/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult 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 */


/* drop and alter of tables */

#include "mysql_priv.h"
#include <hash.h>
#include <myisam.h>

#ifdef __WIN__
#include <io.h>
#endif

extern HASH open_cache;

static bool check_if_keyname_exists(const char *name,KEY *start, KEY *end);
static char *make_unique_key_name(const char *field_name,KEY *start,KEY *end);
static int copy_data_between_tables(TABLE *from,TABLE *to,
				    List<create_field> &create,
				    enum enum_duplicates handle_duplicates,
                                    ORDER *order,
				    ha_rows *copied,ha_rows *deleted);

/*****************************************************************************
** Remove all possbile tables and give a compact errormessage for all
** wrong tables.
** This will wait for all users to free the table before dropping it
*****************************************************************************/

int mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists)
{
  char	path[FN_REFLEN];
  String wrong_tables;
  bool some_tables_deleted=0;
  uint error;
  db_type table_type;
  TABLE_LIST *table;
  DBUG_ENTER("mysql_rm_table");

  /* mark for close and remove all cached entries */

  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->mysys_var->current_mutex= &LOCK_open;
  thd->mysys_var->current_cond= &COND_refresh;
  VOID(pthread_mutex_lock(&LOCK_open));
  pthread_mutex_unlock(&thd->mysys_var->mutex);

  if(global_read_lock)
  {
    if(thd->global_read_lock)
    {
      my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE,MYF(0),
	       tables->real_name);
      error = 1;
      goto err;
    }
    while (global_read_lock && ! thd->killed)
    {
      (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
    }

  }
  
  for (table=tables ; table ; table=table->next)
  {
    char *db=table->db ? table->db : thd->db;
    if (!close_temporary_table(thd, db, table->real_name))
    {
      some_tables_deleted=1;			// Log query
      continue;					// removed temporary table
    }

    abort_locked_tables(thd,db,table->real_name);
    while (remove_table_from_cache(thd,db,table->real_name) && !thd->killed)
    {
      dropping_tables++;
      (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
      dropping_tables--;
    }
    drop_locked_tables(thd,db,table->real_name);
    if (thd->killed)
    {
      VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
      VOID(pthread_mutex_unlock(&LOCK_open));
      pthread_mutex_lock(&thd->mysys_var->mutex);
      thd->mysys_var->current_mutex= 0;
      thd->mysys_var->current_cond= 0;
      pthread_mutex_unlock(&thd->mysys_var->mutex);
      DBUG_RETURN(-1);
    }
    /* remove form file and isam files */
    (void) sprintf(path,"%s/%s/%s%s",mysql_data_home,db,table->real_name,
		   reg_ext);
    (void) unpack_filename(path,path);
    error=0;

    table_type=get_table_type(path);

    if (my_delete(path,MYF(0)))    /* Delete the table definition file */
    {
      if (errno != ENOENT || !if_exists)
      {
	error=1;
	if (errno != ENOENT)
	{
	  my_error(ER_CANT_DELETE_FILE,MYF(0),path,errno);
	}
      }
    }
    else
    {
      some_tables_deleted=1;
      *fn_ext(path)=0;				// Remove extension;
      error=ha_delete_table(table_type, path);
      if (error == ENOENT && if_exists)
	error = 0;
    }
    if (error)
    {
      if (wrong_tables.length())
	wrong_tables.append(',');
      wrong_tables.append(String(table->real_name));
    }
  }
  if (some_tables_deleted)
  {
    mysql_update_log.write(thd, thd->query,thd->query_length);
    if (mysql_bin_log.is_open())
    {
      Query_log_event qinfo(thd, thd->query);
      mysql_bin_log.write(&qinfo);
    }
  }
  
  error = 0;
 err:  
  VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
  pthread_mutex_unlock(&LOCK_open);

  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond= 0;
  pthread_mutex_unlock(&thd->mysys_var->mutex);

  if (wrong_tables.length())
  {
    my_error(ER_BAD_TABLE_ERROR,MYF(0),wrong_tables.c_ptr());
    error=1;
  }
  if(error)
    DBUG_RETURN(-1);
  send_ok(&thd->net);
  DBUG_RETURN(0);
}


int quick_rm_table(enum db_type base,const char *db,
		   const char *table_name)
{
  char path[FN_REFLEN];
  int error=0;
  (void) sprintf(path,"%s/%s/%s%s",mysql_data_home,db,table_name,reg_ext);
  unpack_filename(path,path);
  if (my_delete(path,MYF(0)))
    error=1; /* purecov: inspected */
  sprintf(path,"%s/%s/%s",mysql_data_home,db,table_name);
  return ha_delete_table(base,path) || error;
}

/*****************************************************************************
 * Create at table.
 * If one creates a temporary table, this is automaticly opened
 ****************************************************************************/

int mysql_create_table(THD *thd,const char *db, const char *table_name,
		       HA_CREATE_INFO *create_info,
		       List<create_field> &fields,
		       List<Key> &keys,bool tmp_table,bool no_log)
{
  char		path[FN_REFLEN];
  const char	*key_name;
  create_field	*sql_field,*dup_field;
  int		error= -1;
  uint		db_options,field,null_fields,blob_columns;
  ulong		pos;
  KEY	*key_info,*key_info_buffer;
  KEY_PART_INFO *key_part_info;
  int		auto_increment=0;
  handler	*file;
  DBUG_ENTER("mysql_create_table");

  /*
  ** Check for duplicate fields and check type of table to create
  */

  if (!fields.elements)
  {
    my_error(ER_TABLE_MUST_HAVE_COLUMNS,MYF(0));
    DBUG_RETURN(-1);
  }
  List_iterator<create_field> it(fields),it2(fields);
  null_fields=blob_columns=0;
  db_options=create_info->table_options;
  if (create_info->row_type == ROW_TYPE_DYNAMIC)
    db_options|=HA_OPTION_PACK_RECORD;
  file=get_new_handler((TABLE*) 0, create_info->db_type);

