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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
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4
mysql-test/r/func_gconcat.result
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@ -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));