mariadb/sql/ha_ndbcluster.cc

/* Copyright (C) 2000-2003 MySQL AB

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
*/

/*
  This file defines the NDB Cluster handler: the interface between MySQL and
  NDB Cluster
*/

#ifdef __GNUC__
#pragma implementation                          // gcc: Class implementation
#endif

#include "mysql_priv.h"

#ifdef HAVE_NDBCLUSTER_DB
#include <my_dir.h>
#include "ha_ndbcluster.h"
#include <ndbapi/NdbApi.hpp>
#include <ndbapi/NdbScanFilter.hpp>

// options from from mysqld.cc
extern my_bool opt_ndb_optimized_node_selection;
extern const char *opt_ndbcluster_connectstring;

// Default value for parallelism
static const int parallelism= 240;

// Default value for max number of transactions
// createable against NDB from this handler
static const int max_transactions= 256;

static const char *ha_ndb_ext=".ndb";

#define NDB_HIDDEN_PRIMARY_KEY_LENGTH 8


#define ERR_PRINT(err) \
  DBUG_PRINT("error", ("%d  message: %s", err.code, err.message))

#define ERR_RETURN(err)		         \
{				         \
  ERR_PRINT(err);		         \
  DBUG_RETURN(ndb_to_mysql_error(&err)); \
}

// Typedefs for long names
typedef NdbDictionary::Column NDBCOL;
typedef NdbDictionary::Table NDBTAB;
typedef NdbDictionary::Index  NDBINDEX;
typedef NdbDictionary::Dictionary  NDBDICT;

bool ndbcluster_inited= FALSE;

static Ndb* g_ndb= NULL;
static Ndb_cluster_connection* g_ndb_cluster_connection= NULL;

// Handler synchronization
pthread_mutex_t ndbcluster_mutex;

// Table lock handling
static HASH ndbcluster_open_tables;

static byte *ndbcluster_get_key(NDB_SHARE *share,uint *length,
                                my_bool not_used __attribute__((unused)));
static NDB_SHARE *get_share(const char *table_name);
static void free_share(NDB_SHARE *share);

static int packfrm(const void *data, uint len, const void **pack_data, uint *pack_len);
static int unpackfrm(const void **data, uint *len,
		     const void* pack_data);

static int ndb_get_table_statistics(Ndb*, const char *, 
				    Uint64* rows, Uint64* commits);


/*
  Dummy buffer to read zero pack_length fields
  which are mapped to 1 char
*/
static byte dummy_buf[1];

/*
  Error handling functions
*/

struct err_code_mapping
{
  int ndb_err;
  int my_err;
  int show_warning;
};

static const err_code_mapping err_map[]= 
{
  { 626, HA_ERR_KEY_NOT_FOUND, 0 },
  { 630, HA_ERR_FOUND_DUPP_KEY, 0 },
  { 893, HA_ERR_FOUND_DUPP_KEY, 0 },
  { 721, HA_ERR_TABLE_EXIST, 1 },
  { 4244, HA_ERR_TABLE_EXIST, 1 },

  { 709, HA_ERR_NO_SUCH_TABLE, 1 },
  { 284, HA_ERR_NO_SUCH_TABLE, 1 },

  { 266, HA_ERR_LOCK_WAIT_TIMEOUT, 1 },
  { 274, HA_ERR_LOCK_WAIT_TIMEOUT, 1 },
  { 296, HA_ERR_LOCK_WAIT_TIMEOUT, 1 },
  { 297, HA_ERR_LOCK_WAIT_TIMEOUT, 1 },
  { 237, HA_ERR_LOCK_WAIT_TIMEOUT, 1 },

  { 623, HA_ERR_RECORD_FILE_FULL, 1 },
  { 624, HA_ERR_RECORD_FILE_FULL, 1 },
  { 625, HA_ERR_RECORD_FILE_FULL, 1 },
  { 826, HA_ERR_RECORD_FILE_FULL, 1 },
  { 827, HA_ERR_RECORD_FILE_FULL, 1 },
  { 832, HA_ERR_RECORD_FILE_FULL, 1 },

  { 0, 1, 0 },

  { -1, -1, 1 }
};


static int ndb_to_mysql_error(const NdbError *err)
{
  uint i;
  for (i=0; err_map[i].ndb_err != err->code && err_map[i].my_err != -1; i++);
  if (err_map[i].show_warning)
  {
    // Push the NDB error message as warning
    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
			ER_GET_ERRMSG, ER(ER_GET_ERRMSG),
			err->code, err->message, "NDB");
  }
  if (err_map[i].my_err == -1)
    return err->code;
  return err_map[i].my_err;
}



inline
int execute_no_commit(ha_ndbcluster *h, NdbConnection *trans)
{
  int m_batch_execute= 0;
#ifdef NOT_USED
  if (m_batch_execute)
    return 0;
#endif
  return trans->execute(NoCommit,AbortOnError,h->m_force_send);
}

inline
int execute_commit(ha_ndbcluster *h, NdbConnection *trans)
{
  int m_batch_execute= 0;
#ifdef NOT_USED
  if (m_batch_execute)
    return 0;
#endif
  return trans->execute(Commit,AbortOnError,h->m_force_send);
}

inline
int execute_commit(THD *thd, NdbConnection *trans)
{
  int m_batch_execute= 0;
#ifdef NOT_USED
  if (m_batch_execute)
    return 0;
#endif
  return trans->execute(Commit,AbortOnError,thd->variables.ndb_force_send);
}

inline
int execute_no_commit_ie(ha_ndbcluster *h, NdbConnection *trans)
{
  int m_batch_execute= 0;
#ifdef NOT_USED
  if (m_batch_execute)
    return 0;
#endif
  return trans->execute(NoCommit, AO_IgnoreError,h->m_force_send);
}

/*
  Place holder for ha_ndbcluster thread specific data
*/

Thd_ndb::Thd_ndb()
{
  ndb= new Ndb(g_ndb_cluster_connection, "");
  lock_count= 0;
  count= 0;
  error= 0;
}

Thd_ndb::~Thd_ndb()
{
  if (ndb)
    delete ndb;
  ndb= 0;
}

inline
Ndb *ha_ndbcluster::get_ndb()
{
  return ((Thd_ndb*)current_thd->transaction.thd_ndb)->ndb;
}

/*
 * manage uncommitted insert/deletes during transactio to get records correct
 */

struct Ndb_table_local_info {
  int no_uncommitted_rows_count;
  ulong last_count;
  ha_rows records;
};

void ha_ndbcluster::set_rec_per_key()
{
  DBUG_ENTER("ha_ndbcluster::get_status_const");
  for (uint i=0 ; i < table->keys ; i++)
  {
    table->key_info[i].rec_per_key[table->key_info[i].key_parts-1]= 1;
  }
  DBUG_VOID_RETURN;
}

void ha_ndbcluster::records_update()
{
  if (m_ha_not_exact_count)
    return;
  DBUG_ENTER("ha_ndbcluster::records_update");
  struct Ndb_table_local_info *info= (struct Ndb_table_local_info *)m_table_info;
  DBUG_PRINT("info", ("id=%d, no_uncommitted_rows_count=%d",
		      ((const NDBTAB *)m_table)->getTableId(),
		      info->no_uncommitted_rows_count));
  //  if (info->records == ~(ha_rows)0)
  {
    Ndb *ndb= get_ndb();
    Uint64 rows;
    if(ndb_get_table_statistics(ndb, m_tabname, &rows, 0) == 0){
      info->records= rows;
    }
  }
  {
    THD *thd= current_thd;
    if (((Thd_ndb*)(thd->transaction.thd_ndb))->error)
      info->no_uncommitted_rows_count= 0;
  }
  records= info->records+ info->no_uncommitted_rows_count;
  DBUG_VOID_RETURN;
}

void ha_ndbcluster::no_uncommitted_rows_execute_failure()
{
  if (m_ha_not_exact_count)
    return;
  DBUG_ENTER("ha_ndbcluster::no_uncommitted_rows_execute_failure");
  THD *thd= current_thd;
  ((Thd_ndb*)(thd->transaction.thd_ndb))->error= 1;
  DBUG_VOID_RETURN;
}

void ha_ndbcluster::no_uncommitted_rows_init(THD *thd)
{
  if (m_ha_not_exact_count)
    return;
  DBUG_ENTER("ha_ndbcluster::no_uncommitted_rows_init");
  struct Ndb_table_local_info *info= (struct Ndb_table_local_info *)m_table_info;
  Thd_ndb *thd_ndb= (Thd_ndb *)thd->transaction.thd_ndb;
  if (info->last_count != thd_ndb->count)
  {
    info->last_count = thd_ndb->count;
    info->no_uncommitted_rows_count= 0;
    info->records= ~(ha_rows)0;
    DBUG_PRINT("info", ("id=%d, no_uncommitted_rows_count=%d",
			((const NDBTAB *)m_table)->getTableId(),
			info->no_uncommitted_rows_count));
  }
  DBUG_VOID_RETURN;
}

void ha_ndbcluster::no_uncommitted_rows_update(int c)
{
  if (m_ha_not_exact_count)
    return;
  DBUG_ENTER("ha_ndbcluster::no_uncommitted_rows_update");
  struct Ndb_table_local_info *info=
    (struct Ndb_table_local_info *)m_table_info;
  info->no_uncommitted_rows_count+= c;
  DBUG_PRINT("info", ("id=%d, no_uncommitted_rows_count=%d",
		      ((const NDBTAB *)m_table)->getTableId(),
		      info->no_uncommitted_rows_count));
  DBUG_VOID_RETURN;
}

void ha_ndbcluster::no_uncommitted_rows_reset(THD *thd)
{
  if (m_ha_not_exact_count)
    return;
  DBUG_ENTER("ha_ndbcluster::no_uncommitted_rows_reset");
  ((Thd_ndb*)(thd->transaction.thd_ndb))->count++;
  ((Thd_ndb*)(thd->transaction.thd_ndb))->error= 0;
  DBUG_VOID_RETURN;
}

/*
  Take care of the error that occured in NDB
  
  RETURN
    0	No error
    #   The mapped error code
*/


int ha_ndbcluster::ndb_err(NdbConnection *trans)
{
  int res;
  const NdbError err= trans->getNdbError();
  DBUG_ENTER("ndb_err");
  
  ERR_PRINT(err);
  switch (err.classification) {
  case NdbError::SchemaError:
  {
    Ndb *ndb= get_ndb();
    NDBDICT *dict= ndb->getDictionary();
    DBUG_PRINT("info", ("invalidateTable %s", m_tabname));
    dict->invalidateTable(m_tabname);
    table->version=0L;			/* Free when thread is ready */
    break;
  }
  default:
    break;
  }
  res= ndb_to_mysql_error(&err);
  DBUG_PRINT("info", ("transformed ndbcluster error %d to mysql error %d", 
		      err.code, res));
  if (res == HA_ERR_FOUND_DUPP_KEY)
    m_dupkey= table->primary_key;
  
  DBUG_RETURN(res);
}


/*
  Override the default get_error_message in order to add the 
  error message of NDB 
 */

bool ha_ndbcluster::get_error_message(int error, 
				      String *buf)
{
  DBUG_ENTER("ha_ndbcluster::get_error_message");
  DBUG_PRINT("enter", ("error: %d", error));

  Ndb *ndb= get_ndb();
  if (!ndb)
    DBUG_RETURN(FALSE);

  const NdbError err= ndb->getNdbError(error);
  bool temporary= err.status==NdbError::TemporaryError;
  buf->set(err.message, strlen(err.message), &my_charset_bin);
  DBUG_PRINT("exit", ("message: %s, temporary: %d", buf->ptr(), temporary));
  DBUG_RETURN(temporary);
}


/*
  Check if type is supported by NDB.
  TODO Use this once in open(), not in every operation

*/

static inline bool ndb_supported_type(enum_field_types type)
{
  switch (type) {
  case MYSQL_TYPE_DECIMAL:    
  case MYSQL_TYPE_TINY:        
  case MYSQL_TYPE_SHORT:
  case MYSQL_TYPE_LONG:
  case MYSQL_TYPE_INT24:       
  case MYSQL_TYPE_LONGLONG:
  case MYSQL_TYPE_FLOAT:
  case MYSQL_TYPE_DOUBLE:
  case MYSQL_TYPE_TIMESTAMP:
  case MYSQL_TYPE_DATETIME:    
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_NEWDATE:
  case MYSQL_TYPE_TIME:        
  case MYSQL_TYPE_YEAR:        
  case MYSQL_TYPE_STRING:      
  case MYSQL_TYPE_VAR_STRING:
  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_BLOB:    
  case MYSQL_TYPE_MEDIUM_BLOB:   
  case MYSQL_TYPE_LONG_BLOB:  
  case MYSQL_TYPE_ENUM:
  case MYSQL_TYPE_SET:         
    return TRUE;
  case MYSQL_TYPE_NULL:   
  case MYSQL_TYPE_GEOMETRY:
    break;
  }
  return FALSE;
}


/*
  Instruct NDB to set the value of the hidden primary key
*/

bool ha_ndbcluster::set_hidden_key(NdbOperation *ndb_op,
				   uint fieldnr, const byte *field_ptr)
{
  DBUG_ENTER("set_hidden_key");
  DBUG_RETURN(ndb_op->equal(fieldnr, (char*)field_ptr,
			    NDB_HIDDEN_PRIMARY_KEY_LENGTH) != 0);
}


/*
  Instruct NDB to set the value of one primary key attribute
*/

int ha_ndbcluster::set_ndb_key(NdbOperation *ndb_op, Field *field,
                               uint fieldnr, const byte *field_ptr)
{
  uint32 pack_len= field->pack_length();
  DBUG_ENTER("set_ndb_key");
  DBUG_PRINT("enter", ("%d: %s, ndb_type: %u, len=%d", 
                       fieldnr, field->field_name, field->type(),
                       pack_len));
  DBUG_DUMP("key", (char*)field_ptr, pack_len);
  
  if (ndb_supported_type(field->type()))
  {
    if (! (field->flags & BLOB_FLAG))
      // Common implementation for most field types
      DBUG_RETURN(ndb_op->equal(fieldnr, (char*) field_ptr, pack_len) != 0);
  }
  // Unhandled field types
  DBUG_PRINT("error", ("Field type %d not supported", field->type()));
  DBUG_RETURN(2);
}


/*
 Instruct NDB to set the value of one attribute
*/

int ha_ndbcluster::set_ndb_value(NdbOperation *ndb_op, Field *field, 
                                 uint fieldnr, bool *set_blob_value)
{
  const byte* field_ptr= field->ptr;
  uint32 pack_len=  field->pack_length();
  DBUG_ENTER("set_ndb_value");
  DBUG_PRINT("enter", ("%d: %s, type: %u, len=%d, is_null=%s", 
                       fieldnr, field->field_name, field->type(), 
                       pack_len, field->is_null()?"Y":"N"));
  DBUG_DUMP("value", (char*) field_ptr, pack_len);

  if (ndb_supported_type(field->type()))
  {
    // ndb currently does not support size 0
    const byte *empty_field= "";
    if (pack_len == 0)
    {
      pack_len= 1;
      field_ptr= empty_field;
    }
    if (! (field->flags & BLOB_FLAG))
    {
      if (field->is_null())
        // Set value to NULL
        DBUG_RETURN((ndb_op->setValue(fieldnr, (char*)NULL, pack_len) != 0));
      // Common implementation for most field types
      DBUG_RETURN(ndb_op->setValue(fieldnr, (char*)field_ptr, pack_len) != 0);
    }

    // Blob type
    NdbBlob *ndb_blob= ndb_op->getBlobHandle(fieldnr);
    if (ndb_blob != NULL)
    {
      if (field->is_null())
        DBUG_RETURN(ndb_blob->setNull() != 0);

      Field_blob *field_blob= (Field_blob*)field;

      // Get length and pointer to data
      uint32 blob_len= field_blob->get_length(field_ptr);
      char* blob_ptr= NULL;
      field_blob->get_ptr(&blob_ptr);

      // Looks like NULL ptr signals length 0 blob
      if (blob_ptr == NULL) {
        DBUG_ASSERT(blob_len == 0);
        blob_ptr= (char*)"";
      }

      DBUG_PRINT("value", ("set blob ptr=%x len=%u",
                           (unsigned)blob_ptr, blob_len));
      DBUG_DUMP("value", (char*)blob_ptr, min(blob_len, 26));

      if (set_blob_value)
	*set_blob_value= TRUE;
      // No callback needed to write value
      DBUG_RETURN(ndb_blob->setValue(blob_ptr, blob_len) != 0);
    }
    DBUG_RETURN(1);
  }
  // Unhandled field types
  DBUG_PRINT("error", ("Field type %d not supported", field->type()));
  DBUG_RETURN(2);
}


/*
  Callback to read all blob values.
  - not done in unpack_record because unpack_record is valid
    after execute(Commit) but reading blobs is not
  - may only generate read operations; they have to be executed
    somewhere before the data is available
  - due to single buffer for all blobs, we let the last blob
    process all blobs (last so that all are active)
  - null bit is still set in unpack_record
  - TODO allocate blob part aligned buffers
*/

NdbBlob::ActiveHook g_get_ndb_blobs_value;

int g_get_ndb_blobs_value(NdbBlob *ndb_blob, void *arg)
{
  DBUG_ENTER("g_get_ndb_blobs_value");
  if (ndb_blob->blobsNextBlob() != NULL)
    DBUG_RETURN(0);
  ha_ndbcluster *ha= (ha_ndbcluster *)arg;
  DBUG_RETURN(ha->get_ndb_blobs_value(ndb_blob));
}

int ha_ndbcluster::get_ndb_blobs_value(NdbBlob *last_ndb_blob)
{
  DBUG_ENTER("get_ndb_blobs_value");

  // Field has no field number so cannot use TABLE blob_field
  // Loop twice, first only counting total buffer size
  for (int loop= 0; loop <= 1; loop++)
  {
    uint32 offset= 0;
    for (uint i= 0; i < table->fields; i++)
    {
      Field *field= table->field[i];
      NdbValue value= m_value[i];
      if (value.ptr != NULL && (field->flags & BLOB_FLAG))
      {
        Field_blob *field_blob= (Field_blob *)field;
        NdbBlob *ndb_blob= value.blob;
        Uint64 blob_len= 0;
        if (ndb_blob->getLength(blob_len) != 0)
          DBUG_RETURN(-1);
        // Align to Uint64
        uint32 blob_size= blob_len;
        if (blob_size % 8 != 0)
          blob_size+= 8 - blob_size % 8;
        if (loop == 1)
        {
          char *buf= m_blobs_buffer + offset;
          uint32 len= 0xffffffff;  // Max uint32
          DBUG_PRINT("value", ("read blob ptr=%x len=%u",
                               (uint)buf, (uint)blob_len));
          if (ndb_blob->readData(buf, len) != 0)
            DBUG_RETURN(-1);
          DBUG_ASSERT(len == blob_len);
          field_blob->set_ptr(len, buf);
        }
        offset+= blob_size;
      }
    }
    if (loop == 0 && offset > m_blobs_buffer_size)
    {
      my_free(m_blobs_buffer, MYF(MY_ALLOW_ZERO_PTR));
      m_blobs_buffer_size= 0;
      DBUG_PRINT("value", ("allocate blobs buffer size %u", offset));
      m_blobs_buffer= my_malloc(offset, MYF(MY_WME));
      if (m_blobs_buffer == NULL)
        DBUG_RETURN(-1);
      m_blobs_buffer_size= offset;
    }
  }
  DBUG_RETURN(0);
}