  /* Don't pack keys in old tables if the user has requested this */

  while ((sql_field=it++))
  {
    if ((sql_field->flags & BLOB_FLAG) ||
	sql_field->sql_type == FIELD_TYPE_VAR_STRING &&
	create_info->row_type != ROW_TYPE_FIXED)
    {
      db_options|=HA_OPTION_PACK_RECORD;
    }
    if (!(sql_field->flags & NOT_NULL_FLAG))
      null_fields++;
    while ((dup_field=it2++) != sql_field)
    {
      if (my_strcasecmp(sql_field->field_name, dup_field->field_name) == 0)
      {
	my_error(ER_DUP_FIELDNAME,MYF(0),sql_field->field_name);
	DBUG_RETURN(-1);
      }
    }
    it2.rewind();
  }
  /* If fixed row records, we need on bit to check for deleted rows */
  if (!(db_options & HA_OPTION_PACK_RECORD))
    null_fields++;
  pos=(null_fields+7)/8;

  it.rewind();
  while ((sql_field=it++))
  {
    switch (sql_field->sql_type) {
    case FIELD_TYPE_BLOB:
    case FIELD_TYPE_MEDIUM_BLOB:
    case FIELD_TYPE_TINY_BLOB:
    case FIELD_TYPE_LONG_BLOB:
      sql_field->pack_flag=FIELDFLAG_BLOB |
	pack_length_to_packflag(sql_field->pack_length -
				portable_sizeof_char_ptr);
      if (sql_field->flags & BINARY_FLAG)
	sql_field->pack_flag|=FIELDFLAG_BINARY;
      sql_field->length=8;			// Unireg field length
      sql_field->unireg_check=Field::BLOB_FIELD;
      blob_columns++;
      break;
    case FIELD_TYPE_VAR_STRING:
    case FIELD_TYPE_STRING:
      sql_field->pack_flag=0;
      if (sql_field->flags & BINARY_FLAG)
	sql_field->pack_flag|=FIELDFLAG_BINARY;
      break;
    case FIELD_TYPE_ENUM:
      sql_field->pack_flag=pack_length_to_packflag(sql_field->pack_length) |
	FIELDFLAG_INTERVAL;
      sql_field->unireg_check=Field::INTERVAL_FIELD;
      break;
    case FIELD_TYPE_SET:
      sql_field->pack_flag=pack_length_to_packflag(sql_field->pack_length) |
	FIELDFLAG_BITFIELD;
      sql_field->unireg_check=Field::BIT_FIELD;
      break;
    case FIELD_TYPE_DATE:			// Rest of string types
    case FIELD_TYPE_NEWDATE:
    case FIELD_TYPE_TIME:
    case FIELD_TYPE_DATETIME:
    case FIELD_TYPE_NULL:
      sql_field->pack_flag=f_settype((uint) sql_field->sql_type);
      break;
    case FIELD_TYPE_TIMESTAMP:
      sql_field->unireg_check=Field::TIMESTAMP_FIELD;
      /* fall through */
    default:
      sql_field->pack_flag=(FIELDFLAG_NUMBER |
			    (sql_field->flags & UNSIGNED_FLAG ? 0 :
			     FIELDFLAG_DECIMAL) |
			    (sql_field->flags & ZEROFILL_FLAG ?
			     FIELDFLAG_ZEROFILL : 0) |
			    f_settype((uint) sql_field->sql_type) |
			    (sql_field->decimals << FIELDFLAG_DEC_SHIFT));
      break;
    }
    if (!(sql_field->flags & NOT_NULL_FLAG))
      sql_field->pack_flag|=FIELDFLAG_MAYBE_NULL;
    sql_field->offset= pos;
    if (MTYP_TYPENR(sql_field->unireg_check) == Field::NEXT_NUMBER)
      auto_increment++;
    pos+=sql_field->pack_length;
  }
  if (auto_increment > 1)
  {
    my_error(ER_WRONG_AUTO_KEY,MYF(0));
    DBUG_RETURN(-1);
  }
  if (auto_increment &&
      (file->option_flag() & HA_WRONG_ASCII_ORDER))
  {
    my_error(ER_TABLE_CANT_HANDLE_AUTO_INCREMENT,MYF(0));
    DBUG_RETURN(-1);
  }

  if (blob_columns && (file->option_flag() & HA_NO_BLOBS))
  {
    my_error(ER_TABLE_CANT_HANDLE_BLOB,MYF(0));
    DBUG_RETURN(-1);
  }

  /* Create keys */
  List_iterator<Key> key_iterator(keys);
  uint key_parts=0,key_count=keys.elements;
  bool primary_key=0,unique_key=0;
  Key *key;
  uint tmp;
  tmp=min(file->max_keys(), MAX_KEY);

  if (key_count > tmp)
  {
    my_error(ER_TOO_MANY_KEYS,MYF(0),tmp);
    DBUG_RETURN(-1);
  }
  while ((key=key_iterator++))
  {
    tmp=max(file->max_key_parts(),MAX_REF_PARTS);
    if (key->columns.elements > tmp)
    {
      my_error(ER_TOO_MANY_KEY_PARTS,MYF(0),tmp);
      DBUG_RETURN(-1);
    }
    if (key->name() && strlen(key->name()) > NAME_LEN)
    {
      my_error(ER_TOO_LONG_IDENT, MYF(0), key->name());
      DBUG_RETURN(-1);
    }
    key_parts+=key->columns.elements;
  }
  key_info_buffer=key_info=(KEY*) sql_calloc(sizeof(KEY)*key_count);
  key_part_info=(KEY_PART_INFO*) sql_calloc(sizeof(KEY_PART_INFO)*key_parts);
  if (!key_info_buffer || ! key_part_info)
    DBUG_RETURN(-1);				// Out of memory

  key_iterator.rewind();
  for (; (key=key_iterator++) ; key_info++)
  {
    uint key_length=0;
    key_part_spec *column;
    if (key->type == Key::PRIMARY)
    {
      if (primary_key)
      {
	my_error(ER_MULTIPLE_PRI_KEY,MYF(0));
	DBUG_RETURN(-1);
      }
      primary_key=1;
    }
    else if (key->type == Key::UNIQUE)
      unique_key=1;
    key_info->flags= (key->type == Key::MULTIPLE) ? 0 :
                     (key->type == Key::FULLTEXT) ? HA_FULLTEXT : HA_NOSAME;
    key_info->key_parts=(uint8) key->columns.elements;
    key_info->key_part=key_part_info;

