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MWL#17: Table elimination

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mysql-test/r/table_elim.result:
  MWL#17: Table elimination
  - More tests
mysql-test/t/table_elim.test:
  MWL#17: Table elimination
  - More tests
sql/opt_table_elimination.cc:
  MWL#17: Table elimination
  - Code cleanup
sql/sql_select.cc:
  MWL#17: Table elimination
  - Code cleanup
sql/sql_select.h:
  MWL#17: Table elimination
  - Code cleanup
sql/table.h:
  MWL#17: Table elimination
  - Code cleanup
This commit is contained in:
Sergey Petrunya
2009-06-29 17:51:15 +04:00
parent d764108a2c
commit 9fa1bce436
6 changed files with 277 additions and 218 deletions
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7
sql/table.h
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@ -1616,7 +1616,10 @@ public:
typedef struct st_nested_join
{
List<TABLE_LIST> join_list; /* list of elements in the nested join */
table_map used_tables; /* bitmap of tables in the nested join */
/*
Bitmap of tables within this nested join (including those embedded within
its children). Eliminated tables are still in the bitmap */
table_map used_tables;
table_map not_null_tables; /* tables that rejects nulls */
struct st_join_table *first_nested;/* the first nested table in the plan */
/*
@ -1625,6 +1628,8 @@ typedef struct st_nested_join
2. check_interleaving_with_nj/restore_prev_nj_state (these are called
by the join optimizer.
Before each use the counters are zeroed by reset_nj_counters.
Meaning, in both cases: number of base tables within this nested join and
its children. Eliminated tables are not counted.
*/
uint counter;
/* Tables left after elimination */