takaaki7 commented on PR #15227:
URL: https://github.com/apache/druid/pull/15227#issuecomment-1784010907
- Original:
- p50 2.025s
- p90 2.27s
- With mergeBufferSlicesPerThread 100:
- p50: 2.815s
- p90: 2.94s
So improved about 30%.
Test query:
```sql
SELECT COUNT(*) FROM(SELECT user_id
FROM "eventtable"
WHERE __time > '2022-07-01T00:00:00Z' AND __time < '2022-08-30T00:00:00Z'
AND event_name = 'view'
AND "yy" LIKE '%xx%'
GROUP BY user_id
HAVING COUNT(*) > 100
)
```
Input: 600M rows
Intermediate grouping result rows: 20M rows
Threads: 23 (24core machine)
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