    List_iterator<key_part_spec> cols(key->columns);
    for (uint column_nr=0 ; (column=cols++) ; column_nr++)
    {
      it.rewind();
      field=0;
      while ((sql_field=it++) &&
	     my_strcasecmp(column->field_name,sql_field->field_name))
	field++;
      if (!sql_field)
      {
	my_printf_error(ER_KEY_COLUMN_DOES_NOT_EXITS,
			ER(ER_KEY_COLUMN_DOES_NOT_EXITS),MYF(0),
			column->field_name);
	DBUG_RETURN(-1);
      }
      if (f_is_blob(sql_field->pack_flag))
      {
	if (!(file->option_flag() & HA_BLOB_KEY))
	{
	  my_printf_error(ER_BLOB_USED_AS_KEY,ER(ER_BLOB_USED_AS_KEY),MYF(0),
			  column->field_name);
	  DBUG_RETURN(-1);
	}
	if (!column->length)
	{
          if (key->type == Key::FULLTEXT)
            column->length=1; /* ft-code ignores it anyway :-) */
          else
          {
	    my_printf_error(ER_BLOB_KEY_WITHOUT_LENGTH,
			    ER(ER_BLOB_KEY_WITHOUT_LENGTH),MYF(0),
			    column->field_name);
	    DBUG_RETURN(-1);
          }
	}
      }
      if (!(sql_field->flags & NOT_NULL_FLAG))
      {
	if (key->type == Key::PRIMARY)
	{
	  my_error(ER_PRIMARY_CANT_HAVE_NULL, MYF(0));
	  DBUG_RETURN(-1);
	}
	if (!(file->option_flag() & HA_NULL_KEY))
	{
	  my_printf_error(ER_NULL_COLUMN_IN_INDEX,ER(ER_NULL_COLUMN_IN_INDEX),
			  MYF(0),column->field_name);
	  DBUG_RETURN(-1);
	}
      }
      if (MTYP_TYPENR(sql_field->unireg_check) == Field::NEXT_NUMBER)
      {
	if (column_nr == 0 || (file->option_flag() & HA_AUTO_PART_KEY))
	  auto_increment--;			// Field is used
      }
      key_part_info->fieldnr= field;
      key_part_info->offset=  (uint16) sql_field->offset;
      key_part_info->key_type=sql_field->pack_flag;
      uint length=sql_field->pack_length;
      if (column->length)
      {
	if (f_is_blob(sql_field->pack_flag))
	{
	  if ((length=column->length) > file->max_key_length() ||
	      length > file->max_key_part_length())
	  {
	    my_error(ER_WRONG_SUB_KEY,MYF(0));
	    DBUG_RETURN(-1);
	  }
	}
	else if (column->length > length ||
	    (f_is_packed(sql_field->pack_flag) && column->length != length))
	{
	  my_error(ER_WRONG_SUB_KEY,MYF(0));
	  DBUG_RETURN(-1);
	}
	length=column->length;
      }
      else if (length == 0)
      {
	my_printf_error(ER_WRONG_KEY_COLUMN, ER(ER_WRONG_KEY_COLUMN), MYF(0),
			column->field_name);
	  DBUG_RETURN(-1);
      }
      key_part_info->length=(uint8) length;
      /* Use packed keys for long strings on the first column */
      if (!(db_options & HA_OPTION_NO_PACK_KEYS) &&
	  (length >= KEY_DEFAULT_PACK_LENGTH &&
	   (sql_field->sql_type == FIELD_TYPE_STRING ||
	    sql_field->sql_type == FIELD_TYPE_VAR_STRING ||
	    sql_field->pack_flag & FIELDFLAG_BLOB)))
      {
	if (column_nr == 0 && (sql_field->pack_flag & FIELDFLAG_BLOB))
	  key_info->flags|= HA_BINARY_PACK_KEY;
	else
	  key_info->flags|= HA_PACK_KEY;
      }
      key_length+=length;
      key_part_info++;

      /* Create the key name based on the first column (if not given) */
      if (column_nr == 0)
      {
	if (key->type == Key::PRIMARY)
	  key_name="PRIMARY";
	else if (!(key_name = key->name()))
	  key_name=make_unique_key_name(sql_field->field_name,
					key_info_buffer,key_info);
	if (check_if_keyname_exists(key_name,key_info_buffer,key_info))
	{
	  my_error(ER_DUP_KEYNAME,MYF(0),key_name);
	  DBUG_RETURN(-1);
	}
	key_info->name=(char*) key_name;
      }
    }
    key_info->key_length=(uint16) key_length;
    if (key_length > file->max_key_length() && key->type != Key::FULLTEXT)
    {
      my_error(ER_TOO_LONG_KEY,MYF(0),file->max_key_length());
      DBUG_RETURN(-1);
    }
  }
  if (auto_increment > 0)
  {
    my_error(ER_WRONG_AUTO_KEY,MYF(0));
    DBUG_RETURN(-1);
  }
  if (!primary_key && !unique_key &&
      (file->option_flag() & HA_REQUIRE_PRIMARY_KEY))
  {
    my_error(ER_REQUIRES_PRIMARY_KEY,MYF(0));
    DBUG_RETURN(-1);
  }

      /* Check if table exists */
  if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
  {
    sprintf(path,"%s%s%lx_%lx_%x%s",mysql_tmpdir,tmp_file_prefix,
	    current_pid, thd->thread_id, thd->tmp_table++,reg_ext);
    create_info->table_options|=HA_CREATE_DELAY_KEY_WRITE;
  }
  else
    (void) sprintf(path,"%s/%s/%s%s",mysql_data_home,db,table_name,reg_ext);
  unpack_filename(path,path);
  /* Check if table already exists */
  if ((create_info->options & HA_LEX_CREATE_TMP_TABLE)
      && find_temporary_table(thd,db,table_name))
  {
    if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
      DBUG_RETURN(0);
    my_error(ER_TABLE_EXISTS_ERROR,MYF(0),table_name);
    DBUG_RETURN(-1);
  }
  VOID(pthread_mutex_lock(&LOCK_open));
  if (!tmp_table && !(create_info->options & HA_LEX_CREATE_TMP_TABLE))
  {
    if (!access(path,F_OK))
    {
      VOID(pthread_mutex_unlock(&LOCK_open));
      if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS)
	DBUG_RETURN(0);
      my_error(ER_TABLE_EXISTS_ERROR,MYF(0),table_name);
      DBUG_RETURN(-1);
    }
  }

  thd->proc_info="creating table";

  create_info->table_options=db_options;
  if (rea_create_table(path, create_info, fields, key_count,
		       key_info_buffer))
  {
    /* my_error(ER_CANT_CREATE_TABLE,MYF(0),table_name,my_errno); */
    goto end;
  }
  if (!tmp_table && !no_log)
  {
    // Must be written before unlock
    mysql_update_log.write(thd,thd->query, thd->query_length);
    if (mysql_bin_log.is_open())
    {
      Query_log_event qinfo(thd, thd->query);
      mysql_bin_log.write(&qinfo);
    }
  }
  if (create_info->options & HA_LEX_CREATE_TMP_TABLE)
  {
    /* Open table and put in temporary table list */
    if (!(open_temporary_table(thd, path, db, table_name, 1)))
    {
      (void) rm_temporary_table(create_info->db_type, path);
      goto end;
    }
  }
  error=0;
end:
  VOID(pthread_mutex_unlock(&LOCK_open));
  thd->proc_info="After create";
  DBUG_RETURN(error);
}

/*
** Give the key name after the first field with an optional '_#' after
**/

static bool
check_if_keyname_exists(const char *name, KEY *start, KEY *end)
{
  for (KEY *key=start ; key != end ; key++)
    if (!my_strcasecmp(name,key->name))
      return 1;
  return 0;
}


static char *
make_unique_key_name(const char *field_name,KEY *start,KEY *end)
{
  char buff[MAX_FIELD_NAME],*buff_end;

  if (!check_if_keyname_exists(field_name,start,end))
    return (char*) field_name;			// Use fieldname
  buff_end=strmake(buff,field_name,MAX_FIELD_NAME-4);
  for (uint i=2 ; ; i++)
  {
    sprintf(buff_end,"_%d",i);
    if (!check_if_keyname_exists(buff,start,end))
      return sql_strdup(buff);
  }
}

/****************************************************************************
** Create table from a list of fields and items
****************************************************************************/

