[C++][Acero] High contention in Swiss join build phase

[zanmato1984]

When benchmarking hash join build phase using this benchmark, I saw significant contention when the concurrency is high. As the following flame graph shows, function PartitionLocks::AcquirePartitionLock (the long yellow bar in the middle) takes quite a lot CPU time (thanks to that it is using spin lock rather than mutex, otherwise it may not be so eye-catching).

We should consider optimizing this.

Component(s)

C++