Commits on Jun 20, 2023

1. Implement PGRXSharedMemory for Deque …

   Having a double ended queue allows for more efficient FIFO workloads
   when using shared memory
   
   Sample usage:
   
       shmem=# select * from deque_count();
        deque_count
       -------------
                  0
   
       shmem=# select deque_push_front('{"value1": 2, "value2": 2}');
        deque_push_front
       ------------------
   
       shmem=# select deque_push_front('{"value1": 1, "value2": 1}');
        deque_push_front
       ------------------
   
       shmem=# select deque_push_back('{"value1": 3, "value2": 3}');
        deque_push_back
       -----------------
   
       shmem=# select deque_push_back('{"value1": 4, "value2": 4}');
        deque_push_back
       -----------------
   
       shmem=# select * from deque_select();
             deque_select
       -------------------------
        {"value1":1,"value2":1}
        {"value1":2,"value2":2}
        {"value1":3,"value2":3}
        {"value1":4,"value2":4}
       (4 rows)
   
       shmem=# select deque_pop_front();
            deque_pop_front
       -------------------------
        {"value1":1,"value2":1}
   
       shmem=# select deque_pop_back();
            deque_pop_back
       -------------------------
        {"value1":4,"value2":4}

   

   feikesteenbergen committed Jun 20, 2023
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