add partial query option flag

Author: scotthernandez

src/main/com/mongodb/Bytes.java

@@ -83,19 +83,28 @@ public class Bytes extends BSON {
      * Set this option to prevent that.
      */
     public static final int QUERYOPTION_NOTIMEOUT = 1 << 4;
+    
     /**
      * Use with TailableCursor.
      * If we are at the end of the data, block for a while rather than returning no data.
      * After a timeout period, we do return as normal.
      */
     public static final int QUERYOPTION_AWAITDATA = 1 << 5;
+    
     /**
      * Stream the data down full blast in multiple "more" packages, on the assumption that the client will fully read all data queried.
      * Faster when you are pulling a lot of data and know you want to pull it all down.
      * Note: the client is not allowed to not read all the data unless it closes the connection.
      */
     public static final int QUERYOPTION_EXHAUST = 1 << 6;
 
+    /** 
+     * Use with sharding (mongos).
+     * Allows partial results from a sharded system if any shards are down/missing from the cluster. If not used an error will be returned
+     * from the mongos server.
+     */
+    public static final int QUERYOPTION_PARTIAL = 1 << 7;
+
     /**
      * Set when getMore is called but the cursor id is not valid at the server.
      * Returned with zero results. 
@@ -118,6 +127,7 @@ public class Bytes extends BSON {
      */
     public static final int RESULTFLAG_AWAITCAPABLE = 8;
 
+
     static class OptionHolder {
         OptionHolder( OptionHolder parent ){
             _parent = parent;