Weston Pace created ARROW-15732:
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Summary: [C++] Do not use any CPU threads in execution plan when
use_threads is false
Key: ARROW-15732
URL: https://issues.apache.org/jira/browse/ARROW-15732
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Weston Pace
Assignee: Weston Pace
Currently, scan operations that supply use_threads=false will use 1 CPU thread,
the calling thread, and some # of I/O threads. We should remove that CPU
thread from being used.
It is being used at the moment because we need something to transfer work onto
when asynchronous I/O tasks complete. We can fix this by allowing a serial
executor to run an async generator (creating an iterator). This will also
allow us to change the execution plan so that it always expects an executor to
be present which should simplify the logic.
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