Instead of immediately pushing to outputs, ExecNodes should package their work into tasks and defer execution to allow more sophisticated external scheduling. This will also relieve pipeline breaking ExecNodes of the responsibility to ensure their work is correctly parallelized.

Reporter: Ben Kietzman / @bkietz
Assignee: Alexander Ocsa / @aocsa

Related issues:

• [C++] Query engine umbrella issue (is a child of)

PRs and other links:

• GitHub Pull Request #11210

_{Note: This issue was originally created as ARROW-13576. Please see the migration documentation for further details.}