Rachelint commented on PR #15591:
URL: https://github.com/apache/datafusion/pull/15591#issuecomment-2823308375
I add a query in `extened.sql`, the blocked approach can get a obvious
improvement as expected:
- sql:
```sql
SELECT "WatchID", MIN("ResolutionWidth"), MAX("ResolutionWidth"),
SUM("IsRefresh") FROM hits GROUP BY "WatchID" ORDER BY "WatchID" DESC LIMIT 10;
```
- disable blocked approach:
```
Query 7 iteration 0 took 8532.5 ms and returned 10 rows
Query 7 iteration 1 took 8214.4 ms and returned 10 rows
Query 7 iteration 2 took 8017.6 ms and returned 10 rows
Query 7 iteration 3 took 8283.9 ms and returned 10 rows
Query 7 iteration 4 took 7913.1 ms and returned 10 rows
Query 7 avg time: 8192.27 ms
```
- enable blocked approach:
```
Query 7 iteration 0 took 7613.3 ms and returned 10 rows
Query 7 iteration 1 took 7252.4 ms and returned 10 rows
Query 7 iteration 2 took 7520.5 ms and returned 10 rows
Query 7 iteration 3 took 7193.6 ms and returned 10 rows
Query 7 iteration 4 took 7235.4 ms and returned 10 rows
Query 7 avg time: 7363.00 ms
```
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