/*
  Instruct NDB to fetch one field
  - data is read directly into buffer provided by field
    if field is NULL, data is read into memory provided by NDBAPI
*/

int ha_ndbcluster::get_ndb_value(NdbOperation *ndb_op, Field *field,
                                 uint fieldnr, byte* buf)
{
  DBUG_ENTER("get_ndb_value");
  DBUG_PRINT("enter", ("fieldnr: %d flags: %o", fieldnr,
                       (int)(field != NULL ? field->flags : 0)));

  if (field != NULL)
  {
    DBUG_ASSERT(buf);
    if (ndb_supported_type(field->type()))
    {
      DBUG_ASSERT(field->ptr != NULL);
      if (! (field->flags & BLOB_FLAG))
      {	
	byte *field_buf;
	if (field->pack_length() != 0)
	  field_buf= buf + (field->ptr - table->record[0]);
	else
	  field_buf= dummy_buf;
        m_value[fieldnr].rec= ndb_op->getValue(fieldnr, 
					       field_buf);
        DBUG_RETURN(m_value[fieldnr].rec == NULL);
      }

      // Blob type
      NdbBlob *ndb_blob= ndb_op->getBlobHandle(fieldnr);
      m_value[fieldnr].blob= ndb_blob;
      if (ndb_blob != NULL)
      {
        // Set callback
        void *arg= (void *)this;
        DBUG_RETURN(ndb_blob->setActiveHook(g_get_ndb_blobs_value, arg) != 0);
      }
      DBUG_RETURN(1);
    }
    // Unhandled field types
    DBUG_PRINT("error", ("Field type %d not supported", field->type()));
    DBUG_RETURN(2);
  }

  // Used for hidden key only
  m_value[fieldnr].rec= ndb_op->getValue(fieldnr, NULL);
  DBUG_RETURN(m_value[fieldnr].rec == NULL);
}


/*
  Check if any set or get of blob value in current query.
*/
bool ha_ndbcluster::uses_blob_value(bool all_fields)
{
  if (table->blob_fields == 0)
    return FALSE;
  if (all_fields)
    return TRUE;
  {
    uint no_fields= table->fields;
    int i;
    THD *thd= table->in_use;
    // They always put blobs at the end..
    for (i= no_fields - 1; i >= 0; i--)
    {
      Field *field= table->field[i];
      if (thd->query_id == field->query_id)
      {
        return TRUE;
      }
    }
  }
  return FALSE;
}


/*
  Get metadata for this table from NDB 

  IMPLEMENTATION
    - save the NdbDictionary::Table for easy access
    - check that frm-file on disk is equal to frm-file
      of table accessed in NDB
    - build a list of the indexes for the table
*/

int ha_ndbcluster::get_metadata(const char *path)
{
  Ndb *ndb= get_ndb();
  NDBDICT *dict= ndb->getDictionary();
  const NDBTAB *tab;
  int error;
  bool invalidating_ndb_table= FALSE;

  DBUG_ENTER("get_metadata");
  DBUG_PRINT("enter", ("m_tabname: %s, path: %s", m_tabname, path));

  do {
    const void *data, *pack_data;
    uint length, pack_length;

    if (!(tab= dict->getTable(m_tabname)))
      ERR_RETURN(dict->getNdbError());
    DBUG_PRINT("info", ("Table schema version: %d", tab->getObjectVersion()));
    /*
      Compare FrmData in NDB with frm file from disk.
    */
    error= 0;
    if (readfrm(path, &data, &length) ||
	packfrm(data, length, &pack_data, &pack_length))
    {
      my_free((char*)data, MYF(MY_ALLOW_ZERO_PTR));
      my_free((char*)pack_data, MYF(MY_ALLOW_ZERO_PTR));
      DBUG_RETURN(1);
    }
    
    if ((pack_length != tab->getFrmLength()) || 
	(memcmp(pack_data, tab->getFrmData(), pack_length)))
    {
      if (!invalidating_ndb_table)
      {
	DBUG_PRINT("info", ("Invalidating table"));
	dict->invalidateTable(m_tabname);
	invalidating_ndb_table= TRUE;
      }
      else
      {
	DBUG_PRINT("error", 
		   ("metadata, pack_length: %d getFrmLength: %d memcmp: %d", 
		    pack_length, tab->getFrmLength(),
		    memcmp(pack_data, tab->getFrmData(), pack_length)));      
	DBUG_DUMP("pack_data", (char*)pack_data, pack_length);
	DBUG_DUMP("frm", (char*)tab->getFrmData(), tab->getFrmLength());
	error= 3;
	invalidating_ndb_table= FALSE;
      }
    }
    else
    {
      invalidating_ndb_table= FALSE;
    }
    my_free((char*)data, MYF(0));
    my_free((char*)pack_data, MYF(0));
  } while (invalidating_ndb_table);

  if (error)
    DBUG_RETURN(error);

  m_table= NULL;
  m_table_info= NULL;
  
  DBUG_RETURN(build_index_list(table, ILBP_OPEN));  
}


int ha_ndbcluster::build_index_list(TABLE *tab, enum ILBP phase)
{
  uint i;
  int error= 0;
  const char *name, *index_name;
  char unique_index_name[FN_LEN];
  static const char* unique_suffix= "$unique";
  KEY* key_info= tab->key_info;
  const char **key_name= tab->keynames.type_names;
  Ndb *ndb= get_ndb();
  NdbDictionary::Dictionary *dict= ndb->getDictionary();
  DBUG_ENTER("build_index_list");
  
  // Save information about all known indexes
  for (i= 0; i < tab->keys; i++, key_info++, key_name++)
  {
    index_name= *key_name;
    NDB_INDEX_TYPE idx_type= get_index_type_from_table(i);
    m_index[i].type= idx_type;
    if (idx_type == UNIQUE_ORDERED_INDEX || idx_type == UNIQUE_INDEX)
    {
      strxnmov(unique_index_name, FN_LEN, index_name, unique_suffix, NullS);
      DBUG_PRINT("info", ("Created unique index name \'%s\' for index %d",
			  unique_index_name, i));
    }
    // Create secondary indexes if in create phase
    if (phase == ILBP_CREATE)
    {
      DBUG_PRINT("info", ("Creating index %u: %s", i, index_name));      
      switch (idx_type){
	
      case PRIMARY_KEY_INDEX:
	// Do nothing, already created
	break;
      case PRIMARY_KEY_ORDERED_INDEX:
	error= create_ordered_index(index_name, key_info);
	break;
      case UNIQUE_ORDERED_INDEX:
	if (!(error= create_ordered_index(index_name, key_info)))
	  error= create_unique_index(unique_index_name, key_info);
	break;
      case UNIQUE_INDEX:
	if (!(error= check_index_fields_not_null(i)))
	  error= create_unique_index(unique_index_name, key_info);
	break;
      case ORDERED_INDEX:
	error= create_ordered_index(index_name, key_info);
	break;
      default:
	DBUG_ASSERT(FALSE);
	break;
      }
      if (error)
      {
	DBUG_PRINT("error", ("Failed to create index %u", i));
	drop_table();
	break;
      }
    }
    // Add handles to index objects
    if (idx_type != PRIMARY_KEY_INDEX && idx_type != UNIQUE_INDEX)
    {
      DBUG_PRINT("info", ("Get handle to index %s", index_name));
      const NDBINDEX *index= dict->getIndex(index_name, m_tabname);
      if (!index) DBUG_RETURN(1);
      m_index[i].index= (void *) index;
    }
    if (idx_type == UNIQUE_ORDERED_INDEX || idx_type == UNIQUE_INDEX)
    {
      DBUG_PRINT("info", ("Get handle to unique_index %s", unique_index_name));
      const NDBINDEX *index= dict->getIndex(unique_index_name, m_tabname);
      if (!index) DBUG_RETURN(1);
      m_index[i].unique_index= (void *) index;
    }      
  }
  
  DBUG_RETURN(error);
}


/*
  Decode the type of an index from information 
  provided in table object
*/
NDB_INDEX_TYPE ha_ndbcluster::get_index_type_from_table(uint inx) const
{
  bool is_hash_index=  (table->key_info[inx].algorithm == HA_KEY_ALG_HASH);
  if (inx == table->primary_key)
    return is_hash_index ? PRIMARY_KEY_INDEX : PRIMARY_KEY_ORDERED_INDEX;
  else
    return ((table->key_info[inx].flags & HA_NOSAME) ? 
	    (is_hash_index ? UNIQUE_INDEX : UNIQUE_ORDERED_INDEX) :
	    ORDERED_INDEX);
} 

int ha_ndbcluster::check_index_fields_not_null(uint inx)
{
  KEY* key_info= table->key_info + inx;
  KEY_PART_INFO* key_part= key_info->key_part;
  KEY_PART_INFO* end= key_part+key_info->key_parts;
  DBUG_ENTER("check_index_fields_not_null");
  
  for (; key_part != end; key_part++) 
    {
      Field* field= key_part->field;
      if (field->maybe_null())
      {
	my_printf_error(ER_NULL_COLUMN_IN_INDEX,ER(ER_NULL_COLUMN_IN_INDEX),
			MYF(0),field->field_name);
	DBUG_RETURN(ER_NULL_COLUMN_IN_INDEX);
      }
    }
  
  DBUG_RETURN(0);
}

void ha_ndbcluster::release_metadata()
{
  uint i;

  DBUG_ENTER("release_metadata");
  DBUG_PRINT("enter", ("m_tabname: %s", m_tabname));

  m_table= NULL;
  m_table_info= NULL;

  // Release index list 
  for (i= 0; i < MAX_KEY; i++)
  {
    m_index[i].unique_index= NULL;      
    m_index[i].index= NULL;      
  }

  DBUG_VOID_RETURN;
}

int ha_ndbcluster::get_ndb_lock_type(enum thr_lock_type type)
{
  if (type >= TL_WRITE_ALLOW_WRITE)
    return NdbOperation::LM_Exclusive;
  else if (uses_blob_value(m_retrieve_all_fields))
    return NdbOperation::LM_Read;
  else
    return NdbOperation::LM_CommittedRead;
}

static const ulong index_type_flags[]=
{
  /* UNDEFINED_INDEX */
  0,                         

  /* PRIMARY_KEY_INDEX */
  HA_ONLY_WHOLE_INDEX, 

  /* PRIMARY_KEY_ORDERED_INDEX */
  /* 
     Enable HA_KEYREAD_ONLY when "sorted" indexes are supported, 
     thus ORDERD BY clauses can be optimized by reading directly 
     through the index.
  */
  // HA_KEYREAD_ONLY | 
  HA_READ_NEXT |
  HA_READ_RANGE |
  HA_READ_ORDER,

  /* UNIQUE_INDEX */
  HA_ONLY_WHOLE_INDEX,

  /* UNIQUE_ORDERED_INDEX */
  HA_READ_NEXT |
  HA_READ_RANGE |
  HA_READ_ORDER,

  /* ORDERED_INDEX */
  HA_READ_NEXT |
  HA_READ_RANGE |
  HA_READ_ORDER
};

static const int index_flags_size= sizeof(index_type_flags)/sizeof(ulong);

inline NDB_INDEX_TYPE ha_ndbcluster::get_index_type(uint idx_no) const
{
  DBUG_ASSERT(idx_no < MAX_KEY);
  return m_index[idx_no].type;
}


/*
  Get the flags for an index

  RETURN
    flags depending on the type of the index.
*/

inline ulong ha_ndbcluster::index_flags(uint idx_no, uint part,
                                        bool all_parts) const 
{ 
  DBUG_ENTER("index_flags");
  DBUG_PRINT("info", ("idx_no: %d", idx_no));
  DBUG_ASSERT(get_index_type_from_table(idx_no) < index_flags_size);
  DBUG_RETURN(index_type_flags[get_index_type_from_table(idx_no)]);
}


int ha_ndbcluster::set_primary_key(NdbOperation *op, const byte *key)
{
  KEY* key_info= table->key_info + table->primary_key;
  KEY_PART_INFO* key_part= key_info->key_part;
  KEY_PART_INFO* end= key_part+key_info->key_parts;
  DBUG_ENTER("set_primary_key");

  for (; key_part != end; key_part++) 
  {
    Field* field= key_part->field;
    if (set_ndb_key(op, field, 
		    key_part->fieldnr-1, key))
      ERR_RETURN(op->getNdbError());
    key += key_part->length;
  }
  DBUG_RETURN(0);
}


int ha_ndbcluster::set_primary_key_from_old_data(NdbOperation *op, const byte *old_data)
{
  KEY* key_info= table->key_info + table->primary_key;
  KEY_PART_INFO* key_part= key_info->key_part;
  KEY_PART_INFO* end= key_part+key_info->key_parts;
  DBUG_ENTER("set_primary_key_from_old_data");

  for (; key_part != end; key_part++) 
  {
    Field* field= key_part->field;
    if (set_ndb_key(op, field, 
		    key_part->fieldnr-1, old_data+key_part->offset))
      ERR_RETURN(op->getNdbError());
  }
  DBUG_RETURN(0);
}


int ha_ndbcluster::set_primary_key(NdbOperation *op)
{
  DBUG_ENTER("set_primary_key");
  KEY* key_info= table->key_info + table->primary_key;
  KEY_PART_INFO* key_part= key_info->key_part;
  KEY_PART_INFO* end= key_part+key_info->key_parts;

  for (; key_part != end; key_part++) 
  {
    Field* field= key_part->field;
    if (set_ndb_key(op, field, 
                    key_part->fieldnr-1, field->ptr))
      ERR_RETURN(op->getNdbError());
  }
  DBUG_RETURN(0);
}


/*
  Read one record from NDB using primary key
*/

int ha_ndbcluster::pk_read(const byte *key, uint key_len, byte *buf) 
{
  uint no_fields= table->fields, i;
  NdbConnection *trans= m_active_trans;
  NdbOperation *op;
  THD *thd= current_thd;
  DBUG_ENTER("pk_read");
  DBUG_PRINT("enter", ("key_len: %u", key_len));
  DBUG_DUMP("key", (char*)key, key_len);

  NdbOperation::LockMode lm=
    (NdbOperation::LockMode)get_ndb_lock_type(m_lock.type);
  if (!(op= trans->getNdbOperation((const NDBTAB *) m_table)) || 
      op->readTuple(lm) != 0)
    ERR_RETURN(trans->getNdbError());

  if (table->primary_key == MAX_KEY) 
  {
    // This table has no primary key, use "hidden" primary key
    DBUG_PRINT("info", ("Using hidden key"));
    DBUG_DUMP("key", (char*)key, 8);    
    if (set_hidden_key(op, no_fields, key))
      ERR_RETURN(trans->getNdbError());

    // Read key at the same time, for future reference
    if (get_ndb_value(op, NULL, no_fields, NULL))
      ERR_RETURN(trans->getNdbError());
  } 
  else 
  {
    int res;
    if ((res= set_primary_key(op, key)))
      return res;
  }
  
  // Read all wanted non-key field(s) unless HA_EXTRA_RETRIEVE_ALL_COLS
  for (i= 0; i < no_fields; i++) 
  {
    Field *field= table->field[i];
    if ((thd->query_id == field->query_id) ||
	m_retrieve_all_fields ||
	(field->flags & PRI_KEY_FLAG) && m_retrieve_primary_key)
    {
      if (get_ndb_value(op, field, i, buf))
	ERR_RETURN(trans->getNdbError());
    }
    else
    {
      // Attribute was not to be read
      m_value[i].ptr= NULL;
    }
  }
  
  if (execute_no_commit_ie(this,trans) != 0) 
  {
    table->status= STATUS_NOT_FOUND;
    DBUG_RETURN(ndb_err(trans));
  }

  // The value have now been fetched from NDB  
  unpack_record(buf);
  table->status= 0;     
  DBUG_RETURN(0);
}


/*
  Read one complementing record from NDB using primary key from old_data
*/

int ha_ndbcluster::complemented_pk_read(const byte *old_data, byte *new_data)
{
  uint no_fields= table->fields, i;
  NdbConnection *trans= m_active_trans;
  NdbOperation *op;
  THD *thd= current_thd;
  DBUG_ENTER("complemented_pk_read");

  if (m_retrieve_all_fields)
    // We have allready retrieved all fields, nothing to complement
    DBUG_RETURN(0);

  NdbOperation::LockMode lm=
    (NdbOperation::LockMode)get_ndb_lock_type(m_lock.type);
  if (!(op= trans->getNdbOperation((const NDBTAB *) m_table)) || 
      op->readTuple(lm) != 0)
    ERR_RETURN(trans->getNdbError());

    int res;
    if ((res= set_primary_key_from_old_data(op, old_data)))
      ERR_RETURN(trans->getNdbError());
    
  // Read all unreferenced non-key field(s)
  for (i= 0; i < no_fields; i++) 
  {
    Field *field= table->field[i];
    if (!(field->flags & PRI_KEY_FLAG) &&
	(thd->query_id != field->query_id))
    {
      if (get_ndb_value(op, field, i, new_data))
	ERR_RETURN(trans->getNdbError());
    }
  }
  
  if (execute_no_commit(this,trans) != 0) 
  {
    table->status= STATUS_NOT_FOUND;
    DBUG_RETURN(ndb_err(trans));
  }

  // The value have now been fetched from NDB  
  unpack_record(new_data);
  table->status= 0;     
  DBUG_RETURN(0);
}

/*
  Peek to check if a particular row already exists
*/

int ha_ndbcluster::peek_row()
{
  NdbConnection *trans= m_active_trans;
  NdbOperation *op;
  THD *thd= current_thd;
  DBUG_ENTER("peek_row");
                                                                                
  NdbOperation::LockMode lm=
    (NdbOperation::LockMode)get_ndb_lock_type(m_lock.type);
  if (!(op= trans->getNdbOperation((const NDBTAB *) m_table)) ||
      op->readTuple(lm) != 0)
    ERR_RETURN(trans->getNdbError());
                                                                                
  int res;
  if ((res= set_primary_key(op)))
    ERR_RETURN(trans->getNdbError());
                                                                                
  if (execute_no_commit_ie(this,trans) != 0)
    {
      table->status= STATUS_NOT_FOUND;
      DBUG_RETURN(ndb_err(trans));
    }                                                                                
  DBUG_RETURN(0);
}

/*
  Read one record from NDB using unique secondary index
*/

int ha_ndbcluster::unique_index_read(const byte *key,
				     uint key_len, byte *buf)
{
  NdbConnection *trans= m_active_trans;
  NdbIndexOperation *op;
  THD *thd= current_thd;
  byte *key_ptr;
  KEY* key_info;
  KEY_PART_INFO *key_part, *end;
  uint i;
  DBUG_ENTER("unique_index_read");
  DBUG_PRINT("enter", ("key_len: %u, index: %u", key_len, active_index));
  DBUG_DUMP("key", (char*)key, key_len);
  
  NdbOperation::LockMode lm=
    (NdbOperation::LockMode)get_ndb_lock_type(m_lock.type);
  if (!(op= trans->getNdbIndexOperation((NDBINDEX *) 
					m_index[active_index].unique_index, 
                                        (const NDBTAB *) m_table)) ||
      op->readTuple(lm) != 0)
    ERR_RETURN(trans->getNdbError());
  
  // Set secondary index key(s)
  key_ptr= (byte *) key;
  key_info= table->key_info + active_index;
  DBUG_ASSERT(key_info->key_length == key_len);
  end= (key_part= key_info->key_part) + key_info->key_parts;

  for (i= 0; key_part != end; key_part++, i++) 
  {
    if (set_ndb_key(op, key_part->field, i, 
		    key_part->null_bit ? key_ptr + 1 : key_ptr))
      ERR_RETURN(trans->getNdbError());
    key_ptr+= key_part->store_length;
  }

  // Get non-index attribute(s)
  for (i= 0; i < table->fields; i++) 
  {
    Field *field= table->field[i];
    if ((thd->query_id == field->query_id) ||
        (field->flags & PRI_KEY_FLAG)) // && m_retrieve_primary_key ??
    {
      if (get_ndb_value(op, field, i, buf))
        ERR_RETURN(op->getNdbError());
    }
    else
    {
      // Attribute was not to be read
      m_value[i].ptr= NULL;
    }
  }

  if (execute_no_commit_ie(this,trans) != 0) 
  {
    table->status= STATUS_NOT_FOUND;
    DBUG_RETURN(ndb_err(trans));
  }
  // The value have now been fetched from NDB
  unpack_record(buf);
  table->status= 0;
  DBUG_RETURN(0);
}

/*
  Get the next record of a started scan. Try to fetch
  it locally from NdbApi cached records if possible, 
  otherwise ask NDB for more.

