[C++] CopyBitmap into existing memory #15785
Description
CopyBitmap currently always allocates a new Buffer for its result. We also want to support the case where we insert into existing memory.
Reporter: Uwe Korn / @xhochy
Assignee: Uwe Korn / @xhochy
PRs and other links:
Note: This issue was originally created as ARROW-3143. Please see the migration documentation for further details.