Bug#50389 Using intersect does not return all rows

In process of record search it is not taken into account
that inital quick->file->ref value could be inapplicable
to range interval. After proper row is found this value is
stored into the record buffer and later the record is
filtered out at condition evaluation stage.
The fix is store a refernce of found row to the handler ref field.

mysql-test/r/innodb_mysql.result

@@ -2417,4 +2417,42 @@ ENGINE=InnoDB;
 INSERT INTO t1 VALUES (0, 77, 1, 3);
 UPDATE t1 SET d = 0 WHERE b = 77 AND c = 25;
 DROP TABLE t1;
+#
+# Bug#50389 Using intersect does not return all rows
+#
+CREATE TABLE t1 (
+f1 INT(10) NOT NULL,
+f2 INT(10),
+f3 INT(10),
+f4 TINYINT(4),
+f5 VARCHAR(50),
+PRIMARY KEY (f1),
+KEY idx1 (f2,f5,f4),
+KEY idx2 (f2,f4)
+) ENGINE=InnoDB;
+LOAD DATA INFILE '../../std_data/intersect-bug50389.tsv' INTO TABLE t1;
+SELECT * FROM t1 WHERE f1 IN
+(3305028,3353871,3772880,3346860,4228206,3336022,
+3470988,3305175,3329875,3817277,3856380,3796193,
+3784744,4180925,4559596,3963734,3856391,4494153)
+AND f5 = 'abcdefghijklmnopwrst' AND f2 = 1221457 AND f4 = 0 ;
+f1	f2	f3	f4	f5
+3305175	1221457	0	0	abcdefghijklmnopwrst
+3329875	1221457	1382427	0	abcdefghijklmnopwrst
+3336022	1221457	0	0	abcdefghijklmnopwrst
+3346860	1221457	0	0	abcdefghijklmnopwrst
+3772880	1221457	0	0	abcdefghijklmnopwrst
+3784744	1221457	1382427	0	abcdefghijklmnopwrst
+3796193	1221457	0	0	abcdefghijklmnopwrst
+4228206	1221457	0	0	abcdefghijklmnopwrst
+4494153	1221457	0	0	abcdefghijklmnopwrst
+4559596	1221457	0	0	abcdefghijklmnopwrst
+EXPLAIN SELECT * FROM t1 WHERE f1 IN
+(3305028,3353871,3772880,3346860,4228206,3336022,
+3470988,3305175,3329875,3817277,3856380,3796193,
+3784744,4180925,4559596,3963734,3856391,4494153)
+AND f5 = 'abcdefghijklmnopwrst' AND f2 = 1221457 AND f4 = 0 ;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	index_merge	PRIMARY,idx1,idx2	idx2,idx1,PRIMARY	7,60,4	NULL	1	Using intersect(idx2,idx1,PRIMARY); Using where
+DROP TABLE t1;
 End of 5.1 tests

mysql-test/t/innodb_mysql.test

@@ -663,4 +663,35 @@ UPDATE t1 SET d = 0 WHERE b = 77 AND c = 25;
 
 DROP TABLE t1;
 
+--echo #
+--echo # Bug#50389 Using intersect does not return all rows
+--echo #
+
+CREATE TABLE t1 (
+  f1 INT(10) NOT NULL,
+  f2 INT(10),
+  f3 INT(10),
+  f4 TINYINT(4),
+  f5 VARCHAR(50),
+  PRIMARY KEY (f1),
+  KEY idx1 (f2,f5,f4),
+  KEY idx2 (f2,f4)
+) ENGINE=InnoDB;
+
+LOAD DATA INFILE '../../std_data/intersect-bug50389.tsv' INTO TABLE t1;
+
+SELECT * FROM t1 WHERE f1 IN
+(3305028,3353871,3772880,3346860,4228206,3336022,
+ 3470988,3305175,3329875,3817277,3856380,3796193,
+ 3784744,4180925,4559596,3963734,3856391,4494153)
+AND f5 = 'abcdefghijklmnopwrst' AND f2 = 1221457 AND f4 = 0 ;
+
+EXPLAIN SELECT * FROM t1 WHERE f1 IN
+(3305028,3353871,3772880,3346860,4228206,3336022,
+ 3470988,3305175,3329875,3817277,3856380,3796193,
+ 3784744,4180925,4559596,3963734,3856391,4494153)
+AND f5 = 'abcdefghijklmnopwrst' AND f2 = 1221457 AND f4 = 0 ;
+
+DROP TABLE t1;
+
 --echo End of 5.1 tests

sql/opt_range.cc

@@ -8349,6 +8349,7 @@ int QUICK_ROR_INTERSECT_SELECT::get_next()
             if ((error= quick->get_next()))
               DBUG_RETURN(error);
           }
+          quick->file->position(quick->record);
         }
         memcpy(last_rowid, quick->file->ref, head->file->ref_length);
         last_rowid_count= 1;