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Merge mysql.com:/home/hf/work/29717/my41-29717

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into  mysql.com:/home/hf/work/29717/my50-29717


mysql-test/t/insert_select.test:
  Auto merged
sql/sql_select.cc:
  Auto merged
mysql-test/r/group_by.result:
  merging
mysql-test/r/insert_select.result:
  merging
mysql-test/t/group_by.test:
  merging
sql/sql_select.h:
  merging
This commit is contained in:
unknown 2007-07-31 11:03:31 +05:00
commit 2dc02f2424
4 changed files with 62 additions and 1 deletions
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22
mysql-test/t/group_by.test
View file

@ -633,6 +633,28 @@ SELECT a FROM t1 ORDER BY "a" DESC;
SELECT a FROM t1 ORDER BY `a` DESC;
DROP TABLE t1;
#
# Bug #29717 INSERT INTO SELECT inserts values even if SELECT statement itself
# returns empty
#
CREATE TABLE t1 (
f1 int(10) unsigned NOT NULL auto_increment primary key,
f2 varchar(100) NOT NULL default ''
);
CREATE TABLE t2 (
f1 varchar(10) NOT NULL default '',
f2 char(3) NOT NULL default '',
PRIMARY KEY (`f1`),
KEY `k1` (`f2`,`f1`)
);
INSERT INTO t1 values(NULL, '');
INSERT INTO `t2` VALUES ('486878','WDT'),('486910','WDT');
SELECT SQL_BUFFER_RESULT avg(t2.f1) FROM t1, t2 where t2.f2 = 'SIR' GROUP BY t1.f1;
SELECT avg(t2.f1) FROM t1, t2 where t2.f2 = 'SIR' GROUP BY t1.f1;
DROP TABLE t1, t2;
# End of 4.1 tests
#

28
mysql-test/t/insert_select.test
View file

@ -239,6 +239,34 @@ show status like 'Handler_read%';
DROP TABLE t1;
#
# Bug #29717 INSERT INTO SELECT inserts values even if SELECT statement itself returns empty
#
CREATE TABLE t1 (
f1 int(10) unsigned NOT NULL auto_increment PRIMARY KEY,
f2 varchar(100) NOT NULL default ''
);
CREATE TABLE t2 (
f1 varchar(10) NOT NULL default '',
f2 char(3) NOT NULL default '',
PRIMARY KEY (`f1`),
KEY `k1` (`f2`, `f1`)
);
INSERT INTO t1 values(NULL, '');
INSERT INTO `t2` VALUES ('486878','WDT'),('486910','WDT');
SELECT COUNT(*) FROM t1;
SELECT min(t2.f1) FROM t1, t2 where t2.f2 = 'SIR' GROUP BY t1.f1;
INSERT INTO t1 (f2)
SELECT min(t2.f1) FROM t1, t2 where t2.f2 = 'SIR' GROUP BY t1.f1;
SELECT COUNT(*) FROM t1;
SELECT * FROM t1;
DROP TABLE t1, t2;
# End of 4.1 tests
#

4
sql/sql_select.cc
View file

@ -1121,6 +1121,7 @@ JOIN::optimize()
order=0; // The output has only one row
simple_order=1;
select_distinct= 0; // No need in distinct for 1 row
group_optimized_away= 1;
}
calc_group_buffer(this, group_list);
@ -11461,7 +11462,8 @@ end_send_group(JOIN *join, JOIN_TAB *join_tab __attribute__((unused)),
if (!join->first_record || end_of_records ||
(idx=test_if_group_changed(join->group_fields)) >= 0)
{
if (join->first_record || (end_of_records && !join->group))
if (join->first_record ||
(end_of_records && !join->group && !join->group_optimized_away))
{
if (join->procedure)
join->procedure->end_group();

9
sql/sql_select.h
View file

@ -282,6 +282,14 @@ public:
ROLLUP rollup; // Used with rollup
bool select_distinct; // Set if SELECT DISTINCT
/*
If we have the GROUP BY statement in the query,
but the group_list was emptied by optimizer, this
flag is TRUE.
It happens when fields in the GROUP BY are from
constant table
*/
bool group_optimized_away;
/*
simple_xxxxx is set if ORDER/GROUP BY doesn't include any references
@ -390,6 +398,7 @@ public:
zero_result_cause= 0;
optimized= 0;
cond_equal= 0;
group_optimized_away= 0;
all_fields= fields_arg;
fields_list= fields_arg;