Commits on Nov 16, 2023

1. [Opt](scanner-scheduler) Optimize BlockingQueue, `BlockingPriorityQ… …

   …ueue` and change remote scan thread pool. (apache#26784)
   
   - Optimize `BlockingQueue`, `BlockingPriorityQueue` by swapping `notify` and `unlock` to reduce lock competition. Ref: https://www.boost.org/doc/libs/1_54_0/boost/thread/sync_bounded_queue.hpp
   - Change remote scan thread pool to `PriorityQueue`.
   
   Before:
   ```
   mysql> select  sum(lo_partkey)  from  lineorder;
   +-----------------+
   | sum(lo_partkey) |
   +-----------------+
   | 300021444265405 |
   +-----------------+
   1 row in set (1.11 sec)
   ```
   
   After:
   ```
   mysql> select  sum(lo_partkey)  from  lineorder;
   +-----------------+
   | sum(lo_partkey) |
   +-----------------+
   | 300021444265405 |
   +-----------------+
   1 row in set (0.80 sec)
   ```

   

   kaka11chen committed Nov 16, 2023
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