| 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 | ||
If the data you need to attach is more than 50MB, you should create a compressed archive of the data, split it to 50MB chunks, and upload each of them as a separate attachment.
To split a large file:
- On *nix platforms use the split command e.g.
split -b 50MB <my_large_archive> <my_split_archive_prefix> - On windows use WinZip or a similar utility to split the large file
[29 Jun 7:32]
ZHAOYANG ZHANG
[30 Jun 5:13]
ZHAOYANG ZHANG
bug120809_distinct_earlyout_unused_table
Attachment: bug120809_distinct_earlyout_unused_table.sql (application/octet-stream, text), 4.06 KiB.
