C++: Faster valid bitmap building #16190
Description
Currently we build up the bitmaps bit-by-bit which takes very long. Instead we can build them byte-by-byte in the general case and use memset for the non-null case.
Reporter: Uwe Korn / @xhochy
Assignee: Uwe Korn / @xhochy
Note: This issue was originally created as ARROW-553. Please see the migration documentation for further details.