[ARROW-7660] [C++][Gandiva] Optimise castVarchar(string, int) function for single byte characters

• Type: Task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.16.0
• Component/s: C++ - Gandiva
• Labels: pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/23906
• Assignee: Projjal Chanda
• Reporter: Projjal Chanda
• Created: 23/Jan/20 08:45
• Updated: 11/Jan/23 07:55
• Resolved: 27/Jan/20 11:14

Description

The current castVarchar function does byte by byte check for handling multibyte characters. Since most of the time string consists of single byte characters optimise it for that case and move to the slow path when multibyte characters detected.

Issue Links

• links to: GitHub Pull Request #6265