TABLE *create_table_from_items(THD *thd, HA_CREATE_INFO *create_info,
			       const char *db, const char *name,
			       List<create_field> *extra_fields,
			       List<Key> *keys,
			       List<Item> *items,
			       MYSQL_LOCK **lock)
{
  TABLE tmp_table;		// Used during 'create_field()'
  TABLE *table;
  tmp_table.table_name=0;
  DBUG_ENTER("create_table_from_items");

  /* Add selected items to field list */
  List_iterator<Item> it(*items);
  Item *item;
  Field *tmp_field;
  tmp_table.db_create_options=0;
  tmp_table.null_row=tmp_table.maybe_null=0;
  tmp_table.blob_ptr_size=portable_sizeof_char_ptr;
  tmp_table.db_low_byte_first= test(create_info->db_type == DB_TYPE_MYISAM ||
				    create_info->db_type == DB_TYPE_HEAP);

  while ((item=it++))
  {
    create_field *cr_field;
    if (strlen(item->name) > NAME_LEN ||
	check_column_name(item->name))
    {
      my_error(ER_WRONG_COLUMN_NAME,MYF(0),item->name);
      DBUG_RETURN(0);
    }

    Field *field=create_tmp_field(&tmp_table,item,item->type(),
				  (Item_result_field***) 0, &tmp_field,0,0);
    if (!field ||
	!(cr_field=new create_field(field,(item->type() == Item::FIELD_ITEM ?
					   ((Item_field *)item)->field :
					   (Field*) 0))))
      DBUG_RETURN(0);
    extra_fields->push_back(cr_field);
  }
  /* create and lock table */
  /* QQ: This should be done atomic ! */
  if (mysql_create_table(thd,db,name,create_info,*extra_fields,
			 *keys,0,1)) // no logging
    DBUG_RETURN(0);
  if (!(table=open_table(thd,db,name,name,(bool*) 0)))
  {
    quick_rm_table(create_info->db_type,db,name);
    DBUG_RETURN(0);
  }
  table->reginfo.lock_type=TL_WRITE;
  if (!((*lock)=mysql_lock_tables(thd,&table,1)))
  {
    hash_delete(&open_cache,(byte*) table);
    quick_rm_table(create_info->db_type,db,name);
    DBUG_RETURN(0);
  }
  table->file->extra(HA_EXTRA_WRITE_CACHE);
  DBUG_RETURN(table);
}


/****************************************************************************
** Alter a table definition
****************************************************************************/

bool
mysql_rename_table(enum db_type base,
		   const char *old_db,
		   const char * old_name,
		   const char *new_db,
		   const char * new_name)
{
  char from[FN_REFLEN],to[FN_REFLEN];
  handler *file=get_new_handler((TABLE*) 0, base);
  int error=0;
  DBUG_ENTER("mysql_rename_table");
  (void) sprintf(from,"%s/%s/%s",mysql_data_home,old_db,old_name);
  (void) sprintf(to,"%s/%s/%s",mysql_data_home,new_db,new_name);
  fn_format(from,from,"","",4);
  fn_format(to,to,    "","",4);
  if (!(error=file->rename_table((const char*) from,(const char *) to)))
  {
    if (rename_file_ext(from,to,reg_ext))
    {
      error=my_errno;
      /* Restore old file name */
      file->rename_table((const char*) to,(const char *) from);
    }
  }
  delete file;
  if (error)
    my_error(ER_ERROR_ON_RENAME, MYF(0), from, to, error);
  DBUG_RETURN(error != 0);
}

/*
  close table in this thread and force close + reopen in other threads
  This assumes that the calling thread has lock on LOCK_open
  Win32 clients must also have a WRITE LOCK on the table !
*/

bool close_cached_table(THD *thd,TABLE *table)
{
  bool result=0;
  DBUG_ENTER("close_cached_table");
  if (table)
  {
    VOID(table->file->extra(HA_EXTRA_FORCE_REOPEN)); // Close all data files
    /* Mark all tables that are in use as 'old' */
    mysql_lock_abort(thd,table);		 // end threads waiting on lock

#ifdef REMOVE_LOCKS
    /* Wait until all there are no other threads that has this table open */
    while (remove_table_from_cache(thd,table->table_cache_key,
				   table->table_name))
    {
      dropping_tables++;
      (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
      dropping_tables--;
    }
#else
    (void) remove_table_from_cache(thd,table->table_cache_key,
				   table->table_name);
#endif
    /* When lock on LOCK_open is freed other threads can continue */
    pthread_cond_broadcast(&COND_refresh);

    /* Close lock if this is not got with LOCK TABLES */
    if (thd->lock)
    {
      mysql_unlock_tables(thd, thd->lock); thd->lock=0;	// Start locked threads
    }
    /* Close all copies of 'table'.  This also frees all LOCK TABLES lock */
    thd->open_tables=unlink_open_table(thd,thd->open_tables,table);
  }
  DBUG_RETURN(result);
}

static int send_check_errmsg(THD* thd, TABLE_LIST* table,
			     const char* operator_name, const char* errmsg)

{

  String* packet = &thd->packet;
  packet->length(0);
  net_store_data(packet, table->name);
  net_store_data(packet, (char*)operator_name);
  net_store_data(packet, "error");
  net_store_data(packet, errmsg);
  thd->net.last_error[0]=0;
  if (my_net_write(&thd->net, (char*) thd->packet.ptr(),
		   packet->length()))
    return -1;
  return 1;
}

static int prepare_for_restore(THD* thd, TABLE_LIST* table)
{
  String *packet = &thd->packet;

  if(table->table) // do not overwrite existing tables on restore
    {
      return send_check_errmsg(thd, table, "restore",
			       "table exists, will not overwrite on restore"
			       );
    }
  else
    {
      char* backup_dir = thd->lex.backup_dir;
      char src_path[FN_REFLEN], dst_path[FN_REFLEN];
      char* table_name = table->name;
      char* db = thd->db ? thd->db : table->db;

      if(!fn_format(src_path, table_name, backup_dir, reg_ext, 4 + 64))
	return -1; // protect buffer overflow

      sprintf(dst_path, "%s/%s/%s", mysql_real_data_home, db, table_name);

      int lock_retcode;
      pthread_mutex_lock(&LOCK_open);
      if((lock_retcode = lock_table_name(thd, table)) < 0)
	{
	  pthread_mutex_unlock(&LOCK_open);
	  return -1;
	}

      if(lock_retcode && wait_for_locked_table_names(thd, table))
	{
          pthread_mutex_unlock(&LOCK_open);
	  return -1;
	}
      pthread_mutex_unlock(&LOCK_open);

      if(my_copy(src_path,
		 fn_format(dst_path, dst_path,"",
			   reg_ext, 4),
		 MYF(MY_WME)))
	{
           return send_check_errmsg(thd, table, "restore",
				    "Failed copying .frm file");
	}
      bool save_no_send_ok = thd->net.no_send_ok;
      thd->net.no_send_ok = 1;
      // generate table will try to send OK which messes up the output
      // for the client

