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Fixed bug #19579: at range analysis optimizer did not take into

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account predicates that become sargable after reading const tables.
In some cases this resulted in choosing non-optimal execution plans.
Now info of such potentially saragable predicates is saved in
an array and after reading const tables we check whether this
predicates has become saragable.
This commit is contained in:
igor@rurik.mysql.com 2006-10-16 14:25:28 -07:00
commit c467be8d6e
7 changed files with 238 additions and 35 deletions
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sql/sql_lex.cc
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@ -1138,7 +1138,7 @@ void st_select_lex::init_query()
initialization is checked for failure.
*/
parent_lex->push_context(&context);
cond_count= with_wild= 0;
cond_count= between_count= with_wild= 0;
conds_processed_with_permanent_arena= 0;
ref_pointer_array= 0;
select_n_having_items= 0;