[ARROW-4578] [JS] Float16Vector toArray should be zero-copy

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: JS-0.4.0
• Fix Version/s: JS-0.4.1
• Component/s: JavaScript
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/15976
• Assignee: Paul Taylor
• Reporter: Paul Taylor
• Created: 14/Feb/19 21:40
• Updated: 11/Jan/23 07:34
• Resolved: 23/Feb/19 02:24

Description

The Float16Vector#toArray() implementation currently transforms each half float into a single float, and returns a Float32Array. All the other toArray() implementations are zero-copy, and this deviation would break anyone expecting to give two-byte half floats to native APIs like WebGL. We should instead include Float16Vector#toFloat32Array() and Float16Vector#toFloat64Array() convenience methods that do rely on copying.

Issue Links

• links to: GitHub Pull Request #3653