  NOTE
  If this is a update/delete make sure to not contact 
  NDB before any pending ops have been sent to NDB.

*/

inline int ha_ndbcluster::next_result(byte *buf)
{  
  int check;
  NdbConnection *trans= m_active_trans;
  NdbResultSet *cursor= m_active_cursor; 
  DBUG_ENTER("next_result");

  if (!cursor)
    DBUG_RETURN(HA_ERR_END_OF_FILE);
    
  /* 
     If this an update or delete, call nextResult with false
     to process any records already cached in NdbApi
  */
  bool contact_ndb= m_lock.type < TL_WRITE_ALLOW_WRITE;
  do {
    DBUG_PRINT("info", ("Call nextResult, contact_ndb: %d", contact_ndb));
    /*
      We can only handle one tuple with blobs at a time.
    */
    if (m_ops_pending && m_blobs_pending)
    {
      if (execute_no_commit(this,trans) != 0)
	DBUG_RETURN(ndb_err(trans));
      m_ops_pending= 0;
      m_blobs_pending= FALSE;
    }
    check= cursor->nextResult(contact_ndb, m_force_send);
    if (check == 0)
    {
      // One more record found
      DBUG_PRINT("info", ("One more record found"));    

      unpack_record(buf);
      table->status= 0;
      DBUG_RETURN(0);
    } 
    else if (check == 1 || check == 2)
    {
      // 1: No more records
      // 2: No more cached records

      /*
	Before fetching more rows and releasing lock(s),
	all pending update or delete operations should 
	be sent to NDB
      */
      DBUG_PRINT("info", ("ops_pending: %d", m_ops_pending));    
      if (m_ops_pending)
      {
	//	if (current_thd->transaction.on)
	if (m_transaction_on)
	{
	  if (execute_no_commit(this,trans) != 0)
	    DBUG_RETURN(ndb_err(trans));
	}
	else
	{
	  if  (execute_commit(this,trans) != 0)
	    DBUG_RETURN(ndb_err(trans));
	  int res= trans->restart();
	  DBUG_ASSERT(res == 0);
	}
	m_ops_pending= 0;
      }
      
      contact_ndb= (check == 2);
    }
  } while (check == 2);
    
  table->status= STATUS_NOT_FOUND;
  if (check == -1)
    DBUG_RETURN(ndb_err(trans));

  // No more records
  DBUG_PRINT("info", ("No more records"));
  DBUG_RETURN(HA_ERR_END_OF_FILE);
}

/*
  Set bounds for ordered index scan.
*/

int ha_ndbcluster::set_bounds(NdbIndexScanOperation *op,
			      const key_range *keys[2])
{
  const KEY *const key_info= table->key_info + active_index;
  const uint key_parts= key_info->key_parts;
  uint key_tot_len[2];
  uint tot_len;
  uint i, j;

  DBUG_ENTER("set_bounds");
  DBUG_PRINT("info", ("key_parts=%d", key_parts));

  for (j= 0; j <= 1; j++)
  {
    const key_range *key= keys[j];
    if (key != NULL)
    {
      // for key->flag see ha_rkey_function
      DBUG_PRINT("info", ("key %d length=%d flag=%d",
                          j, key->length, key->flag));
      key_tot_len[j]= key->length;
    }
    else
    {
      DBUG_PRINT("info", ("key %d not present", j));
      key_tot_len[j]= 0;
    }
  }
  tot_len= 0;

  for (i= 0; i < key_parts; i++)
  {
    KEY_PART_INFO *key_part= &key_info->key_part[i];
    Field *field= key_part->field;
    uint part_len= key_part->length;
    uint part_store_len= key_part->store_length;
    // Info about each key part
    struct part_st {
      bool part_last;
      const key_range *key;
      const byte *part_ptr;
      bool part_null;
      int bound_type;
      const char* bound_ptr;
    };
    struct part_st part[2];

    for (j= 0; j <= 1; j++)
    {
      struct part_st &p = part[j];
      p.key= NULL;
      p.bound_type= -1;
      if (tot_len < key_tot_len[j])
      {
        p.part_last= (tot_len + part_store_len >= key_tot_len[j]);
        p.key= keys[j];
        p.part_ptr= &p.key->key[tot_len];
        p.part_null= key_part->null_bit && *p.part_ptr;
        p.bound_ptr= (const char *)
          p.part_null ? 0 : key_part->null_bit ? p.part_ptr + 1 : p.part_ptr;

        if (j == 0)
        {
          switch (p.key->flag)
          {
            case HA_READ_KEY_EXACT:
              p.bound_type= NdbIndexScanOperation::BoundEQ;
              break;
            case HA_READ_KEY_OR_NEXT:
              p.bound_type= NdbIndexScanOperation::BoundLE;
              break;
            case HA_READ_AFTER_KEY:
              if (! p.part_last)
                p.bound_type= NdbIndexScanOperation::BoundLE;
              else
                p.bound_type= NdbIndexScanOperation::BoundLT;
              break;
            default:
              break;
          }
        }
        if (j == 1) {
          switch (p.key->flag)
          {
            case HA_READ_BEFORE_KEY:
              if (! p.part_last)
                p.bound_type= NdbIndexScanOperation::BoundGE;
              else
                p.bound_type= NdbIndexScanOperation::BoundGT;
              break;
            case HA_READ_AFTER_KEY:     // weird
              p.bound_type= NdbIndexScanOperation::BoundGE;
              break;
            default:
              break;
          }
        }

        if (p.bound_type == -1)
        {
          DBUG_PRINT("error", ("key %d unknown flag %d", j, p.key->flag));
          DBUG_ASSERT(false);
          // Stop setting bounds but continue with what we have
          DBUG_RETURN(0);
        }
      }
    }

    // Seen with e.g. b = 1 and c > 1
    if (part[0].bound_type == NdbIndexScanOperation::BoundLE &&
        part[1].bound_type == NdbIndexScanOperation::BoundGE &&
        memcmp(part[0].part_ptr, part[1].part_ptr, part_store_len) == 0)
    {
      DBUG_PRINT("info", ("replace LE/GE pair by EQ"));
      part[0].bound_type= NdbIndexScanOperation::BoundEQ;
      part[1].bound_type= -1;
    }
    // Not seen but was in previous version
    if (part[0].bound_type == NdbIndexScanOperation::BoundEQ &&
        part[1].bound_type == NdbIndexScanOperation::BoundGE &&
        memcmp(part[0].part_ptr, part[1].part_ptr, part_store_len) == 0)
    {
      DBUG_PRINT("info", ("remove GE from EQ/GE pair"));
      part[1].bound_type= -1;
    }

    for (j= 0; j <= 1; j++)
    {
      struct part_st &p = part[j];
      // Set bound if not done with this key
      if (p.key != NULL)
      {
        DBUG_PRINT("info", ("key %d:%d offset=%d length=%d last=%d bound=%d",
                            j, i, tot_len, part_len, p.part_last, p.bound_type));
        DBUG_DUMP("info", (const char*)p.part_ptr, part_store_len);

        // Set bound if not cancelled via type -1
        if (p.bound_type != -1)
	{
	  char truncated_field_name[NDB_MAX_ATTR_NAME_SIZE];
	  strnmov(truncated_field_name,field->field_name,sizeof(truncated_field_name));
	  truncated_field_name[sizeof(truncated_field_name)-1]= '\0';
          if (op->setBound(truncated_field_name, p.bound_type, p.bound_ptr))
            ERR_RETURN(op->getNdbError());
	}
      }
    }

    tot_len+= part_store_len;
  }
  DBUG_RETURN(0);
}

inline 
int ha_ndbcluster::define_read_attrs(byte* buf, NdbOperation* op)
{
  uint i;
  THD *thd= current_thd;
  NdbConnection *trans= m_active_trans;

  DBUG_ENTER("define_read_attrs");  

  // Define attributes to read
  for (i= 0; i < table->fields; i++) 
  {
    Field *field= table->field[i];
    if ((thd->query_id == field->query_id) ||
	(field->flags & PRI_KEY_FLAG) || 
	m_retrieve_all_fields)
    {      
      if (get_ndb_value(op, field, i, buf))
	ERR_RETURN(op->getNdbError());
    } 
    else 
    {
      m_value[i].ptr= NULL;
    }
  }
    
  if (table->primary_key == MAX_KEY) 
  {
    DBUG_PRINT("info", ("Getting hidden key"));
    // Scanning table with no primary key
    int hidden_no= table->fields;      
#ifndef DBUG_OFF
    const NDBTAB *tab= (const NDBTAB *) m_table;    
    if (!tab->getColumn(hidden_no))
      DBUG_RETURN(1);
#endif
    if (get_ndb_value(op, NULL, hidden_no, NULL))
      ERR_RETURN(op->getNdbError());
  }

  if (execute_no_commit(this,trans) != 0)
    DBUG_RETURN(ndb_err(trans));
  DBUG_PRINT("exit", ("Scan started successfully"));
  DBUG_RETURN(next_result(buf));
} 

/*
  Start ordered index scan in NDB
*/

int ha_ndbcluster::ordered_index_scan(const key_range *start_key,
				      const key_range *end_key,
				      bool sorted, byte* buf)
{  
  bool restart;
  NdbConnection *trans= m_active_trans;
  NdbResultSet *cursor;
  NdbIndexScanOperation *op;

  DBUG_ENTER("ordered_index_scan");
  DBUG_PRINT("enter", ("index: %u, sorted: %d", active_index, sorted));  
  DBUG_PRINT("enter", ("Starting new ordered scan on %s", m_tabname));

  // Check that sorted seems to be initialised
  DBUG_ASSERT(sorted == 0 || sorted == 1);
  
  if (m_active_cursor == 0)
  {
    restart= false;
    NdbOperation::LockMode lm=
      (NdbOperation::LockMode)get_ndb_lock_type(m_lock.type);
    if (!(op= trans->getNdbIndexScanOperation((NDBINDEX *)
					      m_index[active_index].index, 
					      (const NDBTAB *) m_table)) ||
	!(cursor= op->readTuples(lm, 0, parallelism, sorted)))
      ERR_RETURN(trans->getNdbError());
    m_active_cursor= cursor;
  } else {
    restart= true;
    op= (NdbIndexScanOperation*)m_active_cursor->getOperation();
    
    DBUG_ASSERT(op->getSorted() == sorted);
    DBUG_ASSERT(op->getLockMode() == 
		(NdbOperation::LockMode)get_ndb_lock_type(m_lock.type));
    if(op->reset_bounds(m_force_send))
      DBUG_RETURN(ndb_err(m_active_trans));
  }

  {
    const key_range *keys[2]= { start_key, end_key };
    int ret= set_bounds(op, keys);
    if (ret)
      DBUG_RETURN(ret);
  }

  if (!restart)
  {
    DBUG_RETURN(define_read_attrs(buf, op));
  }
  else
  {
    if (execute_no_commit(this,trans) != 0)
      DBUG_RETURN(ndb_err(trans));
    
    DBUG_RETURN(next_result(buf));
  }
} 

/*
  Start a filtered scan in NDB.

  NOTE
  This function is here as an example of how to start a
  filtered scan. It should be possible to replace full_table_scan 
  with this function and make a best effort attempt 
  at filtering out the irrelevant data by converting the "items" 
  into interpreted instructions.
  This would speed up table scans where there is a limiting WHERE clause
  that doesn't match any index in the table.

 */

int ha_ndbcluster::filtered_scan(const byte *key, uint key_len, 
				 byte *buf,
				 enum ha_rkey_function find_flag)
{  
  NdbConnection *trans= m_active_trans;
  NdbResultSet *cursor;
  NdbScanOperation *op;

  DBUG_ENTER("filtered_scan");
  DBUG_PRINT("enter", ("key_len: %u, index: %u", 
                       key_len, active_index));
  DBUG_DUMP("key", (char*)key, key_len);  
  DBUG_PRINT("info", ("Starting a new filtered scan on %s",
		      m_tabname));

  NdbOperation::LockMode lm=
    (NdbOperation::LockMode)get_ndb_lock_type(m_lock.type);
  if (!(op= trans->getNdbScanOperation((const NDBTAB *) m_table)) ||
      !(cursor= op->readTuples(lm, 0, parallelism)))
    ERR_RETURN(trans->getNdbError());
  m_active_cursor= cursor;
  
  {
    // Start scan filter
    NdbScanFilter sf(op);
    sf.begin();
      
    // Set filter using the supplied key data
    byte *key_ptr= (byte *) key;    
    uint tot_len= 0;
    KEY* key_info= table->key_info + active_index;
    for (uint k= 0; k < key_info->key_parts; k++) 
    {
      KEY_PART_INFO* key_part= key_info->key_part+k;
      Field* field= key_part->field;
      uint ndb_fieldnr= key_part->fieldnr-1;
      DBUG_PRINT("key_part", ("fieldnr: %d", ndb_fieldnr));
      //const NDBCOL *col= ((const NDBTAB *) m_table)->getColumn(ndb_fieldnr);
      uint32 field_len=  field->pack_length();
      DBUG_DUMP("key", (char*)key, field_len);
	
      DBUG_PRINT("info", ("Column %s, type: %d, len: %d", 
			  field->field_name, field->real_type(), field_len));
	
      // Define scan filter
      if (field->real_type() == MYSQL_TYPE_STRING)
	sf.eq(ndb_fieldnr, key_ptr, field_len);
      else 
      {
	if (field_len == 8)
	  sf.eq(ndb_fieldnr, (Uint64)*key_ptr);
	else if (field_len <= 4)
	  sf.eq(ndb_fieldnr, (Uint32)*key_ptr);
	else 
	  DBUG_RETURN(1);
      }
	
      key_ptr += field_len;
      tot_len += field_len;
	
      if (tot_len >= key_len)
	break;
    }
    // End scan filter
    sf.end();
  }

  DBUG_RETURN(define_read_attrs(buf, op));
} 


/*
  Start full table scan in NDB
 */

int ha_ndbcluster::full_table_scan(byte *buf)
{
  uint i;
  NdbResultSet *cursor;
  NdbScanOperation *op;
  NdbConnection *trans= m_active_trans;

  DBUG_ENTER("full_table_scan");  
  DBUG_PRINT("enter", ("Starting new scan on %s", m_tabname));

  NdbOperation::LockMode lm=
    (NdbOperation::LockMode)get_ndb_lock_type(m_lock.type);
  if (!(op=trans->getNdbScanOperation((const NDBTAB *) m_table)) ||
      !(cursor= op->readTuples(lm, 0, parallelism)))
    ERR_RETURN(trans->getNdbError());
  m_active_cursor= cursor;
  DBUG_RETURN(define_read_attrs(buf, op));
}

/*
  Insert one record into NDB
*/
int ha_ndbcluster::write_row(byte *record)
{
  bool has_auto_increment;
  uint i;
  NdbConnection *trans= m_active_trans;
  NdbOperation *op;
  int res;
  DBUG_ENTER("write_row");

  if(m_ignore_dup_key && table->primary_key != MAX_KEY)
  {
    int peek_res= peek_row();
    
    if (!peek_res) 
    {
      m_dupkey= table->primary_key;
      DBUG_RETURN(HA_ERR_FOUND_DUPP_KEY);
    }
    if (peek_res != HA_ERR_KEY_NOT_FOUND)
      DBUG_RETURN(peek_res);
  }
  
  statistic_increment(ha_write_count,&LOCK_status);
  if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
    table->timestamp_field->set_time();
  has_auto_increment= (table->next_number_field && record == table->record[0]);

  if (!(op= trans->getNdbOperation((const NDBTAB *) m_table)))
    ERR_RETURN(trans->getNdbError());

  res= (m_use_write) ? op->writeTuple() :op->insertTuple(); 
  if (res != 0)
    ERR_RETURN(trans->getNdbError());  
 
  if (table->primary_key == MAX_KEY) 
  {
    // Table has hidden primary key
    Ndb *ndb= get_ndb();
    Uint64 auto_value= ndb->getAutoIncrementValue((const NDBTAB *) m_table);
    if (set_hidden_key(op, table->fields, (const byte*)&auto_value))
      ERR_RETURN(op->getNdbError());
  } 
  else 
  {
    int res;

    if (has_auto_increment) 
    {
      m_skip_auto_increment= FALSE;
      update_auto_increment();
      m_skip_auto_increment= !auto_increment_column_changed;
    }

    if ((res= set_primary_key(op)))
      return res;
  }

  // Set non-key attribute(s)
  bool set_blob_value= FALSE;
  for (i= 0; i < table->fields; i++) 
  {
    Field *field= table->field[i];
    if (!(field->flags & PRI_KEY_FLAG) &&
	set_ndb_value(op, field, i, &set_blob_value))
    {
      m_skip_auto_increment= TRUE;
      ERR_RETURN(op->getNdbError());
    }
  }

  /*
    Execute write operation
    NOTE When doing inserts with many values in 
    each INSERT statement it should not be necessary
    to NoCommit the transaction between each row.
    Find out how this is detected!
  */
  m_rows_inserted++;
  no_uncommitted_rows_update(1);
  m_bulk_insert_not_flushed= TRUE;
  if ((m_rows_to_insert == 1) || 
      ((m_rows_inserted % m_bulk_insert_rows) == 0) ||
      set_blob_value)
  {
    THD *thd= current_thd;
    // Send rows to NDB
    DBUG_PRINT("info", ("Sending inserts to NDB, "\
			"rows_inserted:%d, bulk_insert_rows: %d", 
			(int)m_rows_inserted, (int)m_bulk_insert_rows));

    m_bulk_insert_not_flushed= FALSE;
    //    if (thd->transaction.on)
    if (m_transaction_on)
    {
      if (execute_no_commit(this,trans) != 0)
      {
	m_skip_auto_increment= TRUE;
	no_uncommitted_rows_execute_failure();
	DBUG_RETURN(ndb_err(trans));
      }
    }
    else
    {
      if (execute_commit(this,trans) != 0)
      {
	m_skip_auto_increment= TRUE;
	no_uncommitted_rows_execute_failure();
	DBUG_RETURN(ndb_err(trans));
      }
      int res= trans->restart();
      DBUG_ASSERT(res == 0);
    }
  }
  if ((has_auto_increment) && (m_skip_auto_increment))
  {
    Ndb *ndb= get_ndb();
    Uint64 next_val= (Uint64) table->next_number_field->val_int() + 1;
    DBUG_PRINT("info", 
	       ("Trying to set next auto increment value to %lu",
                (ulong) next_val));
    if (ndb->setAutoIncrementValue((const NDBTAB *) m_table, next_val, TRUE))
      DBUG_PRINT("info", 
		 ("Setting next auto increment value to %u", next_val));  
  }
  m_skip_auto_increment= TRUE;

