diff --git a/mysql-test/r/select.result b/mysql-test/r/select.result
index 06b72b993ff..481057c751c 100644
--- a/mysql-test/r/select.result
+++ b/mysql-test/r/select.result
@@ -2401,3 +2401,25 @@ id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
 1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	5	
 1	SIMPLE	t2	ref	a	a	23	test.t1.a	2	
 DROP TABLE t1, t2;
+CREATE TABLE t1 ( city char(30) );
+INSERT INTO t1 VALUES ('London');
+INSERT INTO t1 VALUES ('Paris');
+SELECT * FROM t1 WHERE city='London';
+city
+London
+SELECT * FROM t1 WHERE city='london';
+city
+London
+EXPLAIN SELECT * FROM t1 WHERE city='London' AND city='london';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT * FROM t1 WHERE city='London' AND city='london';
+city
+London
+EXPLAIN SELECT * FROM t1 WHERE city LIKE '%london%' AND city='London';
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	2	Using where
+SELECT * FROM t1 WHERE city LIKE '%london%' AND city='London';
+city
+London
+DROP TABLE t1;
diff --git a/mysql-test/t/select.test b/mysql-test/t/select.test
index 13b3e792055..4c761c8d0f3 100644
--- a/mysql-test/t/select.test
+++ b/mysql-test/t/select.test
@@ -1985,3 +1985,22 @@ EXPLAIN SELECT * FROM t1 LEFT JOIN t2 USE INDEX (a) ON t1.a=t2.a;
 EXPLAIN SELECT * FROM t1 LEFT JOIN t2 FORCE INDEX (a) ON t1.a=t2.a;
 
 DROP TABLE t1, t2;
+
+
+#
+# Test case for bug 7098: substitution of a constant for a string field 
+#
+
+CREATE TABLE t1 ( city char(30) );
+INSERT INTO t1 VALUES ('London');
+INSERT INTO t1 VALUES ('Paris');
+
+SELECT * FROM t1 WHERE city='London';
+SELECT * FROM t1 WHERE city='london';
+EXPLAIN SELECT * FROM t1 WHERE city='London' AND city='london';
+SELECT * FROM t1 WHERE city='London' AND city='london';
+EXPLAIN SELECT * FROM t1 WHERE city LIKE '%london%' AND city='London';
+SELECT * FROM t1 WHERE city LIKE '%london%' AND city='London';
+
+DROP TABLE t1;
+
diff --git a/sql/item.h b/sql/item.h
index 7d9526b53a8..3e1844ec76e 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -985,7 +985,7 @@ public:
   Item *new_item() 
   {
     return new Item_string(name, str_value.ptr(), 
-    			   str_value.length(), &my_charset_bin);
+    			   str_value.length(), collation.collation);
   }
   Item *safe_charset_converter(CHARSET_INFO *tocs);
   String *const_string() { return &str_value; }