| Bug #120809 | Optimizer misses DISTINCT early-out and chooses 40M-row hash join Cartesian product | ||
|---|---|---|---|
| Submitted: | 29 Jun 7:31 | Modified: | 2 Jul 14:07 |
| Reporter: | ZHAOYANG ZHANG | Email Updates: | |
| Status: | Verified | Impact on me: | |
| Category: | MySQL Server: Optimizer | Severity: | S5 (Performance) |
| Version: | 9.7.1 and 8.0.31 | OS: | Ubuntu (22.04.4 LTS) |
| Assigned to: | CPU Architecture: | Any | |
| Tags: | distinct, firstmatch, hash join, JOIN_ORDER, Optimizer, performance, semijoin | ||
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