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

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.0.0
• Component/s: C++
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/17198
• Assignee: Wes McKinney
• Reporter: Wes McKinney
• Created: 24/May/20 13:00
• Updated: 11/Jan/23 08:03
• Resolved: 28/May/20 21:07

Description

By setting the output type in CastOptions, we can write

call_function("cast", [arg], cast_options)

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

CAST(expr AS target_type)

Issue Links

• is a child of: ARROW-8894 [C++] C++ array kernels framework and execution buildout (umbrella issue)
• links to: GitHub Pull Request #7258