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MWL#17: Table elimination

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- Post-postreview changes fix: Do set NESTED_JOIN::n_tables to number of 
  tables left after elimination.
This commit is contained in:
Sergey Petrunya 2009-08-13 13:24:02 +04:00
parent 40bb97b525
commit b3f18c8866
1 changed files with 7 additions and 5 deletions
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12
sql/sql_select.cc
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@ -114,7 +114,7 @@ static COND *simplify_joins(JOIN *join, List<TABLE_LIST> *join_list,
COND *conds, bool top);
static bool check_interleaving_with_nj(JOIN_TAB *next);
static void restore_prev_nj_state(JOIN_TAB *last);
static void reset_nj_counters(List<TABLE_LIST> *join_list);
static void reset_nj_counters(JOIN *join, List<TABLE_LIST> *join_list);
static uint build_bitmap_for_nested_joins(List<TABLE_LIST> *join_list,
uint first_unused);
@ -1011,7 +1011,7 @@ JOIN::optimize()
DBUG_RETURN(1);
}
reset_nj_counters(join_list);
reset_nj_counters(this, join_list);
make_outerjoin_info(this);
/*
@ -4625,7 +4625,7 @@ choose_plan(JOIN *join, table_map join_tables)
DBUG_ENTER("choose_plan");
join->cur_embedding_map= 0;
reset_nj_counters(join->join_list);
reset_nj_counters(join, join->join_list);
/*
if (SELECT_STRAIGHT_JOIN option is set)
reorder tables so dependent tables come after tables they depend
@ -8791,7 +8791,7 @@ static uint build_bitmap_for_nested_joins(List<TABLE_LIST> *join_list,
tables which will be ignored.
*/
static void reset_nj_counters(List<TABLE_LIST> *join_list)
static void reset_nj_counters(JOIN *join, List<TABLE_LIST> *join_list)
{
List_iterator<TABLE_LIST> li(*join_list);
TABLE_LIST *table;
@ -8802,7 +8802,9 @@ static void reset_nj_counters(List<TABLE_LIST> *join_list)
if ((nested_join= table->nested_join))
{
nested_join->counter= 0;
reset_nj_counters(&nested_join->join_list);
nested_join->n_tables= my_count_bits(nested_join->used_tables &
~join->eliminated_tables);
reset_nj_counters(join, &nested_join->join_list);
}
}
DBUG_VOID_RETURN;