Merge rolltop.ignatz42.dyndns.org:/mnt/storeage/bug20836/my41-bug20836

into  rolltop.ignatz42.dyndns.org:/mnt/storeage/bug20836/my50-bug20836


mysql-test/r/distinct.result:
  manual merge
mysql-test/t/distinct.test:
  manual merge
sql/sql_class.cc:
  manual merge
sql/sql_class.h:
  manual merge

1 files changed, 65 insertions, 0 deletions

diff --git a/mysql-test/t/distinct.test b/mysql-test/t/distinct.test
index e517380ba9b..b671d7b06cd 100644
--- a/mysql-test/t/distinct.test
+++ b/mysql-test/t/distinct.test
@@ -437,3 +437,68 @@ EXPLAIN SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;
 SELECT DISTINCT a,a FROM t1 WHERE b < 12 ORDER BY a;
 
 DROP TABLE t1;
+#
+#Bug #20836: Selecting into variables results in wrong results being returned
+#
+--disable_warnings
+DROP TABLE IF EXISTS t1;
+--enable_warnings
+
+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;
+
+SELECT DISTINCT fruit_id, fruit_name INTO @v3, @v4 FROM t1 GROUP BY fruit_id, 
+fruit_name HAVING fruit_name = 'APPLE';
+SELECT @v3, @v4;
+
+SELECT DISTINCT @v5:= fruit_id, @v6:= fruit_name INTO @v7, @v8 FROM t1 WHERE 
+fruit_name = 'APPLE';
+SELECT @v5, @v6, @v7, @v8;
+
+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;
+
+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;
+
+SELECT DISTINCT @v13, @v14 INTO @v15, @v16 FROM t1 WHERE fruit_name = 'APPLE';
+SELECT @v15, @v16;
+
+SELECT DISTINCT 2 + 2, 'Bob' INTO @v17, @v18 FROM t1 WHERE fruit_name = 
+'APPLE';
+SELECT @v17, @v18;
+
+--disable_warnings
+DROP TABLE IF EXISTS t2;
+--enable_warnings
+
+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;
+--exec rm $MYSQL_TEST_DIR/var/tmp/data1.tmp
+
+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;
+--exec rm $MYSQL_TEST_DIR/var/tmp/data2.tmp
+
+SELECT @v19, @v20;
+SELECT * FROM t2;
+
+DROP TABLE t1;
+DROP TABLE t2;
+