database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-27 18:02:13 +03:00
Code Activity

MDEV-19588 Wrong results from query, using left join.

Browse Source 
This bug could happen when queries with nested outer joins were
executed employing join buffers. At such an execution if the method
JOIN_CACHE::join_records() is called when a join buffer has become
full no 'first_unmatched' field should be cleaned up in the JOIN_TAB
structure to which the join cache with this buffer is attached.
This commit is contained in:
Igor Babaev
2019-05-28 14:53:08 -07:00
parent 0955462d0a
commit eb09580b67
4 changed files with 102 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
sql/sql_join_cache.cc
View File

@ -2150,7 +2150,8 @@ enum_nested_loop_state JOIN_CACHE::join_records(bool skip_last)
}
finish:
if (outer_join_first_inner)
if (outer_join_first_inner &&
join_tab->first_inner == join_tab->first_unmatched)
{
/*
All null complemented rows have been already generated for all