Fixed prototype of get_error_message to use String to return error message

WL#1747 and #1746 allow user to decide if ordered index should be created or not


BitKeeper/deleted/.del-AttrType.hpp~a9b2d6efcf660378:
  Delete: ndb/include/ndbapi/AttrType.hpp
sql/ha_ndbcluster.cc:
  Removed the NDB_ERR_CODE_OFFSET, ndb and handler error codes should not clash
  Encapsulated functionality to cache information about known indexes into buil_index_list
  Added detection of algorithm from key_info in function get_index_type_from_table
  Updated read_range_first and records_in_range to work wih new prototype.
sql/ha_ndbcluster.h:
  WL#1746 and WL#1747 Added ability to skip creating an ordered index in addition to the hash index if the user so wishes.
  Modified get_error_message to return error messaga in a String datatype, in that way the String class will take care of wheter the "data" has to be freed or not.
sql/handler.cc:
  Use String datatype as ouput parameter of get_error_message.
sql/handler.h:
  Changed the function prototype for getting error messages from handler to use String datataype

sql/ha_ndbcluster.h

@@ -37,8 +37,10 @@ class NdbResultSet;    // Forward declaration
 typedef enum ndb_index_type {
   UNDEFINED_INDEX = 0,
   PRIMARY_KEY_INDEX = 1,
-  UNIQUE_INDEX = 2,
-  ORDERED_INDEX = 3
+  PRIMARY_KEY_ORDERED_INDEX = 2,
+  UNIQUE_INDEX = 3,
+  UNIQUE_ORDERED_INDEX = 4,
+  ORDERED_INDEX = 5
 } NDB_INDEX_TYPE;
 
 
@@ -78,10 +80,10 @@ class ha_ndbcluster: public handler
   void position(const byte *record);
   int read_range_first(const key_range *start_key,
 		       const key_range *end_key,
-		       bool sorted);
-  int read_range_next(bool eq_range);
+		       bool eq_range, bool sorted);
+  int read_range_next();
 
-  const char* get_error_message(int *error, bool *temporary);
+  bool get_error_message(int error, String *buf);
   void info(uint);
   int extra(enum ha_extra_function operation);
   int extra_opt(enum ha_extra_function operation, ulong cache_size);
@@ -117,6 +119,8 @@ class ha_ndbcluster: public handler
   const char* index_type(uint key_number) {
     switch (get_index_type(key_number)) {
     case ORDERED_INDEX:
+    case UNIQUE_ORDERED_INDEX:
+    case PRIMARY_KEY_ORDERED_INDEX:
       return "BTREE";
     case UNIQUE_INDEX:
     case PRIMARY_KEY_INDEX:
@@ -141,6 +145,7 @@ class ha_ndbcluster: public handler
   int create_ordered_index(const char *name, KEY *key_info);
   int create_unique_index(const char *name, KEY *key_info);
   int initialize_autoincrement(const void* table);
+  int build_index_list();
   int get_metadata(const char* path);
   void release_metadata();
   const char* get_index_name(uint idx_no) const;

sql/handler.cc

@@ -1123,14 +1123,15 @@ void handler::print_error(int error, myf errflag)
       /* The error was "unknown" to this function.
 	 Ask handler if it has got a message for this error */
       bool temporary= FALSE;
-      const char* msg= get_error_message(&error, &temporary);
-      if (msg)
+      String str;
+      temporary= get_error_message(error, &str);
+      if (!str.is_empty())
       {
 	const char* engine= ha_get_storage_engine(table->db_type);
 	if (temporary)
-	  my_error(ER_GET_TEMPORARY_ERRMSG,MYF(0),error,msg,engine);
+	  my_error(ER_GET_TEMPORARY_ERRMSG,MYF(0),error,str.ptr(),engine);
 	else
-	  my_error(ER_GET_ERRMSG,MYF(0),error,msg,engine);
+	  my_error(ER_GET_ERRMSG,MYF(0),error,str.ptr(),engine);
       }
       else       
 	my_error(ER_GET_ERRNO,errflag,error);
@@ -1146,15 +1147,15 @@ void handler::print_error(int error, myf errflag)
    Return an error message specific to this handler
    
    SYNOPSIS
-   error        [in/out] error code previously returned by handler
-   temporary    [out] temporary error, transaction should be retried if true
+   error        error code previously returned by handler
+   buf          Pointer to String where to add error message
    
-   The returned pointer to error message should not be freed.
+   Returns true if this is a temporary error
  */
 
-const char* handler::get_error_message(int *error, bool *temporary)
+bool handler::get_error_message(int error, String* buf)
 {
-  return NULL;
+  return false;
 }
 
 

sql/handler.h

@@ -288,7 +288,7 @@ class handler :public Sql_alloc
   void update_timestamp(byte *record);
   void update_auto_increment();
   virtual void print_error(int error, myf errflag);
-  virtual const char* get_error_message(int *error, bool *temporary);
+  virtual bool get_error_message(int error, String *buf);
   uint get_dup_key(int error);
   void change_table_ptr(TABLE *table_arg) { table=table_arg; }
   virtual double scan_time()