bug#25746 ndb: 4209 error with 2 VARCHAR primary keys

- make sure keys are copied correctly when varchar has 2 length bytes
- test case


mysql-test/r/ndb_basic.result:
  bug#25746 ndb: 4209 error with 2 VARCHAR primary keys
  - test case
mysql-test/t/ndb_basic.test:
  bug#25746 ndb: 4209 error with 2 VARCHAR primary keys
  - test case
sql/ha_ndbcluster.cc:
  bug#25746 ndb: 4209 error with 2 VARCHAR primary keys
  - make sure keys are copied correctly when varchar has 2 length bytes

mysql-test/r/ndb_basic.result

@@ -749,3 +749,19 @@ f1	f2	f3
 222222	bbbbbb	2
 drop table t1;
 Illegal ndb error code: 1186
+CREATE TABLE t1 (
+a VARBINARY(40) NOT NULL,
+b VARCHAR (256) CHARACTER SET UTF8 NOT NULL,
+c VARCHAR(256) CHARACTER SET UTF8 NOT NULL,
+PRIMARY KEY (b,c))  ENGINE=ndbcluster;
+INSERT INTO t1 VALUES
+("a","ab","abc"),("b","abc","abcd"),("c","abc","ab"),("d","ab","ab"),("e","abc","abc");
+SELECT * FROM t1 ORDER BY a;
+a	b	c
+a	ab	abc
+b	abc	abcd
+c	abc	ab
+d	ab	ab
+e	abc	abc
+DROP TABLE t1;
+End of 5.0 tests

mysql-test/t/ndb_basic.test

@@ -710,3 +710,22 @@ drop table t1;
 --error 1
 --exec $MY_PERROR --ndb 1186 2>&1
 
+#
+# Bug #25746 - VARCHAR UTF8 PK issue
+# - prior to bugfix 4209, illegal length parameter would be 
+# returned in SELECT *
+
+CREATE TABLE t1 (
+a VARBINARY(40) NOT NULL,
+b VARCHAR (256) CHARACTER SET UTF8 NOT NULL,
+c VARCHAR(256) CHARACTER SET UTF8 NOT NULL,
+PRIMARY KEY (b,c))  ENGINE=ndbcluster;
+INSERT INTO t1 VALUES
+("a","ab","abc"),("b","abc","abcd"),("c","abc","ab"),("d","ab","ab"),("e","abc","abc");
+SELECT * FROM t1 ORDER BY a;
+DROP TABLE t1;
+
+# End of 5.0 tests
+--echo End of 5.0 tests
+
+

sql/ha_ndbcluster.cc

@@ -3144,8 +3144,9 @@ void ha_ndbcluster::position(const byte *record)
       size_t len = key_part->length;
       const byte * ptr = record + key_part->offset;
       Field *field = key_part->field;
-      if ((field->type() ==  MYSQL_TYPE_VARCHAR) &&
-	  ((Field_varstring*)field)->length_bytes == 1)
+      if (unlikely(field->type() ==  MYSQL_TYPE_VARCHAR))
+      {
+        if (((Field_varstring*)field)->length_bytes == 1)
         {
           /**
            * Keys always use 2 bytes length
@@ -3153,6 +3154,11 @@ void ha_ndbcluster::position(const byte *record)
           buff[0] = ptr[0];
           buff[1] = 0;
           memcpy(buff+2, ptr + 1, len);
+        }
+        else
+        {
+          memcpy(buff, ptr, len + 2);
+        }
         len += 2;
       }
       else