~drizzle-trunk/drizzle/development : contents of drizzled/sql

~drizzle-trunk/drizzle/development : (revision 264)
/* Copyright (C) 2000-2006 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; version 2 of the License.

   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 implements classes defined in sql_class.h
** Especially the classes to handle a result from a select
**
*****************************************************************************/

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

#include "mysql_priv.h"
#include "rpl_rli.h"
#include "rpl_record.h"
#include "slave.h"
#include "log_event.h"
#include <sys/stat.h>
#include <mysys/thr_alarm.h>
#include <mysys/mysys_err.h>
#include <drizzled/drizzled_error_messages.h>

/*
  The following is used to initialise Table_ident with a internal
  table name
*/
char internal_table_name[2]= "*";
char empty_c_string[1]= {0};    /* used for not defined db */

const char * const THD::DEFAULT_WHERE= "field list";


/*****************************************************************************
** Instansiate templates
*****************************************************************************/

#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
/* Used templates */
template class List<Key>;
template class List_iterator<Key>;
template class List<Key_part_spec>;
template class List_iterator<Key_part_spec>;
template class List<Alter_drop>;
template class List_iterator<Alter_drop>;
template class List<Alter_column>;
template class List_iterator<Alter_column>;
#endif

/****************************************************************************
** User variables
****************************************************************************/

extern "C" uchar *get_var_key(user_var_entry *entry, size_t *length,
                              bool not_used __attribute__((unused)))
{
  *length= entry->name.length;
  return (uchar*) entry->name.str;
}

extern "C" void free_user_var(user_var_entry *entry)
{
  char *pos= (char*) entry+ALIGN_SIZE(sizeof(*entry));
  if (entry->value && entry->value != pos)
    my_free(entry->value, MYF(0));
  my_free((char*) entry,MYF(0));
}

bool Key_part_spec::operator==(const Key_part_spec& other) const
{
  return length == other.length &&
         field_name.length == other.field_name.length &&
         !strcmp(field_name.str, other.field_name.str);
}

/**
  Construct an (almost) deep copy of this key. Only those
  elements that are known to never change are not copied.
  If out of memory, a partial copy is returned and an error is set
  in THD.
*/

Key::Key(const Key &rhs, MEM_ROOT *mem_root)
  :type(rhs.type),
  key_create_info(rhs.key_create_info),
  columns(rhs.columns, mem_root),
  name(rhs.name),
  generated(rhs.generated)
{
  list_copy_and_replace_each_value(columns, mem_root);
}

/**
  Construct an (almost) deep copy of this foreign key. Only those
  elements that are known to never change are not copied.
  If out of memory, a partial copy is returned and an error is set
  in THD.
*/

Foreign_key::Foreign_key(const Foreign_key &rhs, MEM_ROOT *mem_root)
  :Key(rhs),
  ref_table(rhs.ref_table),
  ref_columns(rhs.ref_columns),
  delete_opt(rhs.delete_opt),
  update_opt(rhs.update_opt),
  match_opt(rhs.match_opt)
{
  list_copy_and_replace_each_value(ref_columns, mem_root);
}

/*
  Test if a foreign key (= generated key) is a prefix of the given key
  (ignoring key name, key type and order of columns)

  NOTES:
    This is only used to test if an index for a FOREIGN KEY exists

  IMPLEMENTATION
    We only compare field names

  RETURN
    0	Generated key is a prefix of other key
    1	Not equal
*/

bool foreign_key_prefix(Key *a, Key *b)
{
  /* Ensure that 'a' is the generated key */
  if (a->generated)
  {
    if (b->generated && a->columns.elements > b->columns.elements)
      swap_variables(Key*, a, b);               // Put shorter key in 'a'
  }
  else
  {
    if (!b->generated)
      return true;                              // No foreign key
    swap_variables(Key*, a, b);                 // Put generated key in 'a'
  }

  /* Test if 'a' is a prefix of 'b' */
  if (a->columns.elements > b->columns.elements)
    return true;                                // Can't be prefix