      if(generate_table(thd, table, 0))
	{
	  thd->net.no_send_ok = save_no_send_ok;
           return send_check_errmsg(thd, table, "restore",
				    "Failed generating table from .frm file");
	}

      thd->net.no_send_ok = save_no_send_ok;
    }

  return 0;
}

static int mysql_admin_table(THD* thd, TABLE_LIST* tables,
			     HA_CHECK_OPT* check_opt,
			     thr_lock_type lock_type,
			     bool open_for_modify,
			     const char *operator_name,
			     int (handler::*operator_func)
			     (THD *, HA_CHECK_OPT *))
{
  TABLE_LIST *table;
  List<Item> field_list;
  Item* item;
  String* packet = &thd->packet;
  DBUG_ENTER("mysql_admin_table");

  field_list.push_back(item = new Item_empty_string("Table", NAME_LEN*2));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Op", 10));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Msg_type", 10));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Msg_text", 255));
  item->maybe_null = 1;
  if (send_fields(thd, field_list, 1))
    DBUG_RETURN(-1);

  for (table = tables; table; table = table->next)
  {
    char table_name[NAME_LEN*2+2];
    char* db = (table->db) ? table->db : thd->db;
    bool fatal_error=0;
    strxmov(table_name,db ? db : "",".",table->name,NullS);

    if (operator_func == &handler::repair || operator_func == &handler::check)
      thd->open_options|= HA_OPEN_FOR_REPAIR;
    table->table = open_ltable(thd, table, lock_type);
    thd->open_options&= ~HA_OPEN_FOR_REPAIR;
    packet->length(0);
    if (operator_func == &handler::restore)
    {
      switch (prepare_for_restore(thd, table)) {
      case 1: continue; // error, message written to net
      case -1: goto err; // error, message could be written to net
      default: ;// should be 0 otherwise
      }

      // now we should be able to open the partially restored table
      // to finish the restore in the handler later on
      table->table = reopen_name_locked_table(thd, table);
    }

    if (!table->table)
    {
      const char *err_msg;
      net_store_data(packet, table_name);
      net_store_data(packet, operator_name);
      net_store_data(packet, "error");
      if (!(err_msg=thd->net.last_error))
	err_msg=ER(ER_CHECK_NO_SUCH_TABLE);
      net_store_data(packet, err_msg);
      thd->net.last_error[0]=0;
      if (my_net_write(&thd->net, (char*) thd->packet.ptr(),
		       packet->length()))
	goto err;
      continue;
    }
    if ((table->table->db_stat & HA_READ_ONLY) && open_for_modify)
    {
      char buff[FN_REFLEN + MYSQL_ERRMSG_SIZE];
      net_store_data(packet, table_name);
      net_store_data(packet, operator_name);
      net_store_data(packet, "error");
      sprintf(buff, ER(ER_OPEN_AS_READONLY), table_name);
      net_store_data(packet, buff);
      close_thread_tables(thd);
      if (my_net_write(&thd->net, (char*) thd->packet.ptr(),
		       packet->length()))
	goto err;
      continue;
    }

    /* Close all instances of the table to allow repair to rename files */
    if (open_for_modify && table->table->version)
    {
      pthread_mutex_lock(&LOCK_open);
      mysql_lock_abort(thd,table->table);
      while (remove_table_from_cache(thd, table->table->table_cache_key,
				     table->table->real_name) &&
	     ! thd->killed)
      {
	dropping_tables++;
	(void) pthread_cond_wait(&COND_refresh,&LOCK_open);
	dropping_tables--;
      }
      pthread_mutex_unlock(&LOCK_open);
      if (thd->killed)
	goto err;
    }

    int result_code = (table->table->file->*operator_func)(thd, check_opt);
    packet->length(0);
    net_store_data(packet, table_name);
    net_store_data(packet, operator_name);

    switch (result_code) {
    case HA_ADMIN_NOT_IMPLEMENTED:
      net_store_data(packet, "error");
      net_store_data(packet, ER(ER_CHECK_NOT_IMPLEMENTED));
      break;

    case HA_ADMIN_OK:
      net_store_data(packet, "status");
      net_store_data(packet, "OK");
      break;

    case HA_ADMIN_FAILED:
      net_store_data(packet, "status");
      net_store_data(packet, "Operation failed");
      break;

    case HA_ADMIN_ALREADY_DONE:
      net_store_data(packet, "status");
      net_store_data(packet, "Table is already up to date");
      break;

    case HA_ADMIN_CORRUPT:
      net_store_data(packet, "error");
      net_store_data(packet, "Corrupt");
      fatal_error=1;
      break;

    case HA_ADMIN_INVALID:
      net_store_data(packet, "error");
      net_store_data(packet, "Invalid argument");
      break;

    default:				// Probably HA_ADMIN_INTERNAL_ERROR
      net_store_data(packet, "error");
      net_store_data(packet, "Unknown - internal error during operation");
      fatal_error=1;
      break;
    }
    if (fatal_error)
      table->table->version=0;			// Force close of table
    close_thread_tables(thd);
    if (my_net_write(&thd->net, (char*) packet->ptr(),
		     packet->length()))
      goto err;
  }

  send_eof(&thd->net);
  DBUG_RETURN(0);
 err:
  close_thread_tables(thd);			// Shouldn't be needed
  DBUG_RETURN(-1);
}

int mysql_backup_table(THD* thd, TABLE_LIST* table_list)
{
  DBUG_ENTER("mysql_backup_table");
  DBUG_RETURN(mysql_admin_table(thd, table_list, 0,
				TL_READ, 1,
				"backup",
				&handler::backup));
}
int mysql_restore_table(THD* thd, TABLE_LIST* table_list)
{
  DBUG_ENTER("mysql_restore_table");
  DBUG_RETURN(mysql_admin_table(thd, table_list, 0,
				TL_WRITE, 1,
				"restore",
				&handler::restore));
}

int mysql_repair_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
{
  DBUG_ENTER("mysql_repair_table");
  DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
				TL_WRITE, 1,
				"repair",
				&handler::repair));
}

int mysql_optimize_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
{
  DBUG_ENTER("mysql_optimize_table");
  DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
				TL_WRITE, 1,
				"optimize",
				&handler::optimize));
}


int mysql_analyze_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt)
{
  DBUG_ENTER("mysql_analyze_table");
  DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
				TL_READ_NO_INSERT, 1,
				"analyze",
				&handler::analyze));
}


int mysql_check_table(THD* thd, TABLE_LIST* tables,HA_CHECK_OPT* check_opt)
{
  DBUG_ENTER("mysql_check_table");
  DBUG_RETURN(mysql_admin_table(thd, tables, check_opt,
				TL_READ_NO_INSERT, 0,
				"check",
				&handler::check));
}


int mysql_alter_table(THD *thd,char *new_db, char *new_name,
		      HA_CREATE_INFO *create_info,
		      TABLE_LIST *table_list,
		      List<create_field> &fields,
		      List<Key> &keys,List<Alter_drop> &drop_list,
		      List<Alter_column> &alter_list,
                      ORDER *order,
		      bool drop_primary,
		      enum enum_duplicates handle_duplicates)
{
  TABLE *table,*new_table;
  int error;
  char tmp_name[80],old_name[32],new_name_buff[FN_REFLEN],
    *table_name,*db;
  bool use_timestamp=0;
  ha_rows copied,deleted;
  ulonglong next_insert_id;
  uint save_time_stamp,db_create_options;
  enum db_type old_db_type,new_db_type;
  DBUG_ENTER("mysql_alter_table");

  thd->proc_info="init";
  table_name=table_list->real_name;
  db=table_list->db;
  if (!new_db)
    new_db=db;

  if (!(table=open_ltable(thd,table_list,TL_WRITE_ALLOW_READ)))
    DBUG_RETURN(-1);