  DBUG_RETURN(0);
}


/* Compare if a key in a row has changed */

int ha_ndbcluster::key_cmp(uint keynr, const byte * old_row,
			   const byte * new_row)
{
  KEY_PART_INFO *key_part=table->key_info[keynr].key_part;
  KEY_PART_INFO *end=key_part+table->key_info[keynr].key_parts;

  for (; key_part != end ; key_part++)
  {
    if (key_part->null_bit)
    {
      if ((old_row[key_part->null_offset] & key_part->null_bit) !=
	  (new_row[key_part->null_offset] & key_part->null_bit))
	return 1;
    }
    if (key_part->key_part_flag & (HA_BLOB_PART | HA_VAR_LENGTH))
    {

      if (key_part->field->cmp_binary((char*) (old_row + key_part->offset),
				      (char*) (new_row + key_part->offset),
				      (ulong) key_part->length))
	return 1;
    }
    else
    {
      if (memcmp(old_row+key_part->offset, new_row+key_part->offset,
		 key_part->length))
	return 1;
    }
  }
  return 0;
}

/*
  Update one record in NDB using primary key
*/

int ha_ndbcluster::update_row(const byte *old_data, byte *new_data)
{
  THD *thd= current_thd;
  NdbConnection *trans= m_active_trans;
  NdbResultSet* cursor= m_active_cursor;
  NdbOperation *op;
  uint i;
  DBUG_ENTER("update_row");
  
  statistic_increment(ha_update_count,&LOCK_status);
  if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
    table->timestamp_field->set_time();

  /* Check for update of primary key for special handling */  
  if ((table->primary_key != MAX_KEY) &&
      (key_cmp(table->primary_key, old_data, new_data)))
  {
    int read_res, insert_res, delete_res;

    DBUG_PRINT("info", ("primary key update, doing pk read+insert+delete"));
    // Get all old fields, since we optimize away fields not in query
    read_res= complemented_pk_read(old_data, new_data);
    if (read_res)
    {
      DBUG_PRINT("info", ("pk read failed"));
      DBUG_RETURN(read_res);
    }
    // Insert new row
    insert_res= write_row(new_data);
    if (insert_res)
    {
      DBUG_PRINT("info", ("insert failed"));
      DBUG_RETURN(insert_res);
    }
    // Delete old row
    DBUG_PRINT("info", ("insert succeded"));
    m_primary_key_update= TRUE;
    delete_res= delete_row(old_data);
    m_primary_key_update= FALSE;
    if (delete_res)
    {
      DBUG_PRINT("info", ("delete failed"));
      // Undo write_row(new_data)
      DBUG_RETURN(delete_row(new_data));
    }     
    DBUG_PRINT("info", ("insert+delete succeeded"));
    DBUG_RETURN(0);
  }

  if (cursor)
  {
    /*
      We are scanning records and want to update the record
      that was just found, call updateTuple on the cursor 
      to take over the lock to a new update operation
      And thus setting the primary key of the record from 
      the active record in cursor
    */
    DBUG_PRINT("info", ("Calling updateTuple on cursor"));
    if (!(op= cursor->updateTuple()))
      ERR_RETURN(trans->getNdbError());
    m_ops_pending++;
    if (uses_blob_value(FALSE))
      m_blobs_pending= TRUE;
  }
  else
  {  
    if (!(op= trans->getNdbOperation((const NDBTAB *) m_table)) ||
	op->updateTuple() != 0)
      ERR_RETURN(trans->getNdbError());  
    
    if (table->primary_key == MAX_KEY) 
    {
      // This table has no primary key, use "hidden" primary key
      DBUG_PRINT("info", ("Using hidden key"));
      
      // Require that the PK for this record has previously been 
      // read into m_value
      uint no_fields= table->fields;
      NdbRecAttr* rec= m_value[no_fields].rec;
      DBUG_ASSERT(rec);
      DBUG_DUMP("key", (char*)rec->aRef(), NDB_HIDDEN_PRIMARY_KEY_LENGTH);
      
      if (set_hidden_key(op, no_fields, rec->aRef()))
	ERR_RETURN(op->getNdbError());
    } 
    else 
    {
      int res;
      if ((res= set_primary_key_from_old_data(op, old_data)))
	DBUG_RETURN(res);
    }
  }

  // Set non-key attribute(s)
  for (i= 0; i < table->fields; i++) 
  {
    Field *field= table->field[i];
    if (((thd->query_id == field->query_id) || m_retrieve_all_fields) &&
        (!(field->flags & PRI_KEY_FLAG)) &&
	set_ndb_value(op, field, i))
      ERR_RETURN(op->getNdbError());
  }

  // Execute update operation
  if (!cursor && execute_no_commit(this,trans) != 0) {
    no_uncommitted_rows_execute_failure();
    DBUG_RETURN(ndb_err(trans));
  }
  
  DBUG_RETURN(0);
}


/*
  Delete one record from NDB, using primary key 
*/

int ha_ndbcluster::delete_row(const byte *record)
{
  NdbConnection *trans= m_active_trans;
  NdbResultSet* cursor= m_active_cursor;
  NdbOperation *op;
  DBUG_ENTER("delete_row");

  statistic_increment(ha_delete_count,&LOCK_status);

  if (cursor)
  {
    /*
      We are scanning records and want to delete the record
      that was just found, call deleteTuple on the cursor 
      to take over the lock to a new delete operation
      And thus setting the primary key of the record from 
      the active record in cursor
    */
    DBUG_PRINT("info", ("Calling deleteTuple on cursor"));
    if (cursor->deleteTuple() != 0)
      ERR_RETURN(trans->getNdbError());     
    m_ops_pending++;

    no_uncommitted_rows_update(-1);

    // If deleting from cursor, NoCommit will be handled in next_result
    DBUG_RETURN(0);
  }
  else
  {
    
    if (!(op=trans->getNdbOperation((const NDBTAB *) m_table)) || 
	op->deleteTuple() != 0)
      ERR_RETURN(trans->getNdbError());
    
    no_uncommitted_rows_update(-1);
    
    if (table->primary_key == MAX_KEY) 
    {
      // This table has no primary key, use "hidden" primary key
      DBUG_PRINT("info", ("Using hidden key"));
      uint no_fields= table->fields;
      NdbRecAttr* rec= m_value[no_fields].rec;
      DBUG_ASSERT(rec != NULL);
      
      if (set_hidden_key(op, no_fields, rec->aRef()))
	ERR_RETURN(op->getNdbError());
    } 
    else 
    {
      int res;
      if ((res= (m_primary_key_update ?
		 set_primary_key_from_old_data(op, record)
		 : set_primary_key(op))))
	  return res;  
    }
  }
  
  // Execute delete operation
  if (execute_no_commit(this,trans) != 0) {
    no_uncommitted_rows_execute_failure();
    DBUG_RETURN(ndb_err(trans));
  }
  DBUG_RETURN(0);
}
  
/*
  Unpack a record read from NDB 

  SYNOPSIS
    unpack_record()
    buf			Buffer to store read row

  NOTE
    The data for each row is read directly into the
    destination buffer. This function is primarily 
    called in order to check if any fields should be 
    set to null.
*/

void ha_ndbcluster::unpack_record(byte* buf)
{
  uint row_offset= (uint) (buf - table->record[0]);
  Field **field, **end;
  NdbValue *value= m_value;
  DBUG_ENTER("unpack_record");
  
  // Set null flag(s)
  bzero(buf, table->null_bytes);
  for (field= table->field, end= field+table->fields;
       field < end;
       field++, value++)
  {
    if ((*value).ptr)
    {
      if (! ((*field)->flags & BLOB_FLAG))
      {
        if ((*value).rec->isNULL())
         (*field)->set_null(row_offset);
      }
      else
      {
        NdbBlob* ndb_blob= (*value).blob;
        bool isNull= TRUE;
        int ret= ndb_blob->getNull(isNull);
        DBUG_ASSERT(ret == 0);
        if (isNull)
         (*field)->set_null(row_offset);
      }
    }
  }

#ifndef DBUG_OFF
  // Read and print all values that was fetched
  if (table->primary_key == MAX_KEY)
  {
    // Table with hidden primary key
    int hidden_no= table->fields;
    const NDBTAB *tab= (const NDBTAB *) m_table;
    const NDBCOL *hidden_col= tab->getColumn(hidden_no);
    NdbRecAttr* rec= m_value[hidden_no].rec;
    DBUG_ASSERT(rec);
    DBUG_PRINT("hidden", ("%d: %s \"%llu\"", hidden_no, 
                          hidden_col->getName(), rec->u_64_value()));
  } 
  print_results();
#endif
  DBUG_VOID_RETURN;
}

/*
  Utility function to print/dump the fetched field
 */

void ha_ndbcluster::print_results()
{
  const NDBTAB *tab= (const NDBTAB*) m_table;
  DBUG_ENTER("print_results");

#ifndef DBUG_OFF
  if (!_db_on_)
    DBUG_VOID_RETURN;
  
  for (uint f=0; f<table->fields;f++)
  {
    Field *field;
    const NDBCOL *col;
    NdbValue value;

    if (!(value= m_value[f]).ptr)
    {
      fprintf(DBUG_FILE, "Field %d was not read\n", f);
      continue;
    }
    field= table->field[f];
    DBUG_DUMP("field->ptr", (char*)field->ptr, field->pack_length());
    col= tab->getColumn(f);
    fprintf(DBUG_FILE, "%d: %s\t", f, col->getName());

    NdbBlob *ndb_blob= NULL;
    if (! (field->flags & BLOB_FLAG))
    {
      if (value.rec->isNULL())
      {
        fprintf(DBUG_FILE, "NULL\n");
        continue;
      }
    }
    else
    {
      ndb_blob= value.blob;
      bool isNull= TRUE;
      ndb_blob->getNull(isNull);
      if (isNull) {
        fprintf(DBUG_FILE, "NULL\n");
        continue;
      }
    }

    switch (col->getType()) {
    case NdbDictionary::Column::Tinyint: {
      char value= *field->ptr;
      fprintf(DBUG_FILE, "Tinyint\t%d", value);
      break;
    }
    case NdbDictionary::Column::Tinyunsigned: {
      unsigned char value= *field->ptr;
      fprintf(DBUG_FILE, "Tinyunsigned\t%u", value);
      break;
    }
    case NdbDictionary::Column::Smallint: {
      short value= *field->ptr;
      fprintf(DBUG_FILE, "Smallint\t%d", value);
      break;
    }
    case NdbDictionary::Column::Smallunsigned: {
      unsigned short value= *field->ptr;
      fprintf(DBUG_FILE, "Smallunsigned\t%u", value);
      break;
    }
    case NdbDictionary::Column::Mediumint: {
      byte value[3];
      memcpy(value, field->ptr, 3);
      fprintf(DBUG_FILE, "Mediumint\t%d,%d,%d", value[0], value[1], value[2]);
      break;
    }
    case NdbDictionary::Column::Mediumunsigned: {
      byte value[3];
      memcpy(value, field->ptr, 3);
      fprintf(DBUG_FILE, "Mediumunsigned\t%u,%u,%u", value[0], value[1], value[2]);
      break;
    }
    case NdbDictionary::Column::Int: {
      fprintf(DBUG_FILE, "Int\t%lld", field->val_int());
      break;
    }
    case NdbDictionary::Column::Unsigned: {
      Uint32 value= (Uint32) *field->ptr;
      fprintf(DBUG_FILE, "Unsigned\t%u", value);
      break;
    }
    case NdbDictionary::Column::Bigint: {
      Int64 value= (Int64) *field->ptr;
      fprintf(DBUG_FILE, "Bigint\t%lld", value);
      break;
    }
    case NdbDictionary::Column::Bigunsigned: {
      Uint64 value= (Uint64) *field->ptr;
      fprintf(DBUG_FILE, "Bigunsigned\t%llu", value);
      break;
    }
    case NdbDictionary::Column::Float: {
      float value= (float) *field->ptr;
      fprintf(DBUG_FILE, "Float\t%f", value);
      break;
    }
    case NdbDictionary::Column::Double: {
      double value= (double) *field->ptr;
      fprintf(DBUG_FILE, "Double\t%f", value);
      break;
    }
    case NdbDictionary::Column::Decimal: {
      char *value= field->ptr;

      fprintf(DBUG_FILE, "Decimal\t'%-*s'", field->pack_length(), value);
      break;
    }
    case NdbDictionary::Column::Char:{
      const char *value= (char *) field->ptr;
      fprintf(DBUG_FILE, "Char\t'%.*s'", field->pack_length(), value);
      break;
    }
    case NdbDictionary::Column::Varchar:
    case NdbDictionary::Column::Binary:
    case NdbDictionary::Column::Varbinary: {
      const char *value= (char *) field->ptr;
      fprintf(DBUG_FILE, "Var\t'%.*s'", field->pack_length(), value);
      break;
    }
    case NdbDictionary::Column::Datetime: {
      Uint64 value= (Uint64) *field->ptr;
      fprintf(DBUG_FILE, "Datetime\t%llu", value);
      break;
    }
    case NdbDictionary::Column::Timespec: {
      Uint64 value= (Uint64) *field->ptr;
      fprintf(DBUG_FILE, "Timespec\t%llu", value);
      break;
    }
    case NdbDictionary::Column::Blob: {
      Uint64 len= 0;
      ndb_blob->getLength(len);
      fprintf(DBUG_FILE, "Blob\t[len=%u]", (unsigned)len);
      break;
    }
    case NdbDictionary::Column::Text: {
      Uint64 len= 0;
      ndb_blob->getLength(len);
      fprintf(DBUG_FILE, "Text\t[len=%u]", (unsigned)len);
      break;
    }
    case NdbDictionary::Column::Undefined:
      fprintf(DBUG_FILE, "Unknown type: %d", col->getType());
      break;
    }
    fprintf(DBUG_FILE, "\n");
    
  }
#endif
  DBUG_VOID_RETURN;
}


int ha_ndbcluster::index_init(uint index)
{
  DBUG_ENTER("index_init");
  DBUG_PRINT("enter", ("index: %u", index));
  DBUG_RETURN(handler::index_init(index));
}


int ha_ndbcluster::index_end()
{
  DBUG_ENTER("index_end");
  DBUG_RETURN(close_scan());
}

/**
 * Check if key contains null
 */
static
int
check_null_in_key(const KEY* key_info, const byte *key, uint key_len)
{
  KEY_PART_INFO *curr_part, *end_part;
  const byte* end_ptr = key + key_len;
  curr_part= key_info->key_part;
  end_part= curr_part + key_info->key_parts;
  

  for (; curr_part != end_part && key < end_ptr; curr_part++)
  {
    if(curr_part->null_bit && *key)
      return 1;

    key += curr_part->store_length;
  }
  return 0;
}

int ha_ndbcluster::index_read(byte *buf,
			      const byte *key, uint key_len, 
			      enum ha_rkey_function find_flag)
{
  DBUG_ENTER("index_read");
  DBUG_PRINT("enter", ("active_index: %u, key_len: %u, find_flag: %d", 
                       active_index, key_len, find_flag));

  int error;
  ndb_index_type type = get_index_type(active_index);
  const KEY* key_info = table->key_info+active_index;
  switch (type){
  case PRIMARY_KEY_ORDERED_INDEX:
  case PRIMARY_KEY_INDEX:
    if (find_flag == HA_READ_KEY_EXACT && key_info->key_length == key_len)
    {
      if(m_active_cursor && (error= close_scan()))
	DBUG_RETURN(error);
      DBUG_RETURN(pk_read(key, key_len, buf));
    }
    else if (type == PRIMARY_KEY_INDEX)
    {
      DBUG_RETURN(1);
    }
    break;
  case UNIQUE_ORDERED_INDEX:
  case UNIQUE_INDEX:
    if (find_flag == HA_READ_KEY_EXACT && key_info->key_length == key_len &&
	!check_null_in_key(key_info, key, key_len))
    {
      if(m_active_cursor && (error= close_scan()))
	DBUG_RETURN(error);
      DBUG_RETURN(unique_index_read(key, key_len, buf));
    }
    else if (type == UNIQUE_INDEX)
    {
      DBUG_RETURN(1);
    }
    break;
  case ORDERED_INDEX:
    break;
  default:
  case UNDEFINED_INDEX:
    DBUG_ASSERT(FALSE);
    DBUG_RETURN(1);
    break;
  }
  
  key_range start_key;
  start_key.key = key;
  start_key.length = key_len;
  start_key.flag = find_flag;
  error= ordered_index_scan(&start_key, 0, TRUE, buf);  
  DBUG_RETURN(error == HA_ERR_END_OF_FILE ? HA_ERR_KEY_NOT_FOUND : error);
}


int ha_ndbcluster::index_read_idx(byte *buf, uint index_no, 
			      const byte *key, uint key_len, 
			      enum ha_rkey_function find_flag)
{
  statistic_increment(ha_read_key_count,&LOCK_status);
  DBUG_ENTER("index_read_idx");
  DBUG_PRINT("enter", ("index_no: %u, key_len: %u", index_no, key_len));  
  index_init(index_no);  
  DBUG_RETURN(index_read(buf, key, key_len, find_flag));
}


int ha_ndbcluster::index_next(byte *buf)
{
  DBUG_ENTER("index_next");

  int error= 1;
  statistic_increment(ha_read_next_count,&LOCK_status);
  DBUG_RETURN(next_result(buf));
}


int ha_ndbcluster::index_prev(byte *buf)
{
  DBUG_ENTER("index_prev");
  statistic_increment(ha_read_prev_count,&LOCK_status);
  DBUG_RETURN(1);
}


int ha_ndbcluster::index_first(byte *buf)
{
  DBUG_ENTER("index_first");
  statistic_increment(ha_read_first_count,&LOCK_status);
  // Start the ordered index scan and fetch the first row

  // Only HA_READ_ORDER indexes get called by index_first
  DBUG_RETURN(ordered_index_scan(0, 0, TRUE, buf));
}


int ha_ndbcluster::index_last(byte *buf)
{
  DBUG_ENTER("index_last");
  statistic_increment(ha_read_last_count,&LOCK_status);
  int res;
  if((res= ordered_index_scan(0, 0, TRUE, buf)) == 0){
    NdbResultSet *cursor= m_active_cursor; 
    while((res= cursor->nextResult(TRUE, m_force_send)) == 0);
    if(res == 1){
      unpack_record(buf);
      table->status= 0;     
      DBUG_RETURN(0);
    }
  }
  DBUG_RETURN(res);
}


inline
int ha_ndbcluster::read_range_first_to_buf(const key_range *start_key,
					   const key_range *end_key,
					   bool eq_range, bool sorted,
					   byte* buf)
{
  KEY* key_info;
  int error= 1; 
  DBUG_ENTER("ha_ndbcluster::read_range_first_to_buf");
  DBUG_PRINT("info", ("eq_range: %d, sorted: %d", eq_range, sorted));

  switch (get_index_type(active_index)){
  case PRIMARY_KEY_ORDERED_INDEX:
  case PRIMARY_KEY_INDEX:
    key_info= table->key_info + active_index;
    if (start_key && 
	start_key->length == key_info->key_length &&
	start_key->flag == HA_READ_KEY_EXACT)
    {
      if(m_active_cursor && (error= close_scan()))
	DBUG_RETURN(error);
      error= pk_read(start_key->key, start_key->length, buf);      
      DBUG_RETURN(error == HA_ERR_KEY_NOT_FOUND ? HA_ERR_END_OF_FILE : error);
    }
    break;
  case UNIQUE_ORDERED_INDEX:
  case UNIQUE_INDEX:
    key_info= table->key_info + active_index;
    if (start_key && start_key->length == key_info->key_length &&
	start_key->flag == HA_READ_KEY_EXACT && 
	!check_null_in_key(key_info, start_key->key, start_key->length))
    {
      if(m_active_cursor && (error= close_scan()))
	DBUG_RETURN(error);
      error= unique_index_read(start_key->key, start_key->length, buf);
      DBUG_RETURN(error == HA_ERR_KEY_NOT_FOUND ? HA_ERR_END_OF_FILE : error);
    }
    break;
  default:
    break;
  }

