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https://issues.apache.org/jira/browse/ARROW-10165?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Lamb updated ARROW-10165:
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Summary: [Rust] [DataFusion] Allow DataFusion to cast all type combinations
supported by Arrow cast kernel (was: [Rust] [DataFusion] Add DictionaryArray
coercion support)
> [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: 0.5h
> 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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