[ARROW-210] [C++] Tidy up the type system a little bit

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.1.0
• Component/s: C++
• External issue URL: https://github.com/apache/arrow/issues/15557
• Assignee: Micah Kornfield
• Reporter: Micah Kornfield
• Created: 03/Jun/16 08:52
• Updated: 11/Jan/23 07:07
• Resolved: 16/Jun/16 17:58

Description

• Fix type equality to compare subtypes
• Layer in a binary type for string types
• Remove Varchar type (and possibly char type, or add it to the metadata) per previous discussion on thread.