  /* Check that we are not trying to rename to an existing table */
  if (new_name)
  {
    strmov(new_name_buff,new_name);
    fn_same(new_name_buff,table_name,3);
#ifdef FN_LOWER_CASE
    if (!my_strcasecmp(new_name_buff,table_name))// Check if name changed
#else
    if (!strcmp(new_name_buff,table_name))	// Check if name changed
#endif
      new_name=table_name;			// No. Make later check easier
    else
    {
      if (table->tmp_table)
      {
	if (find_temporary_table(thd,new_db,new_name_buff))
	{
	  my_error(ER_TABLE_EXISTS_ERROR,MYF(0),new_name);
	  DBUG_RETURN(-1);
	}
      }
      else
      {
	if (!access(fn_format(new_name_buff,new_name_buff,new_db,reg_ext,0),
		    F_OK))
	{
	  /* Table will be closed in do_command() */
	  my_error(ER_TABLE_EXISTS_ERROR,MYF(0),new_name);
	  DBUG_RETURN(-1);
	}
      }
    }
  }
  else
    new_name=table_name;

  old_db_type=table->db_type;
  if (create_info->db_type == DB_TYPE_DEFAULT)
    create_info->db_type=old_db_type;
  if (create_info->row_type == ROW_TYPE_DEFAULT)
    create_info->row_type=table->row_type;
  new_db_type=create_info->db_type;

  /* Check if the user only wants to do a simple RENAME */

  thd->proc_info="setup";
  if (new_name != table_name &&
      !fields.elements && !keys.elements && ! drop_list.elements &&
      !alter_list.elements && !drop_primary &&
      new_db_type == old_db_type && create_info->max_rows == 0 &&
      create_info->auto_increment_value == 0 && !table->tmp_table)
  {
    thd->proc_info="rename";
    VOID(pthread_mutex_lock(&LOCK_open));
    /* Then do a 'simple' rename of the table */
    error=0;
    if (!access(new_name_buff,F_OK))
    {
      my_error(ER_TABLE_EXISTS_ERROR,MYF(0),new_name);
      error= -1;
    }
    else
    {
      *fn_ext(new_name)=0;
      close_cached_table(thd,table);
      if (mysql_rename_table(old_db_type,db,table_name,new_db,new_name))
	error= -1;
    }
    VOID(pthread_cond_broadcast(&COND_refresh));
    VOID(pthread_mutex_unlock(&LOCK_open));
    if (!error)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(&thd->net);
    }

    DBUG_RETURN(error);
  }

  /* Full alter table */
  restore_record(table,2);			// Empty record for DEFAULT
  List_iterator<Alter_drop> drop_it(drop_list);
  List_iterator<create_field> def_it(fields);
  List_iterator<Alter_column> alter_it(alter_list);
  List<create_field> create_list;		// Add new fields here
  List<Key> key_list;				// Add new keys here

  /*
  ** First collect all fields from table which isn't in drop_list
  */

  create_field *def;
  Field **f_ptr,*field;
  for (f_ptr=table->field ; (field= *f_ptr) ; f_ptr++)
  {
    /* Check if field should be droped */
    Alter_drop *drop;
    drop_it.rewind();
    while ((drop=drop_it++))
    {
      if (drop->type == Alter_drop::COLUMN &&
	  !my_strcasecmp(field->field_name, drop->name))
	break;
    }
    if (drop)
    {
      drop_it.remove();
      continue;
    }
    /* Check if field is changed */
    def_it.rewind();
    while ((def=def_it++))
    {
      if (def->change && !my_strcasecmp(field->field_name, def->change))
	break;
    }
    if (def)
    {						// Field is changed
      def->field=field;
      if (def->sql_type == FIELD_TYPE_TIMESTAMP)
	use_timestamp=1;
      create_list.push_back(def);
      def_it.remove();
    }
    else
    {						// Use old field value
      create_list.push_back(def=new create_field(field,field));
      if (def->sql_type == FIELD_TYPE_TIMESTAMP)
	use_timestamp=1;

      alter_it.rewind();			// Change default if ALTER
      Alter_column *alter;
      while ((alter=alter_it++))
      {
	if (!my_strcasecmp(field->field_name, alter->name))
	  break;
      }
      if (alter)
      {
        if (def->sql_type == FIELD_TYPE_BLOB)
        {
          my_error(ER_BLOB_CANT_HAVE_DEFAULT,MYF(0),def->change);
          DBUG_RETURN(-1);
        }
	def->def=alter->def;			// Use new default
	alter_it.remove();
      }
    }
  }
  def_it.rewind();
  List_iterator<create_field> find_it(create_list);
  while ((def=def_it++))			// Add new columns
  {
    if (def->change)
    {
      my_error(ER_BAD_FIELD_ERROR,MYF(0),def->change,table_name);
      DBUG_RETURN(-1);
    }
    if (!def->after)
      create_list.push_back(def);
    else if (def->after == first_keyword)
      create_list.push_front(def);
    else
    {
      create_field *find;
      find_it.rewind();
      while ((find=find_it++))			// Add new columns
      {
	if (!my_strcasecmp(def->after, find->field_name))
	  break;
      }
      if (!find)
      {
	my_error(ER_BAD_FIELD_ERROR,MYF(0),def->after,table_name);
	DBUG_RETURN(-1);
      }
      find_it.after(def);			// Put element after this
    }
  }
  if (alter_list.elements)
  {
    my_error(ER_BAD_FIELD_ERROR,MYF(0),alter_list.head()->name,table_name);
    DBUG_RETURN(-1);
  }
  if (!create_list.elements)
  {
    my_error(ER_CANT_REMOVE_ALL_FIELDS,MYF(0));
    DBUG_RETURN(-1);
  }

  /*
  ** Collect all keys which isn't in drop list. Add only those
  ** for which some fields exists.
  */

  List_iterator<Key> key_it(keys);
  List_iterator<create_field> field_it(create_list);
  List<key_part_spec> key_parts;

