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Bug#11766594 59736: SELECT DISTINCT.. INCORRECT RESULT WITH DETERMINISTIC FUNCTION IN WHERE C

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There is an optimization of DISTINCT in JOIN::optimize()
which depends on THD::used_tables value. Each SELECT statement
inside SP resets used_tables value(see mysql_select()) and it
leads to wrong result. The fix is to replace THD::used_tables
with LEX::used_tables.
This commit is contained in:
Sergey Glukhov
2011-08-02 11:33:45 +04:00
parent 7841c3f574
commit de3693a1cd
10 changed files with 69 additions and 20 deletions
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7
sql/sql_class.h
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@@ -1734,13 +1734,6 @@ public:
*/
ha_rows examined_row_count;
/*
The set of those tables whose fields are referenced in all subqueries
of the query.
TODO: possibly this it is incorrect to have used tables in THD because
with more than one subquery, it is not clear what does the field mean.
*/
table_map used_tables;
USER_CONN *user_connect;
CHARSET_INFO *db_charset;
/*