WL# 1728 Handler: use scanReadExclusive for scan update and delete

sql/ha_ndbcluster.cc:
  Modified next_result to process fetched records cached in NdbApi before asking NDB for more. 
  It should also NoCommit any pending operations before contacting NDB again.
  Added utility function define_read_attrs to set the fields that should be read.
sql/ha_ndbcluster.h:
  Add function define_read_attrs, used to set the fields to read
  Add get_nd_lock_type funciton ,to convert MySQL lock type to NDB lock type
  Always compile filtered scan function even if it's not used yet.
  Add variable ops_pending to keep track of "pending" update/delete operations.

sql/ha_ndbcluster.h

@@ -152,6 +152,7 @@ class ha_ndbcluster: public handler
   const char* get_unique_index_name(uint idx_no) const;
   NDB_INDEX_TYPE get_index_type(uint idx_no) const;
   NDB_INDEX_TYPE get_index_type_from_table(uint index_no) const;
+  int get_ndb_lock_type();
   
   int pk_read(const byte *key, uint key_len, 
 	      byte *buf);
@@ -162,12 +163,10 @@ class ha_ndbcluster: public handler
 			 bool sorted, byte* buf);
   int full_table_scan(byte * buf);
   int next_result(byte *buf); 
-#if 0
+  int define_read_attrs(byte* buf, NdbOperation* op);
   int filtered_scan(const byte *key, uint key_len, 
 		    byte *buf,
 		    enum ha_rkey_function find_flag);
-#endif
-
   void unpack_record(byte *buf);
 
   void set_dbname(const char *pathname);
@@ -212,6 +211,7 @@ class ha_ndbcluster: public handler
   ha_rows rows_to_insert;
   ha_rows rows_inserted;
   ha_rows bulk_insert_rows;
+  ha_rows ops_pending;
 };
 
 bool ndbcluster_init(void);