  List_iterator<Key_part_spec> col_it1(a->columns);
  List_iterator<Key_part_spec> col_it2(b->columns);
  const Key_part_spec *col1, *col2;

#ifdef ENABLE_WHEN_INNODB_CAN_HANDLE_SWAPED_FOREIGN_KEY_COLUMNS
  while ((col1= col_it1++))
  {
    bool found= 0;
    col_it2.rewind();
    while ((col2= col_it2++))
    {
      if (*col1 == *col2)
      {
        found= true;
	break;
      }
    }
    if (!found)
      return true;                              // Error
  }
  return false;                                 // Is prefix
#else
  while ((col1= col_it1++))
  {
    col2= col_it2++;
    if (!(*col1 == *col2))
      return true;
  }
  return false;                                 // Is prefix
#endif
}


/****************************************************************************
** Thread specific functions
****************************************************************************/

Open_tables_state::Open_tables_state(ulong version_arg)
  :version(version_arg), state_flags(0U)
{
  reset_open_tables_state();
}

/*
  The following functions form part of the C plugin API
*/

extern "C" int mysql_tmpfile(const char *prefix)
{
  char filename[FN_REFLEN];
  File fd = create_temp_file(filename, mysql_tmpdir, prefix,
                             O_CREAT | O_EXCL | O_RDWR | O_TEMPORARY,
                             MYF(MY_WME));
  if (fd >= 0) {
    /*
      This can be removed once the following bug is fixed:
      Bug #28903  create_temp_file() doesn't honor O_TEMPORARY option
                  (file not removed) (Unix)
    */
    unlink(filename);
  }

  return fd;
}


extern "C"
int thd_in_lock_tables(const THD *thd)
{
  return test(thd->in_lock_tables);
}


extern "C"
int thd_tablespace_op(const THD *thd)
{
  return test(thd->tablespace_op);
}


extern "C"
const char *set_thd_proc_info(THD *thd, const char *info,
                              const char *calling_function __attribute__((unused)),
                              const char *calling_file __attribute__((unused)),
                              const unsigned int calling_line __attribute__((unused)))
{
  const char *old_info= thd->proc_info;
  thd->proc_info= info;
  return old_info;
}

extern "C"
void **thd_ha_data(const THD *thd, const struct handlerton *hton)
{
  return (void **) &thd->ha_data[hton->slot].ha_ptr;
}

extern "C"
int64_t thd_test_options(const THD *thd, int64_t test_options)
{
  return thd->options & test_options;
}

extern "C"
int thd_sql_command(const THD *thd)
{
  return (int) thd->lex->sql_command;
}

extern "C"
int thd_tx_isolation(const THD *thd)
{
  return (int) thd->variables.tx_isolation;
}

extern "C"
void thd_inc_row_count(THD *thd)
{
  thd->row_count++;
}

/*
  Dumps a text description of a thread, its security context
  (user, host) and the current query.

  SYNOPSIS
    thd_security_context()
    thd                 current thread context
    buffer              pointer to preferred result buffer
    length              length of buffer
    max_query_len       how many chars of query to copy (0 for all)

  RETURN VALUES
    pointer to string
*/
extern "C"
char *thd_security_context(THD *thd, char *buffer, unsigned int length,
                           unsigned int max_query_len)
{
  String str(buffer, length, &my_charset_latin1);
  const Security_context *sctx= &thd->main_security_ctx;
  char header[64];
  int len;

  len= snprintf(header, sizeof(header),
                "MySQL thread id %lu, query id %lu",
                thd->thread_id, (ulong) thd->query_id);
  str.length(0);
  str.append(header, len);

  if (sctx->host)
  {
    str.append(' ');
    str.append(sctx->host);
  }

  if (sctx->ip)
  {
    str.append(' ');
    str.append(sctx->ip);
  }

  if (sctx->user)
  {
    str.append(' ');
    str.append(sctx->user);
  }

  if (thd->proc_info)
  {
    str.append(' ');
    str.append(thd->proc_info);
  }

  if (thd->query)
  {
    if (max_query_len < 1)
      len= thd->query_length;
    else
      len= min(thd->query_length, max_query_len);
    str.append('\n');
    str.append(thd->query, len);
  }
  if (str.c_ptr_safe() == buffer)
    return buffer;
  return thd->strmake(str.ptr(), str.length());
}

/**
  Clear this diagnostics area. 

