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Bug#20836 Selecting into variables results in wrong results being returned

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This error is displayed anytime the SELECT statement needs a temp table to
return correct results because the object (select_dumpvar) that represents
variables named in the INTO clause stored the results before the temp
table was considered.  The problem was fixed by creating the necessary
Item_func_set_user_var objects once the correct data is ready.


mysql-test/r/distinct.result:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Added results
mysql-test/t/distinct.test:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Added various Selects that use the INTO statement and a temp table.
  - Added Select Into Outfile variant tests also.
sql/sql_class.cc:
  Bug#20836 Selecting into variables results in wrong results being returned
  - The select_dumpvar variable created a Item_func_set_user_var too early
  and once set, it was not possible to change.  The Item_func_set_user_var
  is now created once the final results are available.
sql/sql_class.h:
  Bug#20836 Selecting into variables results in wrong results being returned
  - Removed unnecessary object members.
This commit is contained in:
unknown
2006-11-28 17:21:39 -05:00
parent 870b2e0a2b
commit b4aab15272
4 changed files with 147 additions and 28 deletions
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59
mysql-test/r/distinct.result
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@ -566,3 +566,62 @@ a b
3 2
2 3
DROP TABLE t1;
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (id INT NOT NULL, fruit_id INT NOT NULL, fruit_name varchar(20)
default NULL);
INSERT INTO t1 VALUES (1,1,'ORANGE');
INSERT INTO t1 VALUES (2,2,'APPLE');
INSERT INTO t1 VALUES (3,2,'APPLE');
INSERT INTO t1 VALUES (4,3,'PEAR');
SELECT DISTINCT fruit_id, fruit_name INTO @v1, @v2 FROM t1 WHERE fruit_name =
'APPLE';
SELECT @v1, @v2;
@v1 @v2
2 APPLE
SELECT DISTINCT fruit_id, fruit_name INTO @v3, @v4 FROM t1 GROUP BY fruit_id,
fruit_name HAVING fruit_name = 'APPLE';
SELECT @v3, @v4;
@v3 @v4
2 APPLE
SELECT DISTINCT @v5:= fruit_id, @v6:= fruit_name INTO @v7, @v8 FROM t1 WHERE
fruit_name = 'APPLE';
SELECT @v5, @v6, @v7, @v8;
@v5 @v6 @v7 @v8
2 APPLE 2 APPLE
SELECT DISTINCT @v5 + fruit_id, CONCAT(@v6, fruit_name) INTO @v9, @v10 FROM t1
WHERE fruit_name = 'APPLE';
SELECT @v5, @v6, @v7, @v8, @v9, @v10;
@v5 @v6 @v7 @v8 @v9 @v10
2 APPLE 2 APPLE 4 APPLEAPPLE
SELECT DISTINCT @v11:= @v5 + fruit_id, @v12:= CONCAT(@v6, fruit_name) INTO
@v13, @v14 FROM t1 WHERE fruit_name = 'APPLE';
SELECT @v11, @v12, @v13, @v14;
@v11 @v12 @v13 @v14
4 APPLEAPPLE 4 APPLEAPPLE
SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
SELECT @v15, @v16;
@v15 @v16
4 APPLEAPPLE
SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name =
'APPLE';
SELECT @v17, @v18;
@v17 @v18
4 Bob
DROP TABLE IF EXISTS t2;
CREATE TABLE t2 (fruit_id INT NOT NULL, fruit_name varchar(20)
default NULL);
SELECT DISTINCT fruit_id, fruit_name INTO OUTFILE
'../tmp/data1.tmp' FROM t1 WHERE fruit_name = 'APPLE';
LOAD DATA INFILE '../tmp/data1.tmp' INTO TABLE t2;
SELECT DISTINCT @v19:= fruit_id, @v20:= fruit_name INTO OUTFILE
'../tmp/data2.tmp' FROM t1 WHERE fruit_name = 'APPLE';
LOAD DATA INFILE '../tmp/data2.tmp' INTO TABLE t2;
SELECT @v19, @v20;
@v19 @v20
2 APPLE
SELECT * FROM t2;
fruit_id fruit_name
2 APPLE
2 APPLE
DROP TABLE t1;
DROP TABLE t2;