Type:
Task
Priority:
Major
Resolution:
Unresolved
Fix Version/s:
None
Component/s:
None
MDEV-26278 only considers derived tables having GROUP BY expressions. But if a derived table has SELECT DISTINCT this can also be considered as if table has a unique key on selected fields, and so can be a subject to elimination:
select t1.* from t1 left join ( select distinct a from t2) D on D.a=t1.a;
Also MDEV-26278 does not implement elimination for derived tables with UNION, though it seems possible:
select t1.* from t1 left join
( select distinct a from t2
union
select distinct a from t3) D
on D.a=t1.a;
relates to
MDEV-26278
Table elimination does not work across derived tables
Closed
Sergei Golubchik
made changes -
2022-06-15 13:15
Fix Version/s
10.11
[ 27614
]
Fix Version/s
10.10
[ 27530
]
Ralf Gebhardt
made changes -
2022-12-27 14:51
Fix Version/s
11.1
[ 28549
]
Fix Version/s
10.11
[ 27614
]
Ralf Gebhardt
made changes -
2023-05-04 18:53
Fix Version/s
11.3
[ 28565
]
Fix Version/s
11.1
[ 28549
]
Sergei Golubchik
made changes -
2023-09-17 17:53
Fix Version/s
11.4
[ 29301
]
Fix Version/s
11.3
[ 28565
]
Sergei Golubchik
made changes -
2023-10-30 20:10
Fix Version/s
11.5
[ 29506
]
Fix Version/s
11.4
[ 29301
]
Sergei Golubchik
made changes -
2024-03-19 18:32
Fix Version/s
11.6
[ 29515
]
Fix Version/s
11.5
[ 29506
]
Ralf Gebhardt
made changes -
2024-06-21 09:06
Fix Version/s
11.6
[ 29515
]
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