  KEY *key_info=table->key_info;
  for (uint i=0 ; i < table->keys ; i++,key_info++)
  {
    if (drop_primary && (key_info->flags & HA_NOSAME))
    {
      drop_primary=0;
      continue;
    }

    char *key_name=key_info->name;
    Alter_drop *drop;
    drop_it.rewind();
    while ((drop=drop_it++))
    {
      if (drop->type == Alter_drop::KEY &&
	  !my_strcasecmp(key_name, drop->name))
	break;
    }
    if (drop)
    {
      drop_it.remove();
      continue;
    }

    KEY_PART_INFO *key_part= key_info->key_part;
    key_parts.empty();
    for (uint j=0 ; j < key_info->key_parts ; j++,key_part++)
    {
      if (!key_part->field)
	continue;				// Wrong field (from UNIREG)
      const char *key_part_name=key_part->field->field_name;
      create_field *cfield;
      field_it.rewind();
      while ((cfield=field_it++))
      {
	if (cfield->change)
	{
	  if (!my_strcasecmp(key_part_name, cfield->change))
	    break;
	}
	else if (!my_strcasecmp(key_part_name, cfield->field_name))
	    break;
      }
      if (!cfield)
	continue;				// Field is removed
      uint key_part_length=key_part->length;
      if (cfield->field)			// Not new field
      {						// Check if sub key
	if (cfield->field->type() != FIELD_TYPE_BLOB &&
	    (cfield->field->pack_length() == key_part_length ||
	     cfield->length != cfield->pack_length ||
	     cfield->pack_length <= key_part_length))
	  key_part_length=0;			// Use whole field
      }
      key_parts.push_back(new key_part_spec(cfield->field_name,
					    key_part_length));
    }
    if (key_parts.elements)
      key_list.push_back(new Key(key_info->flags & HA_NOSAME ?
				 (!my_strcasecmp(key_name, "PRIMARY") ?
				  Key::PRIMARY  : Key::UNIQUE) :
                                 (key_info->flags & HA_FULLTEXT ?
                                 Key::FULLTEXT : Key::MULTIPLE),
				 key_name,key_parts));
  }
  key_it.rewind();
  {
    Key *key;
    while ((key=key_it++))			// Add new keys
      key_list.push_back(key);
  }

  if (drop_list.elements)
  {
    my_error(ER_CANT_DROP_FIELD_OR_KEY,MYF(0),drop_list.head()->name);
    goto err;
  }
  if (alter_list.elements)
  {
    my_error(ER_CANT_DROP_FIELD_OR_KEY,MYF(0),alter_list.head()->name);
    goto err;
  }

  (void) sprintf(tmp_name,"%s-%lx_%lx", tmp_file_prefix, current_pid,
		 thd->thread_id);
  create_info->db_type=new_db_type;
  if (!create_info->max_rows)
    create_info->max_rows=table->max_rows;
  if (!create_info->avg_row_length)
    create_info->avg_row_length=table->avg_row_length;
  table->file->update_create_info(create_info);
  if (!create_info->comment)
    create_info->comment=table->comment;
  /* let new create options override the old ones */
  db_create_options=table->db_create_options & ~(HA_OPTION_PACK_RECORD);
  if (create_info->table_options &
      (HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS))
    db_create_options&= ~(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS);
  if (create_info->table_options &
      (HA_OPTION_CHECKSUM | HA_OPTION_NO_CHECKSUM))
    db_create_options&= ~(HA_OPTION_CHECKSUM | HA_OPTION_NO_CHECKSUM);
  if (create_info->table_options &
      (HA_OPTION_DELAY_KEY_WRITE | HA_OPTION_NO_DELAY_KEY_WRITE))
    db_create_options&= ~(HA_OPTION_DELAY_KEY_WRITE |
			  HA_OPTION_NO_DELAY_KEY_WRITE);
  create_info->table_options|= db_create_options;

  if (table->tmp_table)
    create_info->options|=HA_LEX_CREATE_TMP_TABLE;

  if ((error=mysql_create_table(thd, new_db, tmp_name,
				create_info,
				create_list,key_list,1,1))) // no logging
    DBUG_RETURN(error);
  {
    if (table->tmp_table)
      new_table=open_table(thd,new_db,tmp_name,tmp_name,0);
    else
    {
      char path[FN_REFLEN];
      (void) sprintf(path,"%s/%s/%s",mysql_data_home,new_db,tmp_name);
      fn_format(path,path,"","",4+16+32);
      new_table=open_temporary_table(thd, path, new_db, tmp_name,0);
    }
    if (!new_table)
    {
      VOID(quick_rm_table(new_db_type,new_db,tmp_name));
      goto err;
    }
  }

  save_time_stamp=new_table->time_stamp;
  if (use_timestamp)
    new_table->time_stamp=0;
  new_table->next_number_field=new_table->found_next_number_field;
  thd->count_cuted_fields=1;			// calc cuted fields
  thd->cuted_fields=0L;
  thd->proc_info="copy to tmp table";
  next_insert_id=thd->next_insert_id;		// Remember for loggin
  error=copy_data_between_tables(table,new_table,create_list,handle_duplicates,
				 order, &copied,&deleted);
  thd->last_insert_id=next_insert_id;		// Needed for correct log
  thd->count_cuted_fields=0;			/* Don`t calc cuted fields */
  new_table->time_stamp=save_time_stamp;

  if (table->tmp_table)
  {
    /* We changed a temporary table */
    if (error)
    {
      close_temporary_table(thd,new_db,tmp_name);
      my_free((gptr) new_table,MYF(0));
      goto err;
    }
    /* Remove link to old table and rename the new one */
    close_temporary_table(thd,table->table_cache_key,table_name);
    if (rename_temporary_table(new_table, new_db, new_name))
    {						// Fatal error
      close_temporary_table(thd,new_db,tmp_name);
      my_free((gptr) new_table,MYF(0));
      goto err;
    }
    mysql_update_log.write(thd, thd->query,thd->query_length);
    if (mysql_bin_log.is_open())
    {
      Query_log_event qinfo(thd, thd->query);
      mysql_bin_log.write(&qinfo);
    }
    goto end_temporary;
  }

  intern_close_table(new_table);		/* close temporary table */
  my_free((gptr) new_table,MYF(0));
  VOID(pthread_mutex_lock(&LOCK_open));
  if (error)
  {
    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
    VOID(pthread_mutex_unlock(&LOCK_open));
    goto err;
  }
  /*
  ** Data is copied.  Now we rename the old table to a temp name,
  ** rename the new one to the old name, remove all entries from the old table
  ** from the cash, free all locks, close the old table and remove it.
  */

  thd->proc_info="rename result table";
  sprintf(old_name,"%s2-%lx-%lx", tmp_file_prefix, current_pid,
	  thd->thread_id);
  if (new_name != table_name)
  {
    if (!access(new_name_buff,F_OK))
    {
      error=1;
      my_error(ER_TABLE_EXISTS_ERROR,MYF(0),new_name_buff);
      VOID(quick_rm_table(new_db_type,new_db,tmp_name));
      VOID(pthread_mutex_unlock(&LOCK_open));
      goto err;
    }
  }