  // Start the ordered index scan and fetch the first row
  error= ordered_index_scan(start_key, end_key, sorted, buf);
  DBUG_RETURN(error);
}


int ha_ndbcluster::read_range_first(const key_range *start_key,
				    const key_range *end_key,
				    bool eq_range, bool sorted)
{
  byte* buf= table->record[0];
  DBUG_ENTER("ha_ndbcluster::read_range_first");
  
  DBUG_RETURN(read_range_first_to_buf(start_key,
				      end_key,
				      eq_range, 
				      sorted,
				      buf));
}

int ha_ndbcluster::read_range_next()
{
  DBUG_ENTER("ha_ndbcluster::read_range_next");
  DBUG_RETURN(next_result(table->record[0]));
}


int ha_ndbcluster::rnd_init(bool scan)
{
  NdbResultSet *cursor= m_active_cursor;
  DBUG_ENTER("rnd_init");
  DBUG_PRINT("enter", ("scan: %d", scan));
  // Check if scan is to be restarted
  if (cursor)
  {
    if (!scan)
      DBUG_RETURN(1);
    int res= cursor->restart(m_force_send);
    DBUG_ASSERT(res == 0);
  }
  index_init(table->primary_key);
  DBUG_RETURN(0);
}

int ha_ndbcluster::close_scan()
{
  NdbResultSet *cursor= m_active_cursor;
  NdbConnection *trans= m_active_trans;
  DBUG_ENTER("close_scan");

  if (!cursor)
    DBUG_RETURN(1);

  
  if (m_ops_pending)
  {
    /*
      Take over any pending transactions to the 
      deleteing/updating transaction before closing the scan    
    */
    DBUG_PRINT("info", ("ops_pending: %d", m_ops_pending));    
    if (execute_no_commit(this,trans) != 0) {
      no_uncommitted_rows_execute_failure();
      DBUG_RETURN(ndb_err(trans));
    }
    m_ops_pending= 0;
  }
  
  cursor->close(m_force_send);
  m_active_cursor= NULL;
  DBUG_RETURN(0);
}

int ha_ndbcluster::rnd_end()
{
  DBUG_ENTER("rnd_end");
  DBUG_RETURN(close_scan());
}


int ha_ndbcluster::rnd_next(byte *buf)
{
  DBUG_ENTER("rnd_next");
  statistic_increment(ha_read_rnd_next_count, &LOCK_status);

  if (!m_active_cursor)
    DBUG_RETURN(full_table_scan(buf));
  DBUG_RETURN(next_result(buf));
}


/*
  An "interesting" record has been found and it's pk 
  retrieved by calling position
  Now it's time to read the record from db once 
  again
*/

int ha_ndbcluster::rnd_pos(byte *buf, byte *pos)
{
  DBUG_ENTER("rnd_pos");
  statistic_increment(ha_read_rnd_count,&LOCK_status);
  // The primary key for the record is stored in pos
  // Perform a pk_read using primary key "index"
  DBUG_RETURN(pk_read(pos, ref_length, buf));  
}


/*
  Store the primary key of this record in ref 
  variable, so that the row can be retrieved again later
  using "reference" in rnd_pos
*/

void ha_ndbcluster::position(const byte *record)
{
  KEY *key_info;
  KEY_PART_INFO *key_part;
  KEY_PART_INFO *end;
  byte *buff;
  DBUG_ENTER("position");

  if (table->primary_key != MAX_KEY) 
  {
    key_info= table->key_info + table->primary_key;
    key_part= key_info->key_part;
    end= key_part + key_info->key_parts;
    buff= ref;
    
    for (; key_part != end; key_part++) 
    {
      if (key_part->null_bit) {
        /* Store 0 if the key part is a NULL part */      
        if (record[key_part->null_offset]
            & key_part->null_bit) {
          *buff++= 1;
          continue;
        }      
        *buff++= 0;
      }
      memcpy(buff, record + key_part->offset, key_part->length);
      buff += key_part->length;
    }
  } 
  else 
  {
    // No primary key, get hidden key
    DBUG_PRINT("info", ("Getting hidden key"));
    int hidden_no= table->fields;
    NdbRecAttr* rec= m_value[hidden_no].rec;
    const NDBTAB *tab= (const NDBTAB *) m_table;  
    const NDBCOL *hidden_col= tab->getColumn(hidden_no);
    DBUG_ASSERT(hidden_col->getPrimaryKey() && 
                hidden_col->getAutoIncrement() &&
                rec != NULL && 
                ref_length == NDB_HIDDEN_PRIMARY_KEY_LENGTH);
    memcpy(ref, (const void*)rec->aRef(), ref_length);
  }
  
  DBUG_DUMP("ref", (char*)ref, ref_length);
  DBUG_VOID_RETURN;
}


void ha_ndbcluster::info(uint flag)
{
  DBUG_ENTER("info");
  DBUG_PRINT("enter", ("flag: %d", flag));
  
  if (flag & HA_STATUS_POS)
    DBUG_PRINT("info", ("HA_STATUS_POS"));
  if (flag & HA_STATUS_NO_LOCK)
    DBUG_PRINT("info", ("HA_STATUS_NO_LOCK"));
  if (flag & HA_STATUS_TIME)
    DBUG_PRINT("info", ("HA_STATUS_TIME"));
  if (flag & HA_STATUS_VARIABLE)
  {
    DBUG_PRINT("info", ("HA_STATUS_VARIABLE"));
    if (m_table_info)
    {
      if (m_ha_not_exact_count)
	records= 100;
      else
	records_update();
    }
    else
    {
      if ((my_errno= check_ndb_connection()))
        DBUG_VOID_RETURN;
      Ndb *ndb= get_ndb();
      Uint64 rows= 100;
      if (current_thd->variables.ndb_use_exact_count)
	ndb_get_table_statistics(ndb, m_tabname, &rows, 0);
      records= rows;
    }
  }
  if (flag & HA_STATUS_CONST)
  {
    DBUG_PRINT("info", ("HA_STATUS_CONST"));
    set_rec_per_key();
  }
  if (flag & HA_STATUS_ERRKEY)
  {
    DBUG_PRINT("info", ("HA_STATUS_ERRKEY"));
    errkey= m_dupkey;
  }
  if (flag & HA_STATUS_AUTO)
    DBUG_PRINT("info", ("HA_STATUS_AUTO"));
  DBUG_VOID_RETURN;
}


int ha_ndbcluster::extra(enum ha_extra_function operation)
{
  DBUG_ENTER("extra");
  switch (operation) {
  case HA_EXTRA_NORMAL:              /* Optimize for space (def) */
    DBUG_PRINT("info", ("HA_EXTRA_NORMAL"));
    break;
  case HA_EXTRA_QUICK:                 /* Optimize for speed */
    DBUG_PRINT("info", ("HA_EXTRA_QUICK"));
    break;
  case HA_EXTRA_RESET:                 /* Reset database to after open */
    DBUG_PRINT("info", ("HA_EXTRA_RESET"));
    break;
  case HA_EXTRA_CACHE:                 /* Cash record in HA_rrnd() */
    DBUG_PRINT("info", ("HA_EXTRA_CACHE"));
    break;
  case HA_EXTRA_NO_CACHE:              /* End cacheing of records (def) */
    DBUG_PRINT("info", ("HA_EXTRA_NO_CACHE"));
    break;
  case HA_EXTRA_NO_READCHECK:          /* No readcheck on update */
    DBUG_PRINT("info", ("HA_EXTRA_NO_READCHECK"));
    break;
  case HA_EXTRA_READCHECK:             /* Use readcheck (def) */
    DBUG_PRINT("info", ("HA_EXTRA_READCHECK"));
    break;
  case HA_EXTRA_KEYREAD:               /* Read only key to database */
    DBUG_PRINT("info", ("HA_EXTRA_KEYREAD"));
    break;
  case HA_EXTRA_NO_KEYREAD:            /* Normal read of records (def) */
    DBUG_PRINT("info", ("HA_EXTRA_NO_KEYREAD"));
    break;
  case HA_EXTRA_NO_USER_CHANGE:        /* No user is allowed to write */
    DBUG_PRINT("info", ("HA_EXTRA_NO_USER_CHANGE"));
    break;
  case HA_EXTRA_KEY_CACHE:
    DBUG_PRINT("info", ("HA_EXTRA_KEY_CACHE"));
    break;
  case HA_EXTRA_NO_KEY_CACHE:
    DBUG_PRINT("info", ("HA_EXTRA_NO_KEY_CACHE"));
    break;
  case HA_EXTRA_WAIT_LOCK:            /* Wait until file is avalably (def) */
    DBUG_PRINT("info", ("HA_EXTRA_WAIT_LOCK"));
    break;
  case HA_EXTRA_NO_WAIT_LOCK:         /* If file is locked, return quickly */
    DBUG_PRINT("info", ("HA_EXTRA_NO_WAIT_LOCK"));
    break;
  case HA_EXTRA_WRITE_CACHE:           /* Use write cache in ha_write() */
    DBUG_PRINT("info", ("HA_EXTRA_WRITE_CACHE"));
    break;
  case HA_EXTRA_FLUSH_CACHE:           /* flush write_record_cache */
    DBUG_PRINT("info", ("HA_EXTRA_FLUSH_CACHE"));
    break;
  case HA_EXTRA_NO_KEYS:               /* Remove all update of keys */
    DBUG_PRINT("info", ("HA_EXTRA_NO_KEYS"));
    break;
  case HA_EXTRA_KEYREAD_CHANGE_POS:         /* Keyread, but change pos */
    DBUG_PRINT("info", ("HA_EXTRA_KEYREAD_CHANGE_POS")); /* xxxxchk -r must be used */
    break;                                  
  case HA_EXTRA_REMEMBER_POS:          /* Remember pos for next/prev */
    DBUG_PRINT("info", ("HA_EXTRA_REMEMBER_POS"));
    break;
  case HA_EXTRA_RESTORE_POS:
    DBUG_PRINT("info", ("HA_EXTRA_RESTORE_POS"));
    break;
  case HA_EXTRA_REINIT_CACHE:          /* init cache from current record */
    DBUG_PRINT("info", ("HA_EXTRA_REINIT_CACHE"));
    break;
  case HA_EXTRA_FORCE_REOPEN:          /* Datafile have changed on disk */
    DBUG_PRINT("info", ("HA_EXTRA_FORCE_REOPEN"));
    break;
  case HA_EXTRA_FLUSH:                 /* Flush tables to disk */
    DBUG_PRINT("info", ("HA_EXTRA_FLUSH"));
    break;
  case HA_EXTRA_NO_ROWS:               /* Don't write rows */
    DBUG_PRINT("info", ("HA_EXTRA_NO_ROWS"));
    break;
  case HA_EXTRA_RESET_STATE:           /* Reset positions */
    DBUG_PRINT("info", ("HA_EXTRA_RESET_STATE"));
    break;
  case HA_EXTRA_IGNORE_DUP_KEY:       /* Dup keys don't rollback everything*/
    DBUG_PRINT("info", ("HA_EXTRA_IGNORE_DUP_KEY"));
    if (current_thd->lex->sql_command == SQLCOM_REPLACE)
    {
      DBUG_PRINT("info", ("Turning ON use of write instead of insert"));
      m_use_write= TRUE;
    } else 
    {
      DBUG_PRINT("info", ("Ignoring duplicate key"));
      m_ignore_dup_key= TRUE;
    }
    break;
  case HA_EXTRA_NO_IGNORE_DUP_KEY:
    DBUG_PRINT("info", ("HA_EXTRA_NO_IGNORE_DUP_KEY"));
    DBUG_PRINT("info", ("Turning OFF use of write instead of insert"));
    m_use_write= FALSE;
    m_ignore_dup_key= FALSE;
    break;
  case HA_EXTRA_RETRIEVE_ALL_COLS:    /* Retrieve all columns, not just those
					 where field->query_id is the same as
					 the current query id */
    DBUG_PRINT("info", ("HA_EXTRA_RETRIEVE_ALL_COLS"));
    m_retrieve_all_fields= TRUE;
    break;
  case HA_EXTRA_PREPARE_FOR_DELETE:
    DBUG_PRINT("info", ("HA_EXTRA_PREPARE_FOR_DELETE"));
    break;
  case HA_EXTRA_PREPARE_FOR_UPDATE:     /* Remove read cache if problems */
    DBUG_PRINT("info", ("HA_EXTRA_PREPARE_FOR_UPDATE"));
    break;
  case HA_EXTRA_PRELOAD_BUFFER_SIZE: 
    DBUG_PRINT("info", ("HA_EXTRA_PRELOAD_BUFFER_SIZE"));
    break;
  case HA_EXTRA_RETRIEVE_PRIMARY_KEY: 
    DBUG_PRINT("info", ("HA_EXTRA_RETRIEVE_PRIMARY_KEY"));
    m_retrieve_primary_key= TRUE;
    break;
  case HA_EXTRA_CHANGE_KEY_TO_UNIQUE: 
    DBUG_PRINT("info", ("HA_EXTRA_CHANGE_KEY_TO_UNIQUE"));
    break;
  case HA_EXTRA_CHANGE_KEY_TO_DUP: 
    DBUG_PRINT("info", ("HA_EXTRA_CHANGE_KEY_TO_DUP"));
    break;

  }
  
  DBUG_RETURN(0);
}

/* 
   Start of an insert, remember number of rows to be inserted, it will
   be used in write_row and get_autoincrement to send an optimal number
   of rows in each roundtrip to the server

   SYNOPSIS
   rows     number of rows to insert, 0 if unknown

*/

void ha_ndbcluster::start_bulk_insert(ha_rows rows)
{
  int bytes, batch;
  const NDBTAB *tab= (const NDBTAB *) m_table;    

  DBUG_ENTER("start_bulk_insert");
  DBUG_PRINT("enter", ("rows: %d", (int)rows));
  
  m_rows_inserted= 0;
  m_rows_to_insert= rows; 

  /* 
    Calculate how many rows that should be inserted
    per roundtrip to NDB. This is done in order to minimize the 
    number of roundtrips as much as possible. However performance will 
    degrade if too many bytes are inserted, thus it's limited by this 
    calculation.   
  */
  const int bytesperbatch= 8192;
  bytes= 12 + tab->getRowSizeInBytes() + 4 * tab->getNoOfColumns();
  batch= bytesperbatch/bytes;
  batch= batch == 0 ? 1 : batch;
  DBUG_PRINT("info", ("batch: %d, bytes: %d", batch, bytes));
  m_bulk_insert_rows= batch;

  DBUG_VOID_RETURN;
}

/*
  End of an insert
 */
int ha_ndbcluster::end_bulk_insert()
{
  int error= 0;

  DBUG_ENTER("end_bulk_insert");
  // Check if last inserts need to be flushed
  if (m_bulk_insert_not_flushed)
  {
    NdbConnection *trans= m_active_trans;
    // Send rows to NDB
    DBUG_PRINT("info", ("Sending inserts to NDB, "\
                        "rows_inserted:%d, bulk_insert_rows: %d", 
                        m_rows_inserted, m_bulk_insert_rows)); 
    m_bulk_insert_not_flushed= FALSE;
    if (execute_no_commit(this,trans) != 0) {
      no_uncommitted_rows_execute_failure();
      my_errno= error= ndb_err(trans);
    }
  }

  m_rows_inserted= 0;
  m_rows_to_insert= 1;
  DBUG_RETURN(error);
}


int ha_ndbcluster::extra_opt(enum ha_extra_function operation, ulong cache_size)
{
  DBUG_ENTER("extra_opt");
  DBUG_PRINT("enter", ("cache_size: %lu", cache_size));
  DBUG_RETURN(extra(operation));
}


int ha_ndbcluster::reset()
{
  DBUG_ENTER("reset");
  // Reset what?
  DBUG_RETURN(1);
}

static const char *ha_ndb_bas_ext[]= { ha_ndb_ext, NullS };

const char**
ha_ndbcluster::bas_ext() const
{   
  return ha_ndb_bas_ext; 
}


/*
  How many seeks it will take to read through the table
  This is to be comparable to the number returned by records_in_range so
  that we can decide if we should scan the table or use keys.
*/

double ha_ndbcluster::scan_time()
{
  DBUG_ENTER("ha_ndbcluster::scan_time()");
  double res= rows2double(records*1000);
  DBUG_PRINT("exit", ("table: %s value: %f", 
		      m_tabname, res));
  DBUG_RETURN(res);
}


THR_LOCK_DATA **ha_ndbcluster::store_lock(THD *thd,
                                          THR_LOCK_DATA **to,
                                          enum thr_lock_type lock_type)
{
  DBUG_ENTER("store_lock");
  if (lock_type != TL_IGNORE && m_lock.type == TL_UNLOCK) 
  {

    /* If we are not doing a LOCK TABLE, then allow multiple
       writers */
    
    /* Since NDB does not currently have table locks
       this is treated as a ordinary lock */

    if ((lock_type >= TL_WRITE_ALLOW_WRITE &&
         lock_type <= TL_WRITE) && !thd->in_lock_tables)      
      lock_type= TL_WRITE_ALLOW_WRITE;
    
    /* In queries of type INSERT INTO t1 SELECT ... FROM t2 ...
       MySQL would use the lock TL_READ_NO_INSERT on t2, and that
       would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts
       to t2. Convert the lock to a normal read lock to allow
       concurrent inserts to t2. */
    
    if (lock_type == TL_READ_NO_INSERT && !thd->in_lock_tables)
      lock_type= TL_READ;
    
    m_lock.type=lock_type;
  }
  *to++= &m_lock;

  DBUG_PRINT("exit", ("lock_type: %d", lock_type));
  
  DBUG_RETURN(to);
}

#ifndef DBUG_OFF
#define PRINT_OPTION_FLAGS(t) { \
      if (t->options & OPTION_NOT_AUTOCOMMIT) \
        DBUG_PRINT("thd->options", ("OPTION_NOT_AUTOCOMMIT")); \
      if (t->options & OPTION_BEGIN) \
        DBUG_PRINT("thd->options", ("OPTION_BEGIN")); \
      if (t->options & OPTION_TABLE_LOCK) \
        DBUG_PRINT("thd->options", ("OPTION_TABLE_LOCK")); \
}
#else
#define PRINT_OPTION_FLAGS(t)
#endif


/*
  As MySQL will execute an external lock for every new table it uses
  we can use this to start the transactions.
  If we are in auto_commit mode we just need to start a transaction
  for the statement, this will be stored in transaction.stmt.
  If not, we have to start a master transaction if there doesn't exist
  one from before, this will be stored in transaction.all
 
  When a table lock is held one transaction will be started which holds
  the table lock and for each statement a hupp transaction will be started  
 */

int ha_ndbcluster::external_lock(THD *thd, int lock_type)
{
  int error=0;
  NdbConnection* trans= NULL;

  DBUG_ENTER("external_lock");
  /*
    Check that this handler instance has a connection
    set up to the Ndb object of thd
   */
  if (check_ndb_connection())
    DBUG_RETURN(1);
 
  Thd_ndb *thd_ndb= (Thd_ndb*)thd->transaction.thd_ndb;
  Ndb *ndb= thd_ndb->ndb;

  DBUG_PRINT("enter", ("transaction.thd_ndb->lock_count: %d", 
                       thd_ndb->lock_count));

  if (lock_type != F_UNLCK)
  {
    DBUG_PRINT("info", ("lock_type != F_UNLCK"));
    if (!thd_ndb->lock_count++)
    {
      PRINT_OPTION_FLAGS(thd);

      if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN | OPTION_TABLE_LOCK))) 
      {
        // Autocommit transaction
        DBUG_ASSERT(!thd->transaction.stmt.ndb_tid);
        DBUG_PRINT("trans",("Starting transaction stmt"));      

        trans= ndb->startTransaction();
        if (trans == NULL)
          ERR_RETURN(ndb->getNdbError());
	no_uncommitted_rows_reset(thd);
        thd->transaction.stmt.ndb_tid= trans;
      } 
      else 
      { 
        if (!thd->transaction.all.ndb_tid)
	{
          // Not autocommit transaction
          // A "master" transaction ha not been started yet
          DBUG_PRINT("trans",("starting transaction, all"));
          
          trans= ndb->startTransaction();
          if (trans == NULL)
            ERR_RETURN(ndb->getNdbError());
	  no_uncommitted_rows_reset(thd);

          /*
            If this is the start of a LOCK TABLE, a table look 
            should be taken on the table in NDB
           
            Check if it should be read or write lock
           */
          if (thd->options & (OPTION_TABLE_LOCK))
	  {
            //lockThisTable();
            DBUG_PRINT("info", ("Locking the table..." ));
          }

          thd->transaction.all.ndb_tid= trans; 
        }
      }
    }
    /*
      This is the place to make sure this handler instance
      has a started transaction.
     
