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Fixed bug #30396.

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The bug caused memory corruption for some queries with top OR level
in the WHERE condition if they contained equality predicates and 
other sargable predicates in disjunctive parts of the condition.

The corruption happened because the upper bound of the memory
allocated for KEY_FIELD and SARGABLE_PARAM internal structures
containing info about potential lookup keys was calculated incorrectly
in some cases. In particular it was calculated incorrectly when the
WHERE condition was an OR formula with disjuncts being AND formulas
including equalities and other sargable predicates.
This commit is contained in:
igor@olga.mysql.com
2007-08-15 10:24:18 -07:00
parent 1cc8f0e383
commit d790ec42e1
7 changed files with 133 additions and 28 deletions
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3
sql/sql_lex.h
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@ -533,7 +533,8 @@ public:
*/
uint select_n_having_items;
uint cond_count; /* number of arguments of and/or/xor in where/having/on */
uint between_count; /* number of between predicates in where/having/on */
uint between_count; /* number of between predicates in where/having/on */
uint max_equal_elems; /* maximal number of elements in multiple equalities */
/*
Number of fields used in select list or where clause of current select
and all inner subselects.