[jira] [Updated] (ARROW-10163) [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-10163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Lamb updated ARROW-10163:
--------------------------------
    Summary: [Rust] [DataFusion] Allow DataFusion to cast all type combinations supported by Arrow cast kernel  (was: [Rust] [DataFusion] Allow DataFusion to cast all type combinations supposed by Arrow cast kernel)

> [Rust] [DataFusion] Allow DataFusion to cast all type combinations supported by Arrow cast kernel
> -------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-10163
>                 URL: https://issues.apache.org/jira/browse/ARROW-10163
>             Project: Apache Arrow
>          Issue Type: Sub-task
>            Reporter: Andrew Lamb
>            Assignee: Andrew Lamb
>            Priority: Major
>
> 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



--
This message was sent by Atlassian Jira
(v8.3.4#803005)