      The transaction is started by the first handler on which 
      MySQL Server calls external lock
     
      Other handlers in the same stmt or transaction should use 
      the same NDB transaction. This is done by setting up the m_active_trans
      pointer to point to the NDB transaction. 
     */

    // store thread specific data first to set the right context
    m_force_send=          thd->variables.ndb_force_send;
    m_ha_not_exact_count= !thd->variables.ndb_use_exact_count;
    m_autoincrement_prefetch= thd->variables.ndb_autoincrement_prefetch_sz;
    if (!thd->transaction.on)
      m_transaction_on= FALSE;
    else
      m_transaction_on= thd->variables.ndb_use_transactions;

    m_active_trans= thd->transaction.all.ndb_tid ? 
      (NdbConnection*)thd->transaction.all.ndb_tid:
      (NdbConnection*)thd->transaction.stmt.ndb_tid;
    DBUG_ASSERT(m_active_trans);
    // Start of transaction
    m_retrieve_all_fields= FALSE;
    m_retrieve_primary_key= FALSE;
    m_ops_pending= 0;    
    {
      NDBDICT *dict= ndb->getDictionary();
      const NDBTAB *tab;
      void *tab_info;
      if (!(tab= dict->getTable(m_tabname, &tab_info)))
	ERR_RETURN(dict->getNdbError());
      DBUG_PRINT("info", ("Table schema version: %d", tab->getObjectVersion()));
      m_table= (void *)tab;
      m_table_info= tab_info;
    }
    no_uncommitted_rows_init(thd);
  } 
  else 
  {
    DBUG_PRINT("info", ("lock_type == F_UNLCK"));
    if (!--thd_ndb->lock_count)
    {
      DBUG_PRINT("trans", ("Last external_lock"));
      PRINT_OPTION_FLAGS(thd);

      if (thd->transaction.stmt.ndb_tid)
      {
        /*
          Unlock is done without a transaction commit / rollback.
          This happens if the thread didn't update any rows
          We must in this case close the transaction to release resources
        */
        DBUG_PRINT("trans",("ending non-updating transaction"));
        ndb->closeTransaction(m_active_trans);
        thd->transaction.stmt.ndb_tid= 0;
      }
    }
    m_table= NULL;
    m_table_info= NULL;
    /*
      This is the place to make sure this handler instance
      no longer are connected to the active transaction.

      And since the handler is no longer part of the transaction 
      it can't have open cursors, ops or blobs pending.
    */
    m_active_trans= NULL;    

    if (m_active_cursor)
      DBUG_PRINT("warning", ("m_active_cursor != NULL"));
    m_active_cursor= NULL;

    if (m_blobs_pending)
      DBUG_PRINT("warning", ("blobs_pending != 0"));
    m_blobs_pending= 0;
    
    if (m_ops_pending)
      DBUG_PRINT("warning", ("ops_pending != 0L"));
    m_ops_pending= 0;
  }
  DBUG_RETURN(error);
}

/*
  When using LOCK TABLE's external_lock is only called when the actual
  TABLE LOCK is done.
  Under LOCK TABLES, each used tables will force a call to start_stmt.
  Ndb doesn't currently support table locks, and will do ordinary
  startTransaction for each transaction/statement.
*/

int ha_ndbcluster::start_stmt(THD *thd)
{
  int error=0;
  DBUG_ENTER("start_stmt");
  PRINT_OPTION_FLAGS(thd);

  NdbConnection *trans= (NdbConnection*)thd->transaction.stmt.ndb_tid;
  if (!trans){
    Ndb *ndb= ((Thd_ndb*)thd->transaction.thd_ndb)->ndb;
    DBUG_PRINT("trans",("Starting transaction stmt"));  
    
    NdbConnection *tablock_trans= 
      (NdbConnection*)thd->transaction.all.ndb_tid;
    DBUG_PRINT("info", ("tablock_trans: %x", (uint)tablock_trans));
    DBUG_ASSERT(tablock_trans);
//    trans= ndb->hupp(tablock_trans);
    trans= ndb->startTransaction();
    if (trans == NULL)
      ERR_RETURN(ndb->getNdbError());
    no_uncommitted_rows_reset(thd);
    thd->transaction.stmt.ndb_tid= trans;
  }
  m_active_trans= trans;

  // Start of statement
  m_retrieve_all_fields= FALSE;
  m_retrieve_primary_key= FALSE;
  m_ops_pending= 0;    
  
  DBUG_RETURN(error);
}


/*
  Commit a transaction started in NDB 
 */

int ndbcluster_commit(THD *thd, void *ndb_transaction)
{
  int res= 0;
  Ndb *ndb= ((Thd_ndb*)thd->transaction.thd_ndb)->ndb;
  NdbConnection *trans= (NdbConnection*)ndb_transaction;

  DBUG_ENTER("ndbcluster_commit");
  DBUG_PRINT("transaction",("%s",
                            trans == thd->transaction.stmt.ndb_tid ? 
                            "stmt" : "all"));
  DBUG_ASSERT(ndb && trans);

  if (execute_commit(thd,trans) != 0)
  {
    const NdbError err= trans->getNdbError();
    const NdbOperation *error_op= trans->getNdbErrorOperation();
    ERR_PRINT(err);     
    res= ndb_to_mysql_error(&err);
    if (res != -1) 
      ndbcluster_print_error(res, error_op);
  }
  ndb->closeTransaction(trans);
  DBUG_RETURN(res);
}


/*
  Rollback a transaction started in NDB
 */

int ndbcluster_rollback(THD *thd, void *ndb_transaction)
{
  int res= 0;
  Ndb *ndb= ((Thd_ndb*)thd->transaction.thd_ndb)->ndb;
  NdbConnection *trans= (NdbConnection*)ndb_transaction;

  DBUG_ENTER("ndbcluster_rollback");
  DBUG_PRINT("transaction",("%s",
                            trans == thd->transaction.stmt.ndb_tid ? 
                            "stmt" : "all"));
  DBUG_ASSERT(ndb && trans);

  if (trans->execute(Rollback) != 0)
  {
    const NdbError err= trans->getNdbError();
    const NdbOperation *error_op= trans->getNdbErrorOperation();
    ERR_PRINT(err);     
    res= ndb_to_mysql_error(&err);
    if (res != -1) 
      ndbcluster_print_error(res, error_op);
  }
  ndb->closeTransaction(trans);
  DBUG_RETURN(0);
}


/*
  Define NDB column based on Field.
  Returns 0 or mysql error code.
  Not member of ha_ndbcluster because NDBCOL cannot be declared.
 */

static int create_ndb_column(NDBCOL &col,
                             Field *field,
                             HA_CREATE_INFO *info)
{
  // Set name
  {
    char truncated_field_name[NDB_MAX_ATTR_NAME_SIZE];
    strnmov(truncated_field_name,field->field_name,sizeof(truncated_field_name));
    truncated_field_name[sizeof(truncated_field_name)-1]= '\0';
    col.setName(truncated_field_name);
  }
  // Get char set
  CHARSET_INFO *cs= field->charset();
  // Set type and sizes
  const enum enum_field_types mysql_type= field->real_type();
  switch (mysql_type) {
  // Numeric types
  case MYSQL_TYPE_DECIMAL:    
    col.setType(NDBCOL::Char);
    col.setLength(field->pack_length());
    break;
  case MYSQL_TYPE_TINY:        
    if (field->flags & UNSIGNED_FLAG)
      col.setType(NDBCOL::Tinyunsigned);
    else
      col.setType(NDBCOL::Tinyint);
    col.setLength(1);
    break;
  case MYSQL_TYPE_SHORT:
    if (field->flags & UNSIGNED_FLAG)
      col.setType(NDBCOL::Smallunsigned);
    else
      col.setType(NDBCOL::Smallint);
    col.setLength(1);
    break;
  case MYSQL_TYPE_LONG:
    if (field->flags & UNSIGNED_FLAG)
      col.setType(NDBCOL::Unsigned);
    else
      col.setType(NDBCOL::Int);
    col.setLength(1);
    break;
  case MYSQL_TYPE_INT24:       
    if (field->flags & UNSIGNED_FLAG)
      col.setType(NDBCOL::Mediumunsigned);
    else
      col.setType(NDBCOL::Mediumint);
    col.setLength(1);
    break;
  case MYSQL_TYPE_LONGLONG:
    if (field->flags & UNSIGNED_FLAG)
      col.setType(NDBCOL::Bigunsigned);
    else
      col.setType(NDBCOL::Bigint);
    col.setLength(1);
    break;
  case MYSQL_TYPE_FLOAT:
    col.setType(NDBCOL::Float);
    col.setLength(1);
    break;
  case MYSQL_TYPE_DOUBLE:
    col.setType(NDBCOL::Double);
    col.setLength(1);
    break;
  // Date types
  case MYSQL_TYPE_TIMESTAMP:
    col.setType(NDBCOL::Unsigned);
    col.setLength(1);
    break;
  case MYSQL_TYPE_DATETIME:    
    col.setType(NDBCOL::Datetime);
    col.setLength(1);
    break;
  case MYSQL_TYPE_DATE:
  case MYSQL_TYPE_NEWDATE:
  case MYSQL_TYPE_TIME:        
  case MYSQL_TYPE_YEAR:        
    col.setType(NDBCOL::Char);
    col.setLength(field->pack_length());
    break;
  // Char types
  case MYSQL_TYPE_STRING:      
    if (field->flags & BINARY_FLAG)
      col.setType(NDBCOL::Binary);
    else {
      col.setType(NDBCOL::Char);
      col.setCharset(cs);
    }
    if (field->pack_length() == 0)
      col.setLength(1); // currently ndb does not support size 0
    else
      col.setLength(field->pack_length());
    break;
  case MYSQL_TYPE_VAR_STRING:
    if (field->flags & BINARY_FLAG)
      col.setType(NDBCOL::Varbinary);
    else {
      col.setType(NDBCOL::Varchar);
      col.setCharset(cs);
    }
    col.setLength(field->pack_length());
    break;
  // Blob types (all come in as MYSQL_TYPE_BLOB)
  mysql_type_tiny_blob:
  case MYSQL_TYPE_TINY_BLOB:
    if (field->flags & BINARY_FLAG)
      col.setType(NDBCOL::Blob);
    else {
      col.setType(NDBCOL::Text);
      col.setCharset(cs);
    }
    col.setInlineSize(256);
    // No parts
    col.setPartSize(0);
    col.setStripeSize(0);
    break;
  mysql_type_blob:
  case MYSQL_TYPE_BLOB:    
    if (field->flags & BINARY_FLAG)
      col.setType(NDBCOL::Blob);
    else {
      col.setType(NDBCOL::Text);
      col.setCharset(cs);
    }
    // Use "<=" even if "<" is the exact condition
    if (field->max_length() <= (1 << 8))
      goto mysql_type_tiny_blob;
    else if (field->max_length() <= (1 << 16))
    {
      col.setInlineSize(256);
      col.setPartSize(2000);
      col.setStripeSize(16);
    }
    else if (field->max_length() <= (1 << 24))
      goto mysql_type_medium_blob;
    else
      goto mysql_type_long_blob;
    break;
  mysql_type_medium_blob:
  case MYSQL_TYPE_MEDIUM_BLOB:   
    if (field->flags & BINARY_FLAG)
      col.setType(NDBCOL::Blob);
    else {
      col.setType(NDBCOL::Text);
      col.setCharset(cs);
    }
    col.setInlineSize(256);
    col.setPartSize(4000);
    col.setStripeSize(8);
    break;
  mysql_type_long_blob:
  case MYSQL_TYPE_LONG_BLOB:  
    if (field->flags & BINARY_FLAG)
      col.setType(NDBCOL::Blob);
    else {
      col.setType(NDBCOL::Text);
      col.setCharset(cs);
    }
    col.setInlineSize(256);
    col.setPartSize(8000);
    col.setStripeSize(4);
    break;
  // Other types
  case MYSQL_TYPE_ENUM:
    col.setType(NDBCOL::Char);
    col.setLength(field->pack_length());
    break;
  case MYSQL_TYPE_SET:         
    col.setType(NDBCOL::Char);
    col.setLength(field->pack_length());
    break;
  case MYSQL_TYPE_NULL:        
  case MYSQL_TYPE_GEOMETRY:
    goto mysql_type_unsupported;
  mysql_type_unsupported:
  default:
    return HA_ERR_UNSUPPORTED;
  }
  // Set nullable and pk
  col.setNullable(field->maybe_null());
  col.setPrimaryKey(field->flags & PRI_KEY_FLAG);
  // Set autoincrement
  if (field->flags & AUTO_INCREMENT_FLAG) 
  {
    col.setAutoIncrement(TRUE);
    ulonglong value= info->auto_increment_value ?
      info->auto_increment_value : (ulonglong) 1;
    DBUG_PRINT("info", ("Autoincrement key, initial: %llu", value));
    col.setAutoIncrementInitialValue(value);
  }
  else
    col.setAutoIncrement(FALSE);
  return 0;
}

/*
  Create a table in NDB Cluster
 */

int ha_ndbcluster::create(const char *name, 
			  TABLE *form, 
			  HA_CREATE_INFO *info)
{
  NDBTAB tab;
  NDBCOL col;
  uint pack_length, length, i, pk_length= 0;
  const void *data, *pack_data;
  const char **key_names= form->keynames.type_names;
  char name2[FN_HEADLEN];
  bool create_from_engine= (info->table_options & HA_CREATE_FROM_ENGINE);
   
  DBUG_ENTER("create");
  DBUG_PRINT("enter", ("name: %s", name));
  fn_format(name2, name, "", "",2);       // Remove the .frm extension
  set_dbname(name2);
  set_tabname(name2);    

  if (create_from_engine)
  {
    /*
      Table alreay exists in NDB and frm file has been created by 
      caller.
      Do Ndb specific stuff, such as create a .ndb file
    */
    my_errno= write_ndb_file();
    DBUG_RETURN(my_errno);
  }

  DBUG_PRINT("table", ("name: %s", m_tabname));  
  tab.setName(m_tabname);
  tab.setLogging(!(info->options & HA_LEX_CREATE_TMP_TABLE));    
   
  // Save frm data for this table
  if (readfrm(name, &data, &length))
    DBUG_RETURN(1);
  if (packfrm(data, length, &pack_data, &pack_length))
    DBUG_RETURN(2);
  
  DBUG_PRINT("info", ("setFrm data=%x, len=%d", pack_data, pack_length));
  tab.setFrm(pack_data, pack_length);      
  my_free((char*)data, MYF(0));
  my_free((char*)pack_data, MYF(0));
  
  for (i= 0; i < form->fields; i++) 
  {
    Field *field= form->field[i];
    DBUG_PRINT("info", ("name: %s, type: %u, pack_length: %d", 
                        field->field_name, field->real_type(),
			field->pack_length()));
    if ((my_errno= create_ndb_column(col, field, info)))
      DBUG_RETURN(my_errno);
    tab.addColumn(col);
    if(col.getPrimaryKey())
      pk_length += (field->pack_length() + 3) / 4;
  }
  
  // No primary key, create shadow key as 64 bit, auto increment  
  if (form->primary_key == MAX_KEY) 
  {
    DBUG_PRINT("info", ("Generating shadow key"));
    col.setName("$PK");
    col.setType(NdbDictionary::Column::Bigunsigned);
    col.setLength(1);
    col.setNullable(FALSE);
    col.setPrimaryKey(TRUE);
    col.setAutoIncrement(TRUE);
    tab.addColumn(col);
    pk_length += 2;
  }
  
  // Make sure that blob tables don't have to big part size
  for (i= 0; i < form->fields; i++) 
  {
    /**
     * The extra +7 concists
     * 2 - words from pk in blob table
     * 5 - from extra words added by tup/dict??
     */
    switch (form->field[i]->real_type()) {
    case MYSQL_TYPE_BLOB:    
    case MYSQL_TYPE_MEDIUM_BLOB:   
    case MYSQL_TYPE_LONG_BLOB: 
    {
      NdbDictionary::Column * col = tab.getColumn(i);
      int size = pk_length + (col->getPartSize()+3)/4 + 7;
      if(size > NDB_MAX_TUPLE_SIZE_IN_WORDS && 
	 (pk_length+7) < NDB_MAX_TUPLE_SIZE_IN_WORDS)
      {
	size = NDB_MAX_TUPLE_SIZE_IN_WORDS - pk_length - 7;
	col->setPartSize(4*size);
      }
      /**
       * If size > NDB_MAX and pk_length+7 >= NDB_MAX
       *   then the table can't be created anyway, so skip
       *   changing part size, and have error later
       */ 
    }
    default:
      break;
    }
  }
  
  if ((my_errno= check_ndb_connection()))
    DBUG_RETURN(my_errno);
  
  // Create the table in NDB     
  Ndb *ndb= get_ndb();
  NDBDICT *dict= ndb->getDictionary();
  if (dict->createTable(tab) != 0) 
  {
    const NdbError err= dict->getNdbError();
    ERR_PRINT(err);
    my_errno= ndb_to_mysql_error(&err);
    DBUG_RETURN(my_errno);
  }
  DBUG_PRINT("info", ("Table %s/%s created successfully", 
                      m_dbname, m_tabname));

  // Create secondary indexes
  my_errno= build_index_list(form, ILBP_CREATE);

  if (!my_errno)
    my_errno= write_ndb_file();

  DBUG_RETURN(my_errno);
}


int ha_ndbcluster::create_ordered_index(const char *name, 
					KEY *key_info)
{
  DBUG_ENTER("create_ordered_index");
  DBUG_RETURN(create_index(name, key_info, FALSE));
}

int ha_ndbcluster::create_unique_index(const char *name, 
				       KEY *key_info)
{

  DBUG_ENTER("create_unique_index");
  DBUG_RETURN(create_index(name, key_info, TRUE));
}


/*
  Create an index in NDB Cluster
 */

int ha_ndbcluster::create_index(const char *name, 
				KEY *key_info,
				bool unique)
{
  Ndb *ndb= get_ndb();
  NdbDictionary::Dictionary *dict= ndb->getDictionary();
  KEY_PART_INFO *key_part= key_info->key_part;
  KEY_PART_INFO *end= key_part + key_info->key_parts;
  
  DBUG_ENTER("create_index");
  DBUG_PRINT("enter", ("name: %s ", name));

