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merge

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sql/item_func.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
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unknown
2004-03-16 08:32:21 +02:00
parent c7fd1fa496 9b641be993
commit cecf1965be
5 changed files with 23 additions and 3 deletions
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8
mysql-test/r/subselect.result
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@ -1630,3 +1630,11 @@ select count(*) from t1 as w1 where w1.val in (select w2.val from t1 as w2 where
count(*)
0
drop table if exists t1;
create table t1 (a int);
insert into t1 values (1);
explain select benchmark(1000, (select a from t1 where a=sha(rand())));
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
2 UNCACHEABLE SUBQUERY t1 system NULL NULL NULL NULL 1
drop table t1;

8
mysql-test/t/subselect.test
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@ -1073,3 +1073,11 @@ create table t1(val varchar(10));
insert into t1 values ('aaa'), ('bbb'),('eee'),('mmm'),('ppp');
select count(*) from t1 as w1 where w1.val in (select w2.val from t1 as w2 where w2.val like 'm%') and w1.val in (select w3.val from t1 as w3 where w3.val like 'e%');
drop table if exists t1;
#
# Static tables & rund() in subqueries
#
create table t1 (a int);
insert into t1 values (1);
explain select benchmark(1000, (select a from t1 where a=sha(rand())));
drop table t1;

1
sql/item_func.cc
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@ -954,6 +954,7 @@ void Item_func_rand::fix_length_and_dec()
{
decimals=NOT_FIXED_DEC;
max_length=float_length(decimals);
used_tables_cache|= RAND_TABLE_BIT;
if (arg_count)
{ // Only use argument once in query
uint32 tmp= (uint32) (args[0]->val_int());

1
sql/item_func.h
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@ -512,7 +512,6 @@ public:
double val();
const char *func_name() const { return "rand"; }
bool const_item() const { return 0; }
table_map used_tables() const { return RAND_TABLE_BIT; }
void fix_length_and_dec();
};

8
sql/sql_select.cc
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@ -584,7 +584,9 @@ JOIN::optimize()
DBUG_RETURN(1); // error == -1
}
if (const_table_map != found_const_table_map &&
!(select_options & SELECT_DESCRIBE))
!(select_options & SELECT_DESCRIBE) &&
!((conds->used_tables() & RAND_TABLE_BIT) &&
select_lex->master_unit() != &thd->lex->unit))// not upper level SELECT
{
zero_result_cause= "no matching row in const table";
DBUG_PRINT("error",("Error: %s", zero_result_cause));
@ -3407,7 +3409,9 @@ make_join_select(JOIN *join,SQL_SELECT *select,COND *cond)
table_map used_tables;
if (join->tables > 1)
cond->update_used_tables(); // Tablenr may have changed
if (join->const_tables == join->tables)
if (join->const_tables == join->tables &&
join->thd->lex->current_select->master_unit() ==
&join->thd->lex->unit) // not upper level SELECT
join->const_table_map|=RAND_TABLE_BIT;
{ // Check const tables
COND *const_cond=