[C++] Simplify primitive array type builders to use a default type singleton #15970
Description
Currently the builder classes all expect to be passed a shared_ptr<DataType> – for the primitive types (boolean, numbers, strings, etc.) it would be simpler to default to a common value rather than requiring that you obtain an instance yourself from someplace (e.g. arrow::uint8() as in the WIP patch for ARROW-373)
Reporter: Wes McKinney / @wesm
Assignee: Uwe Korn / @xhochy
Related issues:
- Arrow release 0.2 (blocks)
Note: This issue was originally created as ARROW-381. Please see the migration documentation for further details.