Merging from mysql-5.1 to mysql-5.5.

sql/handler.cc

@@ -4655,7 +4655,19 @@ int handler::read_range_first(const key_range *start_key,
 		? HA_ERR_END_OF_FILE
 		: result);
 
-  DBUG_RETURN (compare_key(end_range) <= 0 ? 0 : HA_ERR_END_OF_FILE);
+  if (compare_key(end_range) <= 0)
+  {
+    DBUG_RETURN(0);
+  }
+  else
+  {
+    /*
+      The last read row does not fall in the range. So request
+      storage engine to release row lock if possible.
+    */
+    unlock_row();
+    DBUG_RETURN(HA_ERR_END_OF_FILE);
+  }
 }
 
 
@@ -4687,7 +4699,20 @@ int handler::read_range_next()
   result= index_next(table->record[0]);
   if (result)
     DBUG_RETURN(result);
-  DBUG_RETURN(compare_key(end_range) <= 0 ? 0 : HA_ERR_END_OF_FILE);
+
+  if (compare_key(end_range) <= 0)
+  {
+    DBUG_RETURN(0);
+  }
+  else
+  {
+    /*
+      The last read row does not fall in the range. So request
+      storage engine to release row lock if possible.
+    */
+    unlock_row();
+    DBUG_RETURN(HA_ERR_END_OF_FILE);
+  }
 }