  Normally called at the end of a statement.
*/

void
Diagnostics_area::reset_diagnostics_area()
{
  can_overwrite_status= false;
  /** Don't take chances in production */
  m_message[0]= '\0';
  m_sql_errno= 0;
  m_server_status= 0;
  m_affected_rows= 0;
  m_last_insert_id= 0;
  m_total_warn_count= 0;
  is_sent= false;
  /** Tiny reset in debug mode to see garbage right away */
  m_status= DA_EMPTY;
}


/**
  Set OK status -- ends commands that do not return a
  result set, e.g. INSERT/UPDATE/DELETE.
*/

void
Diagnostics_area::set_ok_status(THD *thd, ha_rows affected_rows_arg,
                                uint64_t last_insert_id_arg,
                                const char *message_arg)
{
  assert(! is_set());
  /*
    In production, refuse to overwrite an error or a custom response
    with an OK packet.
  */
  if (is_error() || is_disabled())
    return;
  /** Only allowed to report success if has not yet reported an error */

  m_server_status= thd->server_status;
  m_total_warn_count= thd->total_warn_count;
  m_affected_rows= affected_rows_arg;
  m_last_insert_id= last_insert_id_arg;
  if (message_arg)
    strmake(m_message, message_arg, sizeof(m_message) - 1);
  else
    m_message[0]= '\0';
  m_status= DA_OK;
}


/**
  Set EOF status.
*/

void
Diagnostics_area::set_eof_status(THD *thd)
{
  /** Only allowed to report eof if has not yet reported an error */

  assert(! is_set());
  /*
    In production, refuse to overwrite an error or a custom response
    with an EOF packet.
  */
  if (is_error() || is_disabled())
    return;

  m_server_status= thd->server_status;
  /*
    If inside a stored procedure, do not return the total
    number of warnings, since they are not available to the client
    anyway.
  */
  m_total_warn_count= thd->total_warn_count;

  m_status= DA_EOF;
}

/**
  Set ERROR status.
*/

void
Diagnostics_area::set_error_status(THD *thd __attribute__((unused)),
                                   uint sql_errno_arg,
                                   const char *message_arg)
{
  /*
    Only allowed to report error if has not yet reported a success
    The only exception is when we flush the message to the client,
    an error can happen during the flush.
  */
  assert(! is_set() || can_overwrite_status);
  /*
    In production, refuse to overwrite a custom response with an
    ERROR packet.
  */
  if (is_disabled())
    return;

  m_sql_errno= sql_errno_arg;
  strmake(m_message, message_arg, sizeof(m_message) - 1);

  m_status= DA_ERROR;
}


/**
  Mark the diagnostics area as 'DISABLED'.

  This is used in rare cases when the COM_ command at hand sends a response
  in a custom format. One example is the query cache, another is
  COM_STMT_PREPARE.
*/

void
Diagnostics_area::disable_status()
{
  assert(! is_set());
  m_status= DA_DISABLED;
}


THD::THD()
   :Statement(&main_lex, &main_mem_root, CONVENTIONAL_EXECUTION,
              /* statement id */ 0),
   Open_tables_state(refresh_version), rli_fake(0),
   lock_id(&main_lock_id),
   user_time(0), in_sub_stmt(0),
   binlog_table_maps(0), binlog_flags(0UL),
   arg_of_last_insert_id_function(false),
   first_successful_insert_id_in_prev_stmt(0),
   first_successful_insert_id_in_prev_stmt_for_binlog(0),
   first_successful_insert_id_in_cur_stmt(0),
   stmt_depends_on_first_successful_insert_id_in_prev_stmt(false),
   global_read_lock(0),
   is_fatal_error(0),
   transaction_rollback_request(0),
   is_fatal_sub_stmt_error(0),
   rand_used(0),
   time_zone_used(0),
   in_lock_tables(0),
   bootstrap(0),
   derived_tables_processing(false),
   m_lip(NULL)
{
  ulong tmp;

