[jira] [Updated] (ARROW-8918) [C++] Add cast "metafunction" to FunctionRegistry that addresses dispatching to appropriate type-specific CastFunction

["Wes McKinney (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-8918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney updated ARROW-8918:
--------------------------------
    Description: 
By setting the output type in {{CastOptions}}, we can write

{code}
call_function("cast", [arg], cast_options)
{code}

This simplifies use of casting for binding developers. This mimics the standard SQL

{code}
CAST(expr AS target_type)
{code}

  was:
By setting the output type in {{CastOptions}}, we can write

{code}
call_function("cast", [arg], cast_options)
{code}

This simplifies use of casting for binding developers


> [C++] Add cast "metafunction" to FunctionRegistry that addresses dispatching to appropriate type-specific CastFunction
> ----------------------------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-8918
>                 URL: https://issues.apache.org/jira/browse/ARROW-8918
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Priority: Major
>             Fix For: 1.0.0
>
>
> By setting the output type in {{CastOptions}}, we can write
> {code}
> call_function("cast", [arg], cast_options)
> {code}
> This simplifies use of casting for binding developers. This mimics the standard SQL
> {code}
> CAST(expr AS target_type)
> {code}



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