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BUG#860553: Crash in create_ref_for_key with semijoin + materialization

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- The problem was that JOIN::save/restore_query_plan() did not save/restore parts of 
  the query plan that are located inside SJ_MATERIALIZATION_INFO structures. This could
  cause parts of one plan to be used with another, which led get_best_combination() to
  constructing non-sensical join plans (and crash).
  Fixed by saving/restoring SJM parts of the query plans.

- check_and_do_in_subquery_rewrites() will not set SUBS_MATERIALIZATION flag when it 
  records that the subquery predicate is to be converted into semi-join. 
  If convert_join_subqueries_to_semijoins() later decides not to convert to semi-join,
  let it set SUBS_MATERIALIZATION flag, if appropriate.
This commit is contained in:
Sergey Petrunya
2011-10-01 00:10:03 +04:00
parent 134e417895
commit f5987a0c3e
7 changed files with 183 additions and 51 deletions
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1
sql/sql_select.h
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@ -666,6 +666,7 @@ protected:
KEYUSE *join_tab_keyuse[MAX_TABLES];
/* Copies of JOIN_TAB::checked_keys for each JOIN_TAB. */
key_map join_tab_checked_keys[MAX_TABLES];
SJ_MATERIALIZATION_INFO *sj_mat_info[MAX_TABLES];
public:
Join_plan_state()
{