DataFusion planner inserts casts, today it relies on special logic to determine the valid coded casts. 
> The actual arrow cast kernels support a much wider range of data types, and thus DataFusion is artificially limiting the casts it supports for no particularly good reason I can see.
> This ticket tracks the work to remove the extra casting checking in the datafusion planner and instead simply rely on runtime check of arrow cast compute kernel
> The potential  downside of this approach is that the error may be generated later in the execution process (rather than the planner), and possibly have a less specific error message, the upside is there is less code and we get several conversions immediately (like timestamp predicate casting)
> I also plan to add DictionaryArray support to the casting kernels and I would like to avoid having to replicate some part of that logic in DataFusion



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