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fixed bug of multi-level EXPLAIN

Browse source 
mysql-test/r/subselect.result:
  test of multi-level EXPLAIN
mysql-test/t/subselect.test:
  test of multi-level EXPLAIN
This commit is contained in:
unknown 2002-10-13 14:25:16 +03:00
parent 102cec1465
commit a299a27021
7 changed files with 25 additions and 4 deletions

8
mysql-test/r/subselect.result
View file

@ -159,6 +159,14 @@ UNIQUE KEY `email` (`email`)
INSERT INTO inscrit (pseudo,email) VALUES ('joce','test');
INSERT INTO inscrit (pseudo,email) VALUES ('joce1','test1');
INSERT INTO inscrit (pseudo,email) VALUES ('2joce1','2test1');
EXPLAIN SELECT pseudo,(SELECT email FROM inscrit WHERE pseudo=(SELECT
pseudo FROM inscrit WHERE pseudo='joce')) FROM inscrit WHERE pseudo=(SELECT
pseudo FROM inscrit WHERE pseudo='joce');
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY inscrit const PRIMARY PRIMARY 35 const 1
4 SUBSELECT inscrit const PRIMARY PRIMARY 35 const 1
2 SUBSELECT inscrit const PRIMARY PRIMARY 35 const 1
3 SUBSELECT inscrit const PRIMARY PRIMARY 35 const 1
SELECT pseudo FROM inscrit WHERE pseudo=(SELECT pseudo,email FROM
inscrit WHERE pseudo='joce');
Subselect returns more than 1 field

3
mysql-test/t/subselect.test
View file

@ -82,6 +82,9 @@ CREATE TABLE `inscrit` (
INSERT INTO inscrit (pseudo,email) VALUES ('joce','test');
INSERT INTO inscrit (pseudo,email) VALUES ('joce1','test1');
INSERT INTO inscrit (pseudo,email) VALUES ('2joce1','2test1');
EXPLAIN SELECT pseudo,(SELECT email FROM inscrit WHERE pseudo=(SELECT
pseudo FROM inscrit WHERE pseudo='joce')) FROM inscrit WHERE pseudo=(SELECT
pseudo FROM inscrit WHERE pseudo='joce');
-- error 1239
SELECT pseudo FROM inscrit WHERE pseudo=(SELECT pseudo,email FROM
inscrit WHERE pseudo='joce');

5
sql/item_subselect.cc
View file

@ -212,7 +212,7 @@ subselect_single_select_engine::subselect_single_select_engine(THD *thd,
select_subselect *result,
Item_subselect *item):
subselect_engine(thd, item, result),
executed(0), optimized(0)
prepared(0), optimized(0), executed(0)
{
select_lex= select;
SELECT_LEX_UNIT *unit= select_lex->master_unit();
@ -251,6 +251,9 @@ subselect_union_engine::subselect_union_engine(THD *thd,
int subselect_single_select_engine::prepare()
{
if (prepared)
return 0;
prepared= 1;
SELECT_LEX *save_select= thd->lex.select;
thd->lex.select= select_lex;
if(join->prepare((TABLE_LIST*) select_lex->table_list.first,

3
sql/item_subselect.h
View file

@ -179,8 +179,9 @@ public:
class subselect_single_select_engine: public subselect_engine
{
my_bool executed; /* simple subselect is executed */
my_bool prepared; /* simple subselect is prepared */
my_bool optimized; /* simple subselect is optimized */
my_bool executed; /* simple subselect is executed */
st_select_lex *select_lex; /* corresponding select_lex */
JOIN * join; /* corresponding JOIN structure */
public:

2
sql/sql_lex.cc
View file

@ -944,7 +944,7 @@ void st_select_lex_unit::init_query()
global_parameters= this;
select_limit_cnt= HA_POS_ERROR;
offset_limit_cnt= 0;
optimized= 0;
prepared= optimized= 0;
item= 0;
}

1
sql/sql_lex.h
View file

@ -227,6 +227,7 @@ protected:
select_result *result;
int res;
bool describe, found_rows_for_union,
prepared, //prepare phase already performed for UNION (unit)
optimized; // optimize phase already performed for UNION (unit)
public:
/*

7
sql/sql_union.cc
View file

@ -104,11 +104,16 @@ bool select_union::flush()
typedef JOIN * JOIN_P;
int st_select_lex_unit::prepare(THD *thd, select_result *result)
{
DBUG_ENTER("st_select_lex_unit::prepare");
if (prepared)
DBUG_RETURN(0);
prepared= 1;
describe=(first_select()->options & SELECT_DESCRIBE) ? 1 : 0;
res= 0;
found_rows_for_union= false;
TMP_TABLE_PARAM tmp_table_param;
DBUG_ENTER("st_select_lex_unit::prepare");
this->thd= thd;
this->result= result;
SELECT_LEX *lex_select_save= thd->lex.select;