  NdbDictionary::Index ndb_index(name);
  if (unique)
    ndb_index.setType(NdbDictionary::Index::UniqueHashIndex);
  else 
  {
    ndb_index.setType(NdbDictionary::Index::OrderedIndex);
    // TODO Only temporary ordered indexes supported
    ndb_index.setLogging(FALSE); 
  }
  ndb_index.setTable(m_tabname);

  for (; key_part != end; key_part++) 
  {
    Field *field= key_part->field;
    DBUG_PRINT("info", ("attr: %s", field->field_name));
    {
      char truncated_field_name[NDB_MAX_ATTR_NAME_SIZE];
      strnmov(truncated_field_name,field->field_name,sizeof(truncated_field_name));
      truncated_field_name[sizeof(truncated_field_name)-1]= '\0';
      ndb_index.addColumnName(truncated_field_name);
    }
  }
  
  if (dict->createIndex(ndb_index))
    ERR_RETURN(dict->getNdbError());

  // Success
  DBUG_PRINT("info", ("Created index %s", name));
  DBUG_RETURN(0);  
}


/*
  Rename a table in NDB Cluster
*/

int ha_ndbcluster::rename_table(const char *from, const char *to)
{
  NDBDICT *dict;
  char new_tabname[FN_HEADLEN];
  const NDBTAB *orig_tab;
  int result;

  DBUG_ENTER("ha_ndbcluster::rename_table");
  DBUG_PRINT("info", ("Renaming %s to %s", from, to));
  set_dbname(from);
  set_tabname(from);
  set_tabname(to, new_tabname);

  if (check_ndb_connection())
    DBUG_RETURN(my_errno= HA_ERR_NO_CONNECTION);
  
  Ndb *ndb= get_ndb();
  dict= ndb->getDictionary();
  if (!(orig_tab= dict->getTable(m_tabname)))
    ERR_RETURN(dict->getNdbError());

  m_table= (void *)orig_tab;
  // Change current database to that of target table
  set_dbname(to);
  ndb->setDatabaseName(m_dbname);
  if (!(result= alter_table_name(new_tabname)))
  {
    // Rename .ndb file
    result= handler::rename_table(from, to);
  }

  DBUG_RETURN(result);
}


/*
  Rename a table in NDB Cluster using alter table
 */

int ha_ndbcluster::alter_table_name(const char *to)
{
  Ndb *ndb= get_ndb();
  NDBDICT *dict= ndb->getDictionary();
  const NDBTAB *orig_tab= (const NDBTAB *) m_table;
  int ret;
  DBUG_ENTER("alter_table_name_table");

  NdbDictionary::Table new_tab= *orig_tab;
  new_tab.setName(to);
  if (dict->alterTable(new_tab) != 0)
    ERR_RETURN(dict->getNdbError());

  m_table= NULL;
  m_table_info= NULL;
                                                                             
  DBUG_RETURN(0);
}


/*
  Delete a table from NDB Cluster
 */

int ha_ndbcluster::delete_table(const char *name)
{
  DBUG_ENTER("delete_table");
  DBUG_PRINT("enter", ("name: %s", name));
  set_dbname(name);
  set_tabname(name);
  
  if (check_ndb_connection())
    DBUG_RETURN(HA_ERR_NO_CONNECTION);
  // Remove .ndb file
  handler::delete_table(name);
  DBUG_RETURN(drop_table());
}


/*
  Drop a table in NDB Cluster
 */

int ha_ndbcluster::drop_table()
{
  Ndb *ndb= get_ndb();
  NdbDictionary::Dictionary *dict= ndb->getDictionary();
  
  DBUG_ENTER("drop_table");
  DBUG_PRINT("enter", ("Deleting %s", m_tabname));
  
  if (dict->dropTable(m_tabname)) 
  {
    const NdbError err= dict->getNdbError();
    if (err.code == 709)
      ; // 709: No such table existed
    else 
      ERR_RETURN(dict->getNdbError());
  }  
  release_metadata();
  DBUG_RETURN(0);
}


/*
  Drop a database in NDB Cluster
 */

int ndbcluster_drop_database(const char *path)
{
  DBUG_ENTER("ndbcluster_drop_database");
  // TODO drop all tables for this database
  DBUG_RETURN(1);
}


longlong ha_ndbcluster::get_auto_increment()
{  
  DBUG_ENTER("get_auto_increment");
  DBUG_PRINT("enter", ("m_tabname: %s", m_tabname));
  Ndb *ndb= get_ndb();
  int cache_size= 
    (m_rows_to_insert - m_rows_inserted < m_autoincrement_prefetch) ?
    m_rows_to_insert - m_rows_inserted 
    : (m_rows_to_insert > m_autoincrement_prefetch) ? 
    m_rows_to_insert 
    : m_autoincrement_prefetch;
  Uint64 auto_value= 
    (m_skip_auto_increment) ? 
    ndb->readAutoIncrementValue((const NDBTAB *) m_table)
    : ndb->getAutoIncrementValue((const NDBTAB *) m_table, cache_size);
  DBUG_RETURN((longlong)auto_value);
}


/*
  Constructor for the NDB Cluster table handler 
 */

ha_ndbcluster::ha_ndbcluster(TABLE *table_arg):
  handler(table_arg),
  m_active_trans(NULL),
  m_active_cursor(NULL),
  m_table(NULL),
  m_table_info(NULL),
  m_table_flags(HA_REC_NOT_IN_SEQ |
		HA_NULL_IN_KEY |
		HA_AUTO_PART_KEY |
		HA_NO_PREFIX_CHAR_KEYS),
  m_share(0),
  m_use_write(FALSE),
  m_ignore_dup_key(FALSE),
  m_primary_key_update(FALSE),
  m_retrieve_all_fields(FALSE),
  m_retrieve_primary_key(FALSE),
  m_rows_to_insert(1),
  m_rows_inserted(0),
  m_bulk_insert_rows(1024),
  m_bulk_insert_not_flushed(FALSE),
  m_ops_pending(0),
  m_skip_auto_increment(TRUE),
  m_blobs_pending(0),
  m_blobs_buffer(0),
  m_blobs_buffer_size(0),
  m_dupkey((uint) -1),
  m_ha_not_exact_count(FALSE),
  m_force_send(TRUE),
  m_autoincrement_prefetch(32),
  m_transaction_on(TRUE)
{
  int i;
  
  DBUG_ENTER("ha_ndbcluster");

  m_tabname[0]= '\0';
  m_dbname[0]= '\0';

  records= ~(ha_rows)0; // uninitialized
  block_size= 1024;

  for (i= 0; i < MAX_KEY; i++)
  {
    m_index[i].type= UNDEFINED_INDEX;   
    m_index[i].unique_index= NULL;      
    m_index[i].index= NULL;      
  }

  DBUG_VOID_RETURN;
}


/*
  Destructor for NDB Cluster table handler
 */

ha_ndbcluster::~ha_ndbcluster() 
{
  DBUG_ENTER("~ha_ndbcluster");

  if (m_share)
    free_share(m_share);
  release_metadata();
  my_free(m_blobs_buffer, MYF(MY_ALLOW_ZERO_PTR));
  m_blobs_buffer= 0;

  // Check for open cursor/transaction
  if (m_active_cursor) {
  }
  DBUG_ASSERT(m_active_cursor == NULL);
  if (m_active_trans) {
  }
  DBUG_ASSERT(m_active_trans == NULL);

  DBUG_VOID_RETURN;
}


/*
  Open a table for further use
  - fetch metadata for this table from NDB
  - check that table exists
*/

int ha_ndbcluster::open(const char *name, int mode, uint test_if_locked)
{
  int res;
  KEY *key;
  DBUG_ENTER("open");
  DBUG_PRINT("enter", ("name: %s mode: %d test_if_locked: %d",
                       name, mode, test_if_locked));
  
  // Setup ref_length to make room for the whole 
  // primary key to be written in the ref variable
  
  if (table->primary_key != MAX_KEY) 
  {
    key= table->key_info+table->primary_key;
    ref_length= key->key_length;
    DBUG_PRINT("info", (" ref_length: %d", ref_length));
  }
  // Init table lock structure 
  if (!(m_share=get_share(name)))
    DBUG_RETURN(1);
  thr_lock_data_init(&m_share->lock,&m_lock,(void*) 0);
  
  set_dbname(name);
  set_tabname(name);
  
  if (check_ndb_connection()) {
    free_share(m_share); m_share= 0;
    DBUG_RETURN(HA_ERR_NO_CONNECTION);
  }
  
  res= get_metadata(name);
  if (!res)
    info(HA_STATUS_VARIABLE | HA_STATUS_CONST);

  DBUG_RETURN(res);
}


/*
  Close the table
  - release resources setup by open()
 */

int ha_ndbcluster::close(void)
{
  DBUG_ENTER("close");  
  free_share(m_share); m_share= 0;
  release_metadata();
  DBUG_RETURN(0);
}


Thd_ndb* ha_ndbcluster::seize_thd_ndb()
{
  Thd_ndb *thd_ndb;
  DBUG_ENTER("seize_thd_ndb");

  thd_ndb= new Thd_ndb();
  thd_ndb->ndb->getDictionary()->set_local_table_data_size(sizeof(Ndb_table_local_info));
  if (thd_ndb->ndb->init(max_transactions) != 0)
  {
    ERR_PRINT(thd_ndb->ndb->getNdbError());
    /*
      TODO 
      Alt.1 If init fails because to many allocated Ndb 
      wait on condition for a Ndb object to be released.
      Alt.2 Seize/release from pool, wait until next release 
    */
    delete thd_ndb;
    thd_ndb= NULL;
  }
  DBUG_RETURN(thd_ndb);
}


void ha_ndbcluster::release_thd_ndb(Thd_ndb* thd_ndb)
{
  DBUG_ENTER("release_thd_ndb");
  delete thd_ndb;
  DBUG_VOID_RETURN;
}


/*
  If this thread already has a Thd_ndb object allocated
  in current THD, reuse it. Otherwise
  seize a Thd_ndb object, assign it to current THD and use it.
 
*/

Ndb* check_ndb_in_thd(THD* thd)
{
  DBUG_ENTER("check_ndb_in_thd");
  Thd_ndb *thd_ndb= (Thd_ndb*)thd->transaction.thd_ndb;
  
  if (!thd_ndb)
  {
    if (!(thd_ndb= ha_ndbcluster::seize_thd_ndb()))
      DBUG_RETURN(NULL);
    thd->transaction.thd_ndb= thd_ndb;
  }
  DBUG_RETURN(thd_ndb->ndb);
}



int ha_ndbcluster::check_ndb_connection()
{
  THD* thd= current_thd;
  Ndb *ndb;
  DBUG_ENTER("check_ndb_connection");
  
  if (!(ndb= check_ndb_in_thd(thd)))
    DBUG_RETURN(HA_ERR_NO_CONNECTION);
  ndb->setDatabaseName(m_dbname);
  DBUG_RETURN(0);
}


void ndbcluster_close_connection(THD *thd)
{
  Thd_ndb *thd_ndb= (Thd_ndb*)thd->transaction.thd_ndb;
  DBUG_ENTER("ndbcluster_close_connection");
  if (thd_ndb)
  {
    ha_ndbcluster::release_thd_ndb(thd_ndb);
    thd->transaction.thd_ndb= NULL;
  }
  DBUG_VOID_RETURN;
}


/*
  Try to discover one table from NDB
 */

int ndbcluster_discover(THD* thd, const char *db, const char *name,
			const void** frmblob, uint* frmlen)
{
  uint len;
  const void* data;
  const NDBTAB* tab;
  Ndb* ndb;
  DBUG_ENTER("ndbcluster_discover");
  DBUG_PRINT("enter", ("db: %s, name: %s", db, name)); 

  if (!(ndb= check_ndb_in_thd(thd)))
    DBUG_RETURN(HA_ERR_NO_CONNECTION);  
  ndb->setDatabaseName(db);

  NDBDICT* dict= ndb->getDictionary();
  dict->set_local_table_data_size(sizeof(Ndb_table_local_info));
  dict->invalidateTable(name);
  if (!(tab= dict->getTable(name)))
  {    
    const NdbError err= dict->getNdbError();
    if (err.code == 709)
      DBUG_RETURN(1);
    ERR_RETURN(err);
  }
  
  DBUG_PRINT("info", ("Found table %s", tab->getName()));
  
  len= tab->getFrmLength();  
  if (len == 0 || tab->getFrmData() == NULL)
  {
    DBUG_PRINT("No frm data found",
               ("Table is probably created via NdbApi")); 
    DBUG_RETURN(2);
  }
  
  if (unpackfrm(&data, &len, tab->getFrmData()))
    DBUG_RETURN(3);

  *frmlen= len;
  *frmblob= data;
  
  DBUG_RETURN(0);
}

/*
  Check if a table exists in NDB
   
 */

int ndbcluster_table_exists(THD* thd, const char *db, const char *name)
{
  uint len;
  const void* data;
  const NDBTAB* tab;
  Ndb* ndb;
  DBUG_ENTER("ndbcluster_table_exists");
  DBUG_PRINT("enter", ("db: %s, name: %s", db, name)); 

  if (!(ndb= check_ndb_in_thd(thd)))
    DBUG_RETURN(HA_ERR_NO_CONNECTION);  
  ndb->setDatabaseName(db);

  NDBDICT* dict= ndb->getDictionary();
  dict->set_local_table_data_size(sizeof(Ndb_table_local_info));
  dict->invalidateTable(name);
  if (!(tab= dict->getTable(name)))
  {    
    const NdbError err= dict->getNdbError();
    if (err.code == 709)
      DBUG_RETURN(0);
    ERR_RETURN(err);
  }
  
  DBUG_PRINT("info", ("Found table %s", tab->getName()));
  DBUG_RETURN(1);
}



extern "C" byte* tables_get_key(const char *entry, uint *length,
				my_bool not_used __attribute__((unused)))
{
  *length= strlen(entry);
  return (byte*) entry;
}


int ndbcluster_find_files(THD *thd,const char *db,const char *path,
			  const char *wild, bool dir, List<char> *files)
{
  DBUG_ENTER("ndbcluster_find_files");
  DBUG_PRINT("enter", ("db: %s", db));
  { // extra bracket to avoid gcc 2.95.3 warning
  uint i;
  Ndb* ndb;
  char name[FN_REFLEN];
  HASH ndb_tables, ok_tables;
  NdbDictionary::Dictionary::List list;

  if (!(ndb= check_ndb_in_thd(thd)))
    DBUG_RETURN(HA_ERR_NO_CONNECTION);

  if (dir)
    DBUG_RETURN(0); // Discover of databases not yet supported

  // List tables in NDB
  NDBDICT *dict= ndb->getDictionary();
  if (dict->listObjects(list, 
			NdbDictionary::Object::UserTable) != 0)
    ERR_RETURN(dict->getNdbError());

  if (hash_init(&ndb_tables, system_charset_info,list.count,0,0,
		(hash_get_key)tables_get_key,0,0))
  {
    DBUG_PRINT("error", ("Failed to init HASH ndb_tables"));
    DBUG_RETURN(-1);
  }

  if (hash_init(&ok_tables, system_charset_info,32,0,0,
		(hash_get_key)tables_get_key,0,0))
  {
    DBUG_PRINT("error", ("Failed to init HASH ok_tables"));
    hash_free(&ndb_tables);
    DBUG_RETURN(-1);
  }  

  for (i= 0 ; i < list.count ; i++)
  {
    NdbDictionary::Dictionary::List::Element& t= list.elements[i];
    DBUG_PRINT("info", ("Found %s/%s in NDB", t.database, t.name));     

    // Add only tables that belongs to db
    if (my_strcasecmp(system_charset_info, t.database, db))
      continue;

    // Apply wildcard to list of tables in NDB
    if (wild)
    {
      if (lower_case_table_names)
      {
	if (wild_case_compare(files_charset_info, t.name, wild))
	  continue;
      }
      else if (wild_compare(t.name,wild,0))
	continue;
    }
    DBUG_PRINT("info", ("Inserting %s into ndb_tables hash", t.name));     
    my_hash_insert(&ndb_tables, (byte*)thd->strdup(t.name));
  }

  char *file_name;
  List_iterator<char> it(*files);
  List<char> delete_list;
  while ((file_name=it++))
  {
    DBUG_PRINT("info", ("%s", file_name));     
    if (hash_search(&ndb_tables, file_name, strlen(file_name)))
    {
      DBUG_PRINT("info", ("%s existed in NDB _and_ on disk ", file_name));
      // File existed in NDB and as frm file, put in ok_tables list
      my_hash_insert(&ok_tables, (byte*)file_name);
      continue;
    }
    
    // File is not in NDB, check for .ndb file with this name
    (void)strxnmov(name, FN_REFLEN, 
		   mysql_data_home,"/",db,"/",file_name,ha_ndb_ext,NullS);
    DBUG_PRINT("info", ("Check access for %s", name));
    if (access(name, F_OK))
    {
      DBUG_PRINT("info", ("%s did not exist on disk", name));     
      // .ndb file did not exist on disk, another table type
      continue;
    }

    DBUG_PRINT("info", ("%s existed on disk", name));     
    // The .ndb file exists on disk, but it's not in list of tables in ndb
    // Verify that handler agrees table is gone.
    if (ndbcluster_table_exists(thd, db, file_name) == 0)    
    {
      DBUG_PRINT("info", ("NDB says %s does not exists", file_name));     
      it.remove();
      // Put in list of tables to remove from disk
      delete_list.push_back(thd->strdup(file_name));
    }
  }

  // Check for new files to discover
  DBUG_PRINT("info", ("Checking for new files to discover"));       
  List<char> create_list;
  for (i= 0 ; i < ndb_tables.records ; i++)
  {
    file_name= hash_element(&ndb_tables, i);
    if (!hash_search(&ok_tables, file_name, strlen(file_name)))
    {
      DBUG_PRINT("info", ("%s must be discovered", file_name));       
      // File is in list of ndb tables and not in ok_tables
      // This table need to be created
      create_list.push_back(thd->strdup(file_name));
    }
  }

  // Lock mutex before deleting and creating frm files
  pthread_mutex_lock(&LOCK_open);

  if (!global_read_lock)
  {
    // Delete old files
    List_iterator_fast<char> it3(delete_list);
    while ((file_name=it3++))
    {  
      DBUG_PRINT("info", ("Remove table %s/%s",db, file_name ));
      // Delete the table and all related files
      TABLE_LIST table_list;
      bzero((char*) &table_list,sizeof(table_list));
      table_list.db= (char*) db;
      table_list.alias=table_list.real_name=(char*)file_name;
      (void)mysql_rm_table_part2(thd, &table_list, 
				 /* if_exists */ TRUE, 
				 /* drop_temporary */ FALSE, 
				 /* dont_log_query*/ TRUE);
    }
  }

  // Create new files
  List_iterator_fast<char> it2(create_list);
  while ((file_name=it2++))
  {  
    DBUG_PRINT("info", ("Table %s need discovery", name));
    if (ha_create_table_from_engine(thd, db, file_name, TRUE) == 0)
      files->push_back(thd->strdup(file_name)); 
  }

  pthread_mutex_unlock(&LOCK_open);      
  
  hash_free(&ok_tables);
  hash_free(&ndb_tables);
  } // extra bracket to avoid gcc 2.95.3 warning
  DBUG_RETURN(0);    
}


/*
  Initialise all gloal variables before creating 
  a NDB Cluster table handler
 */

bool ndbcluster_init()
{
  int res;
  DBUG_ENTER("ndbcluster_init");
  // Set connectstring if specified
  if (opt_ndbcluster_connectstring != 0)
    DBUG_PRINT("connectstring", ("%s", opt_ndbcluster_connectstring));     
  if ((g_ndb_cluster_connection=
       new Ndb_cluster_connection(opt_ndbcluster_connectstring)) == 0)
  {
    DBUG_PRINT("error",("Ndb_cluster_connection(%s)",
			opt_ndbcluster_connectstring));
    goto ndbcluster_init_error;
  }

  g_ndb_cluster_connection->set_optimized_node_selection
    (opt_ndb_optimized_node_selection);

