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Bug #16792 query with subselect, join, and group not returning proper values

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Treat queries with no FROM and aggregate functions as normal queries,
so the aggregate function get correctly calculated as if there is 1 row. 
This means that they will be considered to have one row, so COUNT(*) will return
1 instead of 0. Other aggregates will behave in compatible manner.


mysql-test/r/func_gconcat.result:
  Bug #16792 query with subselect, join, and group not returning proper values
   - test case. Note how it improves the support for DUAL.
mysql-test/r/func_group.result:
  Bug #16792 query with subselect, join, and group not returning proper values
   - test case. Note how it improves the support for DUAL.
mysql-test/r/subselect.result:
  Bug #16792 query with subselect, join, and group not returning proper values
   - consequence of (SELECT MAX(<const>)) now returning <const> instead of 0
mysql-test/t/func_group.test:
  Bug #16792 query with subselect, join, and group not returning proper values
   - test case.
sql/opt_sum.cc:
  Bug #16792 query with subselect, join, and group not returning proper values
   - cannot do the optimization if the index is already opened by (say) UPDATE
     as it invloves opening reading and closing the index.
sql/sql_select.cc:
  Bug #16792 query with subselect, join, and group not returning proper values
   - Treat queries with no FROM and aggregate functions as normal queries,
  so the aggregate function get correctly calculated as if there is 1 row.
This commit is contained in:
unknown 2006-08-10 16:45:02 +03:00
parent 84ece59cef
commit d3dd6fa008
6 changed files with 55 additions and 15 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
mysql-test/r/func_gconcat.result
View file

@ -559,14 +559,14 @@ COUNT(*) GROUP_CONCAT(DISTINCT t2.somename SEPARATOR ' |')
DROP TABLE t1,t2;
select * from (select group_concat('c') from DUAL) t;
group_concat('c')
NULL
c
create table t1 ( a int not null default 0);
select * from (select group_concat(a) from t1) t2;
group_concat(a)
NULL
select group_concat('x') UNION ALL select 1;
group_concat('x')
NULL
x
1
drop table t1;
CREATE TABLE t1 (id int, a varchar(9));

24
mysql-test/r/func_group.result
View file

@ -794,7 +794,7 @@ min(7)
NULL
select min(7) from DUAL;
min(7)
NULL
7
explain select min(7) from t2m join t1m;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
@ -809,7 +809,7 @@ max(7)
NULL
select max(7) from DUAL;
max(7)
NULL
7
explain select max(7) from t2m join t1m;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
@ -848,7 +848,7 @@ min(7)
NULL
select min(7) from DUAL;
min(7)
NULL
7
explain select min(7) from t2i join t1i;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2i ALL NULL NULL NULL NULL 1
@ -864,7 +864,7 @@ max(7)
NULL
select max(7) from DUAL;
max(7)
NULL
7
explain select max(7) from t2i join t1i;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t2i ALL NULL NULL NULL NULL 1
@ -942,3 +942,19 @@ EXPLAIN SELECT MAX(b) FROM t1;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL NULL NULL NULL NULL 2
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (1,1),(1,2),(2,3);
SELECT (SELECT COUNT(DISTINCT t1.b)) FROM t1 GROUP BY t1.a;
(SELECT COUNT(DISTINCT t1.b))
1
1
SELECT (SELECT COUNT(DISTINCT 12)) FROM t1 GROUP BY t1.a;
(SELECT COUNT(DISTINCT 12))
1
1
SELECT AVG(2), BIT_AND(2), BIT_OR(2), BIT_XOR(2), COUNT(*), COUNT(12),
COUNT(DISTINCT 12), MIN(2),MAX(2),STD(2), VARIANCE(2),SUM(2),
GROUP_CONCAT(2),GROUP_CONCAT(DISTINCT 2);
AVG(2) BIT_AND(2) BIT_OR(2) BIT_XOR(2) COUNT(*) COUNT(12) COUNT(DISTINCT 12) MIN(2) MAX(2) STD(2) VARIANCE(2) SUM(2) GROUP_CONCAT(2) GROUP_CONCAT(DISTINCT 2)
2.0000 2 2 2 1 1 1 2 2 0.0000 0.0000 2 2 2
DROP TABLE t1;

