alamb commented on issue #15949:
URL: https://github.com/apache/datafusion/issues/15949#issuecomment-2891161932
I noticed the above query has only 91 groups:
```sql
DataFusion CLI v47.0.0
> SELECT
"OS",
AVG(to_timestamp("ResponseEndTiming")-to_timestamp("ResponseStartTiming"))
as
avg_response_time,AVG(to_timestamp("ResponseEndTiming")-to_timestamp("ConnectTiming"))
as avg_latency
FROM
'data/hits_partitioned'
GROUP BY
"OS"
ORDER BY
avg_latency DESC;
+-----+-------------------------------------------+------------------------------------------+
| OS | avg_response_time | avg_latency
|
+-----+-------------------------------------------+------------------------------------------+
| 103 | 0 days 0 hours 13 mins 47.509466437 secs | 0 days 0 hours 13 mins
47.509466437 secs |
| 74 | 0 days 0 hours 12 mins 51.287431013 secs | 0 days 0 hours 13 mins
47.184892702 secs |
| 49 | 0 days 0 hours 13 mins 9.107811258 secs | 0 days 0 hours 13 mins
42.811185779 secs |
| 77 | 0 days 0 hours 9 mins 47.668864464 secs | 0 days 0 hours 11 mins
26.796840642 secs |
| 112 | 0 days 0 hours 3 mins 19.018355160 secs | 0 days 0 hours 8 mins
32.958042116 secs |
| 70 | 0 days 0 hours 1 mins 31.113089802 secs | 0 days 0 hours 8 mins
8.089117199 secs |
| 59 | 0 days 0 hours 0 mins -59.687500000 secs | 0 days 0 hours 4 mins
44.562500000 secs |
| 101 | 0 days 0 hours 0 mins 27.485986881 secs | 0 days 0 hours 4 mins
24.220234545 secs |
| 12 | 0 days 0 hours 0 mins 0.915553578 secs | 0 days 0 hours 3 mins
21.616990075 secs |
| 39 | 0 days 0 hours 2 mins 11.248827183 secs | 0 days 0 hours 3 mins
1.060289083 secs |
| 46 | 0 days 0 hours 2 mins 51.602040816 secs | 0 days 0 hours 2 mins
51.602040816 secs |
| 104 | 0 days 0 hours -1 mins -41.261186264 secs | 0 days 0 hours 2 mins
7.463059313 secs |
| 45 | 0 days 0 hours 0 mins 31.872238129 secs | 0 days 0 hours 1 mins
37.324755565 secs |
| 7 | 0 days 0 hours -2 mins -38.098571146 secs | 0 days 0 hours 1 mins
35.758543491 secs |
| 126 | 0 days 0 hours -2 mins -25.507751501 secs | 0 days 0 hours 1 mins
32.933894412 secs |
| 33 | 0 days 0 hours -2 mins -11.200000000 secs | 0 days 0 hours 1 mins
31.200000000 secs |
| 9 | 0 days 0 hours -3 mins -53.293441768 secs | 0 days 0 hours 1 mins
28.609912908 secs |
| 11 | 0 days 0 hours -3 mins -48.205086798 secs | 0 days 0 hours 1 mins
23.773112636 secs |
| 44 | 0 days 0 hours -2 mins -30.470355300 secs | 0 days 0 hours 1 mins
22.076928357 secs |
| 1 | 0 days 0 hours -2 mins -22.108601400 secs | 0 days 0 hours 1 mins
16.524448796 secs |
| 2 | 0 days 0 hours -2 mins -10.731476126 secs | 0 days 0 hours 1 mins
16.255794248 secs |
| 37 | 0 days 0 hours -1 mins -4.520792848 secs | 0 days 0 hours 1 mins
7.226195102 secs |
| 116 | 0 days 0 hours 0 mins 32.117647058 secs | 0 days 0 hours 1 mins
6.509803921 secs |
| 0 | 0 days 0 hours 0 mins 29.708039353 secs | 0 days 0 hours 0 mins
58.786563598 secs |
| 57 | 0 days 0 hours 0 mins -54.983173266 secs | 0 days 0 hours 0 mins
56.604541731 secs |
| 3 | 0 days 0 hours -1 mins -57.406106095 secs | 0 days 0 hours 0 mins
54.878138590 secs |
| 5 | 0 days 0 hours -1 mins -14.716715226 secs | 0 days 0 hours 0 mins
46.498521635 secs |
| 68 | 0 days 0 hours -1 mins -41.598033744 secs | 0 days 0 hours 0 mins
41.615774557 secs |
| 67 | 0 days 0 hours 0 mins 27.802898817 secs | 0 days 0 hours 0 mins
37.835699842 secs |
| 38 | 0 days 0 hours -1 mins -0.347826086 secs | 0 days 0 hours 0 mins
36.797101449 secs |
| 98 | 0 days 0 hours -1 mins -25.621956238 secs | 0 days 0 hours 0 mins
36.477770676 secs |
| 34 | 0 days 0 hours -1 mins -18.701492537 secs | 0 days 0 hours 0 mins
27.402985074 secs |
| 35 | 0 days 0 hours 0 mins -35.877821173 secs | 0 days 0 hours 0 mins
21.667386721 secs |
| 17 | 0 days 0 hours -1 mins -38.074618882 secs | 0 days 0 hours 0 mins
17.008558438 secs |
| 58 | 0 days 0 hours -3 mins -54.294117647 secs | 0 days 0 hours 0 mins
16.588235294 secs |
| 54 | 0 days 0 hours 0 mins -53.554054054 secs | 0 days 0 hours 0 mins
16.304054054 secs |
| 14 | 0 days 0 hours -3 mins -2.845982142 secs | 0 days 0 hours 0 mins
14.861607142 secs |
| 13 | 0 days 0 hours -1 mins -6.324333862 secs | 0 days 0 hours 0 mins
13.454561496 secs |
| 10 | 0 days 0 hours 0 mins 8.780079478 secs | 0 days 0 hours 0 mins
9.103530175 secs |
| 71 | 0 days 0 hours 0 mins 7.617299688 secs | 0 days 0 hours 0 mins
7.712214154 secs |
| .
|
| .
|
| .
|
+-----+-------------------------------------------+------------------------------------------+
91 row(s) fetched. (First 40 displayed. Use --maxrows to adjust)
Elapsed 0.224 seconds.
```
I recommend we also add other columns to the `GROUP BY` to increase the
number of groups / challenge of the aggregate? That could also be a second
query potentially
```sql
GROUP BY
"RegionID",
"UserAgent",
"OS"
```
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