Plan master:
------------

 Finalize Aggregate (actual time=875.382..886.935 rows=1.00 loops=1)
   Buffers: shared hit=144 read=1001172
   ->  Gather (actual time=868.104..886.929 rows=8.00 loops=1)
         Workers Planned: 7
         Workers Launched: 7
         Buffers: shared hit=144 read=1001172
         ->  Partial Aggregate (actual time=865.977..865.978 rows=1.00 loops=8)
               Buffers: shared hit=144 read=1001172
               ->  Parallel Bitmap Heap Scan on test (actual time=342.064..861.735 rows=124846.50 loops=8)
                     Recheck Cond: (col1 < 1000000)
                     Heap Blocks: exact=127142
                     Buffers: shared hit=144 read=1001172
                     Worker 0:  Heap Blocks: exact=122278
                     Worker 1:  Heap Blocks: exact=124066
                     Worker 2:  Heap Blocks: exact=126007
                     Worker 3:  Heap Blocks: exact=122601
                     Worker 4:  Heap Blocks: exact=127794
                     Worker 5:  Heap Blocks: exact=124895
                     Worker 6:  Heap Blocks: exact=123989
                     ->  Bitmap Index Scan on test_col1_idx (actual time=144.824..144.824 rows=998772.00 loops=1)
                           Index Cond: (col1 < 1000000)
                           Index Searches: 1
                           Buffers: shared read=2397


Plan patched:
-------------

 Finalize Aggregate (actual time=800.958..811.642 rows=1.00 loops=1)
   Buffers: shared hit=144 read=1001172
   ->  Gather (actual time=798.645..811.636 rows=8.00 loops=1)
         Workers Planned: 7
         Workers Launched: 7
         Buffers: shared hit=144 read=1001172
         ->  Partial Aggregate (actual time=796.264..796.264 rows=1.00 loops=8)
               Buffers: shared hit=144 read=1001172
               ->  Parallel Bitmap Heap Scan on test (actual time=289.284..792.197 rows=124846.50 loops=8)
                     Recheck Cond: (col1 < 1000000)
                     Heap Blocks: exact=123881
                     Buffers: shared hit=144 read=1001172
                     Worker 0:  Heap Blocks: exact=122751
                     Worker 1:  Heap Blocks: exact=125432
                     Worker 2:  Heap Blocks: exact=122463
                     Worker 3:  Heap Blocks: exact=126538
                     Worker 4:  Heap Blocks: exact=127470
                     Worker 5:  Heap Blocks: exact=124592
                     Worker 6:  Heap Blocks: exact=125645
                     ->  Bitmap Index Scan on test_col1_idx (actual time=142.290..142.290 rows=998772.00 loops=1)
                           Index Cond: (col1 < 1000000)
                           Index Searches: 1
                           Buffers: shared read=2397
 Planning Time: 0.090 ms
 Execution Time: 811.669 ms