4
mysql-test/r/subselect.result
View file

@ -1001,7 +1001,7 @@ INSERT INTO t1 VALUES (1);
UPDATE t1 SET i=i+1 WHERE i=(SELECT MAX(i));
select * from t1;
i
1
2
drop table t1;
CREATE TABLE t1 (a int(1));
EXPLAIN EXTENDED SELECT (SELECT RAND() FROM t1) FROM t1;
@ -1193,7 +1193,7 @@ UPDATE t1 SET t.i=i+(SELECT MAX(i) FROM (SELECT 1) t);
ERROR 42S02: Unknown table 't' in field list
select * from t1;
i
1
3
drop table t1;
CREATE TABLE t1 (
id int(11) default NULL

14
mysql-test/t/func_group.test
View file

@ -617,4 +617,18 @@ SELECT MAX(b) FROM t1;
EXPLAIN SELECT MAX(b) FROM t1;
DROP TABLE t1;
#
# Bug #16792 query with subselect, join, and group not returning proper values
#
CREATE TABLE t1 (a INT, b INT);
INSERT INTO t1 VALUES (1,1),(1,2),(2,3);
SELECT (SELECT COUNT(DISTINCT t1.b)) FROM t1 GROUP BY t1.a;
SELECT (SELECT COUNT(DISTINCT 12)) FROM t1 GROUP BY t1.a;
# an attempt to test all aggregate function with no table.
SELECT AVG(2), BIT_AND(2), BIT_OR(2), BIT_XOR(2), COUNT(*), COUNT(12),
COUNT(DISTINCT 12), MIN(2),MAX(2),STD(2), VARIANCE(2),SUM(2),
GROUP_CONCAT(2),GROUP_CONCAT(DISTINCT 2);
DROP TABLE t1;
# End of 4.1 tests

4
sql/opt_sum.cc
View file

@ -182,7 +182,7 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
Type of range for the key part for this field will be
returned in range_fl.
*/
if ((outer_tables & table->map) ||
if (table->file->inited || (outer_tables & table->map) ||
!find_key_for_maxmin(0, &ref, item_field->field, conds,
&range_fl, &prefix_len))
{
@ -269,7 +269,7 @@ int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds)
Type of range for the key part for this field will be
returned in range_fl.
*/
if ((outer_tables & table->map) ||
if (table->file->inited || (outer_tables & table->map) ||
!find_key_for_maxmin(1, &ref, item_field->field, conds,
&range_fl, &prefix_len))
{

14
sql/sql_select.cc
View file

@ -1131,7 +1131,7 @@ JOIN::exec()
DBUG_VOID_RETURN;
}
if (!tables_list)
if (!tables_list && (tables || !select_lex->with_sum_func))
{ // Only test of functions
if (select_options & SELECT_DESCRIBE)
select_describe(this, FALSE, FALSE, FALSE,
@ -1170,6 +1170,11 @@ JOIN::exec()
thd->examined_row_count= 0;
DBUG_VOID_RETURN;
}
/*
don't reset the found rows count if there're no tables
as FOUND_ROWS() may be called.
*/
if (tables)
thd->limit_found_rows= thd->examined_row_count= 0;
if (zero_result_cause)
@ -1209,7 +1214,8 @@ JOIN::exec()
having= tmp_having;
select_describe(this, need_tmp,
order != 0 && !skip_sort_order,
select_distinct);
select_distinct,
!tables ? "No tables used" : NullS);
DBUG_VOID_RETURN;
}
@ -6028,9 +6034,12 @@ do_select(JOIN *join,List<Item> *fields,TABLE *table,Procedure *procedure)
else
end_select=end_send;
}
if (join->tables)
{
join->join_tab[join->tables-1].next_select=end_select;
join_tab=join->join_tab+join->const_tables;
}
join->send_records=0;
if (join->tables == join->const_tables)
{
@ -6048,6 +6057,7 @@ do_select(JOIN *join,List<Item> *fields,TABLE *table,Procedure *procedure)
}
else
{
DBUG_ASSERT(join_tab);
error= sub_select(join,join_tab,0);
if (error >= 0)
error= sub_select(join,join_tab,1);