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

Fixed bug #54539.

Browse Source 
Added a possibility not to factor out the condition pushed to
the access index out of the condition pushed to a joined table.
This is useful for the condition pushed to the index when a hashed
join buffer for BKA is employed. In this case the index condition
may be false for some, but for all records with the same key.
So the condition must be checked not only after index lookup,
but after fetching row data as well, and it makes sense not to 
factor out the condition from the condition checked after reading
row data,
The bug happened because the condition pushed to an index always
was factor out from the condition pushed to the accessed table.
This commit is contained in:
Igor Babaev
2010-10-01 10:08:10 -07:00
parent 21b1b5f040
commit 1320f6073c
5 changed files with 91 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
sql/sql_select.h
View File

@ -2449,7 +2449,8 @@ inline bool optimizer_flag(THD *thd, uint flag)
void eliminate_tables(JOIN *join);
/* Index Condition Pushdown entry point function */
void push_index_cond(JOIN_TAB *tab, uint keyno, bool other_tbls_ok);
void push_index_cond(JOIN_TAB *tab, uint keyno, bool other_tbls_ok,
bool factor_out);
/****************************************************************************
Temporary table support for SQL Runtime