  // Create a Ndb object to open the connection  to NDB
  g_ndb= new Ndb(g_ndb_cluster_connection, "sys");
  g_ndb->getDictionary()->set_local_table_data_size(sizeof(Ndb_table_local_info));
  if (g_ndb->init() != 0)
  {
    ERR_PRINT (g_ndb->getNdbError());
    goto ndbcluster_init_error;
  }

  if ((res= g_ndb_cluster_connection->connect(0,0,0)) == 0)
  {
    DBUG_PRINT("info",("NDBCLUSTER storage engine at %s on port %d",
		       g_ndb_cluster_connection->get_connected_host(),
		       g_ndb_cluster_connection->get_connected_port()));
    g_ndb_cluster_connection->wait_until_ready(10,0);
  } 
  else if(res == 1)
  {
    if (g_ndb_cluster_connection->start_connect_thread()) {
      DBUG_PRINT("error", ("g_ndb_cluster_connection->start_connect_thread()"));
      goto ndbcluster_init_error;
    }
    {
      char buf[1024];
      DBUG_PRINT("info",("NDBCLUSTER storage engine not started, will connect using %s",
			 g_ndb_cluster_connection->get_connectstring(buf,sizeof(buf))));
    }
  }
  else
  {
    DBUG_ASSERT(res == -1);
    DBUG_PRINT("error", ("permanent error"));
    goto ndbcluster_init_error;
  }
  
  (void) hash_init(&ndbcluster_open_tables,system_charset_info,32,0,0,
                   (hash_get_key) ndbcluster_get_key,0,0);
  pthread_mutex_init(&ndbcluster_mutex,MY_MUTEX_INIT_FAST);

  ndbcluster_inited= 1;
#ifdef USE_DISCOVER_ON_STARTUP
  if (ndb_discover_tables() != 0)
    goto ndbcluster_init_error;    
#endif
  DBUG_RETURN(FALSE);
 ndbcluster_init_error:
  ndbcluster_end();
  DBUG_RETURN(TRUE);
}


/*
  End use of the NDB Cluster table handler
  - free all global variables allocated by 
    ndcluster_init()
*/

bool ndbcluster_end()
{
  DBUG_ENTER("ndbcluster_end");
  if(g_ndb)
    delete g_ndb;
  g_ndb= NULL;
  if (g_ndb_cluster_connection)
    delete g_ndb_cluster_connection;
  g_ndb_cluster_connection= NULL;
  if (!ndbcluster_inited)
    DBUG_RETURN(0);
  hash_free(&ndbcluster_open_tables);
  pthread_mutex_destroy(&ndbcluster_mutex);
  ndbcluster_inited= 0;
  DBUG_RETURN(0);
}

/*
  Static error print function called from
  static handler method ndbcluster_commit
  and ndbcluster_rollback
*/

void ndbcluster_print_error(int error, const NdbOperation *error_op)
{
  DBUG_ENTER("ndbcluster_print_error");
  TABLE tab;
  const char *tab_name= (error_op) ? error_op->getTableName() : "";
  tab.table_name= (char *) tab_name;
  ha_ndbcluster error_handler(&tab);
  tab.file= &error_handler;
  error_handler.print_error(error, MYF(0));
  DBUG_VOID_RETURN;
}

/*
  Set m_tabname from full pathname to table file 
 */

void ha_ndbcluster::set_tabname(const char *path_name)
{
  char *end, *ptr;
  
  /* Scan name from the end */
  end= strend(path_name)-1;
  ptr= end;
  while (ptr >= path_name && *ptr != '\\' && *ptr != '/') {
    ptr--;
  }
  uint name_len= end - ptr;
  memcpy(m_tabname, ptr + 1, end - ptr);
  m_tabname[name_len]= '\0';
#ifdef __WIN__
  /* Put to lower case */
  ptr= m_tabname;
  
  while (*ptr != '\0') {
    *ptr= tolower(*ptr);
    ptr++;
  }
#endif
}

/**
 * Set a given location from full pathname to table file
 *
 */
void
ha_ndbcluster::set_tabname(const char *path_name, char * tabname)
{
  char *end, *ptr;
  
  /* Scan name from the end */
  end= strend(path_name)-1;
  ptr= end;
  while (ptr >= path_name && *ptr != '\\' && *ptr != '/') {
    ptr--;
  }
  uint name_len= end - ptr;
  memcpy(tabname, ptr + 1, end - ptr);
  tabname[name_len]= '\0';
#ifdef __WIN__
  /* Put to lower case */
  ptr= tabname;
  
  while (*ptr != '\0') {
    *ptr= tolower(*ptr);
    ptr++;
  }
#endif
}


/*
  Set m_dbname from full pathname to table file
 
 */

void ha_ndbcluster::set_dbname(const char *path_name)
{
  char *end, *ptr;
  
  /* Scan name from the end */
  ptr= strend(path_name)-1;
  while (ptr >= path_name && *ptr != '\\' && *ptr != '/') {
    ptr--;
  }
  ptr--;
  end= ptr;
  while (ptr >= path_name && *ptr != '\\' && *ptr != '/') {
    ptr--;
  }
  uint name_len= end - ptr;
  memcpy(m_dbname, ptr + 1, name_len);
  m_dbname[name_len]= '\0';
#ifdef __WIN__
  /* Put to lower case */
  
  ptr= m_dbname;
  
  while (*ptr != '\0') {
    *ptr= tolower(*ptr);
    ptr++;
  }
#endif
}


ha_rows 
ha_ndbcluster::records_in_range(uint inx, key_range *min_key,
                                key_range *max_key)
{
  KEY *key_info= table->key_info + inx;
  uint key_length= key_info->key_length;
  NDB_INDEX_TYPE idx_type= get_index_type(inx);  

  DBUG_ENTER("records_in_range");
  // Prevent partial read of hash indexes by returning HA_POS_ERROR
  if ((idx_type == UNIQUE_INDEX || idx_type == PRIMARY_KEY_INDEX) &&
      ((min_key && min_key->length < key_length) ||
       (max_key && max_key->length < key_length)))
    DBUG_RETURN(HA_POS_ERROR);
  
  // Read from hash index with full key
  // This is a "const" table which returns only one record!      
  if ((idx_type != ORDERED_INDEX) &&
      ((min_key && min_key->length == key_length) || 
       (max_key && max_key->length == key_length)))
    DBUG_RETURN(1);
  
  DBUG_RETURN(10); /* Good guess when you don't know anything */
}

ulong ha_ndbcluster::table_flags(void) const
{
  if (m_ha_not_exact_count)
    return m_table_flags | HA_NOT_EXACT_COUNT;
  else
    return m_table_flags;
}
const char * ha_ndbcluster::table_type() const 
{
  return("ndbcluster");
}
uint ha_ndbcluster::max_supported_record_length() const
{ 
  return NDB_MAX_TUPLE_SIZE;
}
uint ha_ndbcluster::max_supported_keys() const
{
  return MAX_KEY;
}
uint ha_ndbcluster::max_supported_key_parts() const 
{
  return NDB_MAX_NO_OF_ATTRIBUTES_IN_KEY;
}
uint ha_ndbcluster::max_supported_key_length() const
{
  return NDB_MAX_KEY_SIZE;
}
bool ha_ndbcluster::low_byte_first() const
{ 
#ifdef WORDS_BIGENDIAN
  return FALSE;
#else
  return TRUE;
#endif
}
bool ha_ndbcluster::has_transactions()
{
  return m_transaction_on;
}
const char* ha_ndbcluster::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:
  default:
    return "HASH";
  }
}
uint8 ha_ndbcluster::table_cache_type()
{
  DBUG_ENTER("ha_ndbcluster::table_cache_type=HA_CACHE_TBL_ASKTRANSACT");
  DBUG_RETURN(HA_CACHE_TBL_ASKTRANSACT);
}

static
my_bool
ndbcluster_cache_retrieval_allowed(
/*======================================*/
				/* out: TRUE if permitted, FALSE if not;
				note that the value FALSE means invalidation
				of query cache if *engine_data is changed */
	THD*	thd,		/* in: thd of the user who is trying to
				store a result to the query cache or
				retrieve it */
	char*	full_name,	/* in: concatenation of database name,
				the null character '\0', and the table
				name */
	uint	full_name_len,	/* in: length of the full name, i.e.
				len(dbname) + len(tablename) + 1 */
        ulonglong *engine_data) /* in: value set in call to 
				ha_ndbcluster::cached_table_registration
				   out: if return FALSE this is used to invalidate 
				all cached queries with this table*/
{
  DBUG_ENTER("ndbcluster_cache_retrieval_allowed");
  char tabname[128];
  char *dbname= full_name;
  my_bool is_autocommit;
  {
    int dbname_len= strlen(full_name);
    int tabname_len= full_name_len-dbname_len-1;
    memcpy(tabname, full_name+dbname_len+1, tabname_len);
    tabname[tabname_len]= '\0';
  }
  if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
    is_autocommit = FALSE;
  else
    is_autocommit = TRUE;
  DBUG_PRINT("enter",("dbname=%s, tabname=%s, autocommit=%d",
		      dbname,tabname,is_autocommit));
  if (!is_autocommit)
  {
    DBUG_PRINT("info",("OPTION_NOT_AUTOCOMMIT=%d OPTION_BEGIN=%d",
		       thd->options & OPTION_NOT_AUTOCOMMIT,
		       thd->options & OPTION_BEGIN));
    // ToDo enable cache inside a transaction
    // no need to invalidate though so leave *engine_data
    DBUG_RETURN(FALSE);
  }
  {
    Ndb *ndb;
    Uint64 commit_count;
    if (!(ndb= check_ndb_in_thd(thd)))
    {
      *engine_data= *engine_data+1; // invalidate
      DBUG_RETURN(FALSE);
    }
    ndb->setDatabaseName(dbname);
    if (ndb_get_table_statistics(ndb, tabname, 0, &commit_count))
    {
      *engine_data= *engine_data+1; // invalidate
      DBUG_RETURN(FALSE);
    }
    if (*engine_data != commit_count)
    {
      *engine_data= commit_count; // invalidate
      DBUG_RETURN(FALSE);
    }
  }
  DBUG_PRINT("exit",("*engine_data=%d ok, use cache",*engine_data));
  DBUG_RETURN(TRUE);
}

my_bool
ha_ndbcluster::cached_table_registration(
/*======================================*/
				/* out: TRUE if permitted, FALSE if not;
				note that the value FALSE means invalidation
				of query cache if *engine_data is changed */
	THD*	thd,		/* in: thd of the user who is trying to
				store a result to the query cache or
				retrieve it */
	char*	full_name,	/* in: concatenation of database name,
				the null character '\0', and the table
				name */
	uint	full_name_len,	/* in: length of the full name, i.e.
				len(dbname) + len(tablename) + 1 */
	qc_engine_callback 
	*engine_callback,       /* out: function to be called before using
				   cache on this table */
        ulonglong *engine_data) /* out: if return FALSE this is used to 
				   invalidate all cached queries with this table*/
{
  DBUG_ENTER("ha_ndbcluster::cached_table_registration");
  my_bool is_autocommit;
  if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
    is_autocommit = FALSE;
  else
    is_autocommit = TRUE;
  DBUG_PRINT("enter",("dbname=%s, tabname=%s, is_autocommit=%d",
		      m_dbname,m_tabname,is_autocommit));
  if (!is_autocommit)
  {
    DBUG_PRINT("info",("OPTION_NOT_AUTOCOMMIT=%d OPTION_BEGIN=%d",
		       thd->options & OPTION_NOT_AUTOCOMMIT,
		       thd->options & OPTION_BEGIN));
    // ToDo enable cache inside a transaction
    // no need to invalidate though so leave *engine_data
    DBUG_RETURN(FALSE);
  }
  {
    Uint64 commit_count;
    Ndb *ndb= get_ndb();
    ndb->setDatabaseName(m_dbname);
    if (ndb_get_table_statistics(ndb, m_tabname, 0, &commit_count))
    {
      *engine_data= 0;
      DBUG_RETURN(FALSE);
    }
    *engine_data= commit_count;
  }
  *engine_callback= ndbcluster_cache_retrieval_allowed;
  DBUG_PRINT("exit",("*engine_data=%d", *engine_data));
  DBUG_RETURN(TRUE);
}

/*
  Handling the shared NDB_SHARE structure that is needed to 
  provide table locking.
  It's also used for sharing data with other NDB handlers
  in the same MySQL Server. There is currently not much
  data we want to or can share.
 */

static byte* ndbcluster_get_key(NDB_SHARE *share,uint *length,
				my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
  return (byte*) share->table_name;
}

static NDB_SHARE* get_share(const char *table_name)
{
  NDB_SHARE *share;
  pthread_mutex_lock(&ndbcluster_mutex);
  uint length=(uint) strlen(table_name);
  if (!(share=(NDB_SHARE*) hash_search(&ndbcluster_open_tables,
                                       (byte*) table_name,
                                       length)))
  {
    if ((share=(NDB_SHARE *) my_malloc(sizeof(*share)+length+1,
                                       MYF(MY_WME | MY_ZEROFILL))))
    {
      share->table_name_length=length;
      share->table_name=(char*) (share+1);
      strmov(share->table_name,table_name);
      if (my_hash_insert(&ndbcluster_open_tables, (byte*) share))
      {
        pthread_mutex_unlock(&ndbcluster_mutex);
        my_free((gptr) share,0);
        return 0;
      }
      thr_lock_init(&share->lock);
      pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);
    }
  }
  share->use_count++;
  pthread_mutex_unlock(&ndbcluster_mutex);
  return share;
}


static void free_share(NDB_SHARE *share)
{
  pthread_mutex_lock(&ndbcluster_mutex);
  if (!--share->use_count)
  {
    hash_delete(&ndbcluster_open_tables, (byte*) share);
    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
  pthread_mutex_unlock(&ndbcluster_mutex);
}



/*
  Internal representation of the frm blob
   
*/

struct frm_blob_struct 
{
  struct frm_blob_header 
  {
    uint ver;      // Version of header
    uint orglen;   // Original length of compressed data
    uint complen;  // Compressed length of data, 0=uncompressed
  } head;
  char data[1];  
};



static int packfrm(const void *data, uint len, 
		   const void **pack_data, uint *pack_len)
{
  int error;
  ulong org_len, comp_len;
  uint blob_len;
  frm_blob_struct* blob;
  DBUG_ENTER("packfrm");
  DBUG_PRINT("enter", ("data: %x, len: %d", data, len));
  
  error= 1;
  org_len= len;
  if (my_compress((byte*)data, &org_len, &comp_len))
    goto err;
  
  DBUG_PRINT("info", ("org_len: %d, comp_len: %d", org_len, comp_len));
  DBUG_DUMP("compressed", (char*)data, org_len);
  
  error= 2;
  blob_len= sizeof(frm_blob_struct::frm_blob_header)+org_len;
  if (!(blob= (frm_blob_struct*) my_malloc(blob_len,MYF(MY_WME))))
    goto err;
  
  // Store compressed blob in machine independent format
  int4store((char*)(&blob->head.ver), 1);
  int4store((char*)(&blob->head.orglen), comp_len);
  int4store((char*)(&blob->head.complen), org_len);
  
  // Copy frm data into blob, already in machine independent format
  memcpy(blob->data, data, org_len);  
  
  *pack_data= blob;
  *pack_len= blob_len;
  error= 0;
  
  DBUG_PRINT("exit", ("pack_data: %x, pack_len: %d", *pack_data, *pack_len));
err:
  DBUG_RETURN(error);
  
}


static int unpackfrm(const void **unpack_data, uint *unpack_len,
		    const void *pack_data)
{
   const frm_blob_struct *blob= (frm_blob_struct*)pack_data;
   byte *data;
   ulong complen, orglen, ver;
   DBUG_ENTER("unpackfrm");
   DBUG_PRINT("enter", ("pack_data: %x", pack_data));

   complen=	uint4korr((char*)&blob->head.complen);
   orglen=	uint4korr((char*)&blob->head.orglen);
   ver=		uint4korr((char*)&blob->head.ver);
 
   DBUG_PRINT("blob",("ver: %d complen: %d orglen: %d",
 		     ver,complen,orglen));
   DBUG_DUMP("blob->data", (char*) blob->data, complen);
 
   if (ver != 1)
     DBUG_RETURN(1);
   if (!(data= my_malloc(max(orglen, complen), MYF(MY_WME))))
     DBUG_RETURN(2);
   memcpy(data, blob->data, complen);
 
   if (my_uncompress(data, &complen, &orglen))
   {
     my_free((char*)data, MYF(0));
     DBUG_RETURN(3);
   }

   *unpack_data= data;
   *unpack_len= complen;

   DBUG_PRINT("exit", ("frmdata: %x, len: %d", *unpack_data, *unpack_len));

   DBUG_RETURN(0);
}

static 
int
ndb_get_table_statistics(Ndb* ndb, const char * table, 
			 Uint64* row_count, Uint64* commit_count)
{
  DBUG_ENTER("ndb_get_table_statistics");
  DBUG_PRINT("enter", ("table: %s", table));
  NdbConnection* pTrans= ndb->startTransaction();
  do 
  {
    if (pTrans == NULL)
      break;
      
    NdbScanOperation* pOp= pTrans->getNdbScanOperation(table);
    if (pOp == NULL)
      break;
    
    NdbResultSet* rs= pOp->readTuples(NdbOperation::LM_CommittedRead); 
    if (rs == 0)
      break;
    
    int check= pOp->interpret_exit_last_row();
    if (check == -1)
      break;
    
    Uint64 rows, commits;
    pOp->getValue(NdbDictionary::Column::ROW_COUNT, (char*)&rows);
    pOp->getValue(NdbDictionary::Column::COMMIT_COUNT, (char*)&commits);
    
    check= pTrans->execute(NoCommit, AbortOnError, TRUE);
    if (check == -1)
      break;
    
    Uint64 sum_rows= 0;
    Uint64 sum_commits= 0;
    while((check= rs->nextResult(TRUE, TRUE)) == 0)
    {
      sum_rows+= rows;
      sum_commits+= commits;
    }
    
    if (check == -1)
      break;

    rs->close(TRUE);

    ndb->closeTransaction(pTrans);
    if(row_count)
      * row_count= sum_rows;
    if(commit_count)
      * commit_count= sum_commits;
    DBUG_PRINT("exit", ("records: %u commits: %u", sum_rows, sum_commits));
    DBUG_RETURN(0);
  } while(0);

  ndb->closeTransaction(pTrans);
  DBUG_PRINT("exit", ("failed"));
  DBUG_RETURN(-1);
}

/*
  Create a .ndb file to serve as a placeholder indicating 
  that the table with this name is a ndb table
*/

int ha_ndbcluster::write_ndb_file()
{
  File file;
  bool error=1;
  char path[FN_REFLEN];
  
  DBUG_ENTER("write_ndb_file");
  DBUG_PRINT("enter", ("db: %s, name: %s", m_dbname, m_tabname));

  (void)strxnmov(path, FN_REFLEN, 
		 mysql_data_home,"/",m_dbname,"/",m_tabname,ha_ndb_ext,NullS);

  if ((file=my_create(path, CREATE_MODE,O_RDWR | O_TRUNC,MYF(MY_WME))) >= 0)
  {
    // It's an empty file
    error=0;
    my_close(file,MYF(0));
  }
  DBUG_RETURN(error);
}

#endif /* HAVE_NDBCLUSTER_DB */