aligputf8=#  explain analyze select sum(col1),sum(col2),sum(col3),sum(col4),sum(col5),sum(col6),sum(col7),sum(col8),sum(col9) from test_group group by col5;
                                                QUERY PLAN                                               
----------------------------------------------------------------------------------------------------------
 GroupAggregate  (cost=10532.97..14755.93 rows=38336 width=62)
   Group By: col5
   Rows out:  6401 rows with 306 ms to first row, 585 ms to end, start offset by 0.092 ms.
   Executor memory:  8K bytes.
   ->  Sort  (cost=10532.97..10803.61 rows=108256 width=62)
         Sort Key: col5
         Rows out:  100000 rows with 306 ms to first row, 342 ms to end, start offset by 0.093 ms.
         Executor memory:  19449K bytes.
         Work_mem used:  19449K bytes.
         ->  Seq Scan on test_group  (cost=0.00..1480.56 rows=108256 width=62)
               Rows out:  100000 rows with 0.021 ms to first row, 46 ms to end, start offset by 0.116 ms.
 Slice statistics:
   (slice0)    Executor memory: 19623K bytes.  Work_mem: 19449K bytes max.
 Settings:  enable_hashagg=off; enable_seqscan=off
 Total runtime: 586.114 ms
(15 rows)