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                                            
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 HashAggregate  (cost=4186.96..5432.88 rows=38336 width=62)
   Group By: col5
   Rows out:  6401 rows with 289 ms to first row, 295 ms to end, start offset by 0.143 ms.
   Executor memory:  2818K bytes.
   ->  Seq Scan on test_group  (cost=0.00..1480.56 rows=108256 width=62)
         Rows out:  100000 rows with 0.023 ms to first row, 48 ms to end, start offset by 0.218 ms.
 Slice statistics:
   (slice0)    Executor memory: 2996K bytes.
 Settings:  enable_seqscan=off
 Total runtime: 296.283 ms
(10 rows)