#if defined( __WIN__) || defined( __EMX__)
  // Win32 can't rename an open table, so we must close the org table!
  table_name=thd->strdup(table_name);		// must be saved
  if (close_cached_table(thd,table))
  {						// Aborted
    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
    VOID(pthread_mutex_unlock(&LOCK_open));
    goto err;
  }
  table=0;					// Marker for win32 version
#endif

  error=0;
  if (mysql_rename_table(old_db_type,db,table_name,db,old_name))
  {
    error=1;
    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
  }
  else if (mysql_rename_table(new_db_type,new_db,tmp_name,new_db,
			      new_name))
  {						// Try to get everything back
    error=1;
    VOID(quick_rm_table(new_db_type,new_db,new_name));
    VOID(quick_rm_table(new_db_type,new_db,tmp_name));
    VOID(mysql_rename_table(old_db_type,db,old_name,db,table_name));
  }
  if (error)
  {
    // This shouldn't happen.  We solve this the safe way by
    // closing the locked table.
    close_cached_table(thd,table);
    VOID(pthread_mutex_unlock(&LOCK_open));
    goto err;
  }
  if (thd->lock || new_name != table_name)	// True if WIN32
  {
    // Not table locking or alter table with rename
    // free locks and remove old table
    close_cached_table(thd,table);
    VOID(quick_rm_table(old_db_type,db,old_name));
  }
  else
  {
    // Using LOCK TABLES without rename.
    // This code is never executed on WIN32!
    // Remove old renamed table, reopen table and get new locks
    if (table)
    {
      VOID(table->file->extra(HA_EXTRA_FORCE_REOPEN)); // Use new file
      remove_table_from_cache(thd,db,table_name); // Mark all in-use copies old
      mysql_lock_abort(thd,table);		 // end threads waiting on lock
    }
    VOID(quick_rm_table(old_db_type,db,old_name));
    if (close_data_tables(thd,db,table_name) ||
	reopen_tables(thd,1,0))
    {						// This shouldn't happen
      close_cached_table(thd,table);		// Remove lock for table
      VOID(pthread_mutex_unlock(&LOCK_open));
      goto err;
    }
  }
  /* The ALTER TABLE is always in it's own transaction */
  error = ha_commit_stmt(thd);
  if (ha_commit(thd))
    error=1;
  if (error)
  {
    VOID(pthread_cond_broadcast(&COND_refresh));
    VOID(pthread_mutex_unlock(&LOCK_open));
    goto err;
  }

  thd->proc_info="end";
  mysql_update_log.write(thd, thd->query,thd->query_length);
  if (mysql_bin_log.is_open())
  {
    Query_log_event qinfo(thd, thd->query);
    mysql_bin_log.write(&qinfo);
  }
  VOID(pthread_cond_broadcast(&COND_refresh));
  VOID(pthread_mutex_unlock(&LOCK_open));

end_temporary:
  sprintf(tmp_name,ER(ER_INSERT_INFO),(ulong) (copied+deleted),
	  (ulong) deleted, thd->cuted_fields);
  send_ok(&thd->net,copied+deleted,0L,tmp_name);
  thd->some_tables_deleted=0;
  DBUG_RETURN(0);

 err:
  DBUG_RETURN(-1);
}


static int
copy_data_between_tables(TABLE *from,TABLE *to,
                         List<create_field> &create,
			 enum enum_duplicates handle_duplicates,
                         ORDER *order,
			 ha_rows *copied,
                         ha_rows *deleted)
{
  int error;
  Copy_field *copy,*copy_end;
  ulong found_count,delete_count;
  THD *thd= current_thd;
  uint length;
  SORT_FIELD *sortorder;
  READ_RECORD info;
  Field *next_field;
  TABLE_LIST   tables;
  List<Item>   fields;
  List<Item>   all_fields;
  DBUG_ENTER("copy_data_between_tables");

  if (!(copy= new Copy_field[to->fields]))
    DBUG_RETURN(-1);				/* purecov: inspected */

  to->file->external_lock(thd,F_WRLCK);
  to->file->extra(HA_EXTRA_WRITE_CACHE);
  from->file->info(HA_STATUS_VARIABLE);
  to->file->deactivate_non_unique_index(from->file->records);

  List_iterator<create_field> it(create);
  create_field *def;
  copy_end=copy;
  for (Field **ptr=to->field ; *ptr ; ptr++)
  {
    def=it++;
    if (def->field)
      (copy_end++)->set(*ptr,def->field,0);
  }

  if(order) {
    from->io_cache=(IO_CACHE*) my_malloc(sizeof(IO_CACHE),
                                         MYF(MY_FAE | MY_ZEROFILL));
    bzero((char*) &tables,sizeof(tables));
    tables.table = from;
    error=1;

    if (setup_order(thd, &tables, fields, all_fields, order) ||
        !(sortorder=make_unireg_sortorder(order, &length)) ||
        (from->found_records = filesort(&from, sortorder, length, 
                                         (SQL_SELECT *) 0, 0L, HA_POS_ERROR))
        == HA_POS_ERROR)
      goto err;
  };

  init_read_record(&info, thd, from, (SQL_SELECT *) 0, 1,1);

  found_count=delete_count=0;
  next_field=to->next_number_field;
  while (!(error=info.read_record(&info)))
  {
    if (thd->killed)
    {
      my_error(ER_SERVER_SHUTDOWN,MYF(0));
      error= 1;
      break;
    }
    if (next_field)
      next_field->reset();
    for (Copy_field *copy_ptr=copy ; copy_ptr != copy_end ; copy_ptr++)
      copy_ptr->do_copy(copy_ptr);
    if ((error=to->file->write_row((byte*) to->record[0])))
    {
      if (handle_duplicates != DUP_IGNORE ||
	  (error != HA_ERR_FOUND_DUPP_KEY &&
	   error != HA_ERR_FOUND_DUPP_UNIQUE))
      {
	to->file->print_error(error,MYF(0));
	break;
      }
      delete_count++;
    }
    else
      found_count++;
  }
  end_read_record(&info);
  delete [] copy;
  uint tmp_error;
  if ((tmp_error=to->file->extra(HA_EXTRA_NO_CACHE)))
  {
    to->file->print_error(tmp_error,MYF(0));
    error=1;
  }
  if (to->file->activate_all_index(thd))
    error=1;

  /*
    Ensure that the new table is saved properly to disk so that we
    can do a rename
  */
  if (ha_commit_stmt(thd))
    error=1;
  if (ha_commit(thd))
    error=1;
  if (to->file->external_lock(thd,F_UNLCK))
    error=1;
 err:
  free_io_cache(from);
  *copied= found_count;
  *deleted=delete_count;
  DBUG_RETURN(error > 0 ? -1 : 0);
}
