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| ID# | Date | Updated | Type | Status | Sev | Version | OS | CPU | Summary |
|---|---|---|---|---|---|---|---|---|---|
| 26232 | 2007-02-09 17:28 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (6418 days) | S3 | 4.1.22, 5.0.34, 5.0.36-BK | Linux (Linux) | Any | review of bug #20944 / proof of concept attached |
| 29443 | 2007-06-29 13:28 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (5081 days) | S3 | 5.1.19 | Any | Any | cost calculations are off |
| 42948 | 2009-02-17 23:02 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (5671 days) | S5 | 5.0.67-0ubuntu6, 6.0.11 | Linux (Ubuntu 8.10) | Any | MySQL Optimizer does not properly use Indexes on Views with "Group By" |
| 44549 | 2009-04-29 17:47 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified | S3 | 5.0.80, 5.1.34 | Any | Any | optimizer incorrectly chooses table scan and filesort over index |
| 44201 | 2009-04-10 3:04 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (5202 days) | S3 | 5.1.32, 5.1.35-bzr, 6.0.11-bzr, 5.0, 5.6.99 | Any | Any | Performance problem with View |
| 46376 | 2009-07-24 17:05 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (5523 days) | S5 | 5.0.85, 5.1.36, 5.1.38, 5.1.39 | Windows (XP) | Any | Optimizer choose wrong index even when where clause and order-by are covered |
| 48049 | 2009-10-14 16:46 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified | S3 | 5.1.37, 5.5.7 | Any | Any | SELECT MIN(1) reports differently for MERGE tables in 5.0 and 5.1 |
| 47454 | 2009-09-19 19:33 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (5470 days) | S3 | 5.1.35 | Any | Any | Not exists optimization method is not used for NULL columns in the right table |
| 58101 | 2010-11-10 0:21 | 2018-09-09 20:45 | MySQL Server: Optimizer | Verified (5053 days) | S5 | 5.1.38-community-log, 5.1.54-bzr | Linux | Any | Optimizer picks wrong order of queries |
| 67351 | 2012-10-24 8:02 | 2017-05-03 16:04 | MySQL Server: Partitions | Verified (4302 days) | S2 | 5.5.27-29.0 | Linux | Any | Cardinality samples of partitioned tables sometimes widely off |
| 68554 | 2013-03-03 16:16 | 2022-03-14 16:43 | MySQL Server: Optimizer | Verified (4195 days) | S5 | 5.6.10 | Any | Any | Optimizer wrongly choses covering index over ICP |
| 71191 | 2013-12-20 15:30 | 2013-12-20 20:20 | MySQL Server: Optimizer | Verified (3918 days) | S3 | 5.5.33 | Any | Any | Loose index scan is used even though full table scan/tight index scan is faster |
| 71199 | 2013-12-21 18:16 | 2014-01-28 17:45 | MySQL Server: Optimizer | Verified (3915 days) | S3 | 5.6.14, 5.6.15, 5.5.35 | Any | Any | Optimizer's estimated number of rows is 2 times wrong for (loose?) index scans |
| 71189 | 2013-12-20 14:56 | 2021-08-08 20:45 | MySQL Server: Documentation | Verified (3918 days) | S3 | 5.5, any | Any | Any | Manual does not provide enough details on how loose index scan really works |
| 74049 | 2014-09-24 8:01 | 2014-09-24 10:01 | MySQL Server: Optimizer | Verified (3640 days) | S3 | 5.6.19-67.0, 5.6.22 | Any | Any | Update query use filesort instead of index |
| 74083 | 2014-09-25 18:11 | 2014-10-09 12:58 | MySQL Server: Optimizer | Verified (3625 days) | S5 | 5.6.20, 5.6.22 | Linux (CentOS 6.5) | Any | ENUM index scan is slower than INT index scan |
| 80067 | 2016-01-20 10:50 | 2020-06-17 23:13 | MySQL Server: Optimizer | Verified (3157 days) | S3 | 5.6.28, 5.7.10 | Any | Any | Index on BIT column is NOT used when column name only is used in WHERE clause |
| 30342 | 2007-08-09 18:52 | 2015-10-07 14:54 | MySQL Server: Optimizer | Verified (3262 days) | S5 | 5.0.37, 5.6.17 | Any | Any | Equality propagation can make optimization much slower |
| 83062 | 2016-09-20 13:18 | 2018-04-24 20:15 | MySQL Server: Optimizer | Verified (2912 days) | S3 | 5.6.32, 5.7.14, 5.6.33, 5.7.15 | Any | Any | it's no longer possible to determine used key parts by looking at key_length |
| 83071 | 2016-09-21 8:02 | 2016-09-21 8:34 | MySQL Server: Optimizer | Verified (2912 days) | S3 | 5.7.14, 5.6.*, 5.7.15 | Any | Any | MySQL prefers first declared index over more useful other indexes |
| 83248 | 2016-10-03 15:57 | 2023-02-22 1:40 | MySQL Server: Optimizer | Verified (2900 days) | S3 | 8.0.0, 5.7.15 | Any | Any | Partition pruning is not working with LEFT JOIN |
| 83323 | 2016-10-10 18:02 | 2018-04-13 12:41 | MySQL Server: Optimizer | Verified (2697 days) | S3 | 5.7, 5.6, 8.0.1 | Any | Any | Optimizer chooses wrong plan when joining 2 tables |
| 86036 | 2017-04-21 10:08 | 2018-11-13 7:55 | MySQL Server: InnoDB storage engine | Verified (2698 days) | S3 | 5.7/8.0 | Any | Any | InnoDB FULLTEXT index has too strict innodb_ft_result_cache_limit max limit |
| 93360 | 2018-11-27 9:41 | 2018-12-12 14:48 | MySQL Server: Optimizer | Verified (2100 days) | S5 | 5.6.16,5.7.23 | Linux | x86 | mysterious optimizer behavior |
| 100885 | 2020-09-18 3:43 | 2020-11-09 11:38 | MySQL Server: JSON | Verified (1454 days) | S5 | 5.7.31 | Any | Any | generated column index against json column is not used with different encoding |
| 104978 | 2021-09-17 19:57 | 2021-09-20 9:02 | MySQL Server: Optimizer | Verified (1087 days) | S5 | 8.0.26, 5.7.35 | Windows | Any | Adding Join Index forces query optimizer to use inefficient execution plan |
| 106473 | 2022-02-16 8:55 | 2022-03-10 9:27 | MySQL Server: Optimizer | Verified (916 days) | S3 | 8.0.28 | Any | Any | Inner table of OUT-JOIN is nullable, after applying OUTER2INNER transformation |
| 99684 | 2020-05-25 12:19 | 2022-06-08 12:02 | MySQL Server: Optimizer | Verified (1567 days) | S3 | 5.6, 5.7, 8.0 | Any | Any | incorrect determination of big test |
| 108127 | 2022-08-12 5:57 | 2022-08-16 13:34 | MySQL Server: Optimizer | Verified (757 days) | S5 | 8.0.29 | Any | Any | MySQL optimizer chooses to a inefficient index . |
| 110117 | 2023-02-17 13:22 | 2023-02-17 15:32 | MySQL Server: Documentation | Verified (572 days) | S3 | 8.0 | Any | Any | Lack of instrumentation for index condition impact on the query plan |
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