  /*
    Pass nominal parameters to init_alloc_root only to ensure that
    the destructor works OK in case of an error. The main_mem_root
    will be re-initialized in init_for_queries().
  */
  init_sql_alloc(&main_mem_root, ALLOC_ROOT_MIN_BLOCK_SIZE, 0);
  stmt_arena= this;
  thread_stack= 0;
  catalog= (char*)"std"; // the only catalog we have for now
  main_security_ctx.init();
  security_ctx= &main_security_ctx;
  some_tables_deleted=no_errors=password= 0;
  query_start_used= 0;
  count_cuted_fields= CHECK_FIELD_IGNORE;
  killed= NOT_KILLED;
  col_access=0;
  is_slave_error= thread_specific_used= false;
  hash_clear(&handler_tables_hash);
  tmp_table=0;
  used_tables=0;
  cuted_fields= sent_row_count= row_count= 0L;
  limit_found_rows= 0;
  row_count_func= -1;
  statement_id_counter= 0UL;
  // Must be reset to handle error with THD's created for init of mysqld
  lex->current_select= 0;
  start_time=(time_t) 0;
  start_utime= 0L;
  utime_after_lock= 0L;
  current_linfo =  0;
  slave_thread = 0;
  memset(&variables, 0, sizeof(variables));
  thread_id= 0;
  one_shot_set= 0;
  file_id = 0;
  query_id= 0;
  warn_id= 0;
  db_charset= global_system_variables.collation_database;
  memset(ha_data, 0, sizeof(ha_data));
  mysys_var=0;
  binlog_evt_union.do_union= false;
  enable_slow_log= 0;
  dbug_sentry=THD_SENTRY_MAGIC;
  net.vio=0;
  client_capabilities= 0;                       // minimalistic client
  system_thread= NON_SYSTEM_THREAD;
  cleanup_done= abort_on_warning= no_warnings_for_error= 0;
  peer_port= 0;					// For SHOW PROCESSLIST
  transaction.m_pending_rows_event= 0;
  transaction.on= 1;
#ifdef SIGNAL_WITH_VIO_CLOSE
  active_vio = 0;
#endif
  pthread_mutex_init(&LOCK_delete, MY_MUTEX_INIT_FAST);

  /* Variables with default values */
  proc_info="login";
  where= THD::DEFAULT_WHERE;
  server_id = ::server_id;
  slave_net = 0;
  command=COM_CONNECT;
  *scramble= '\0';

  init();
  /* Initialize sub structures */
  init_sql_alloc(&warn_root, WARN_ALLOC_BLOCK_SIZE, WARN_ALLOC_PREALLOC_SIZE);
  user_connect=(USER_CONN *)0;
  hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
	    (hash_get_key) get_var_key,
	    (hash_free_key) free_user_var, 0);

  /* For user vars replication*/
  if (opt_bin_log)
    my_init_dynamic_array(&user_var_events,
			  sizeof(BINLOG_USER_VAR_EVENT *), 16, 16);
  else
    memset(&user_var_events, 0, sizeof(user_var_events));

  /* Protocol */
  protocol= &protocol_text;			// Default protocol
  protocol_text.init(this);

  tablespace_op= false;
  tmp= sql_rnd();
  randominit(&rand, tmp + (ulong) &rand, tmp + (ulong) ::global_query_id);
  substitute_null_with_insert_id = false;
  thr_lock_info_init(&lock_info); /* safety: will be reset after start */
  thr_lock_owner_init(&main_lock_id, &lock_info);

  m_internal_handler= NULL;
}


void THD::push_internal_handler(Internal_error_handler *handler)
{
  /*
    TODO: The current implementation is limited to 1 handler at a time only.
    THD and sp_rcontext need to be modified to use a common handler stack.
  */
  assert(m_internal_handler == NULL);
  m_internal_handler= handler;
}


bool THD::handle_error(uint sql_errno, const char *message,
                       DRIZZLE_ERROR::enum_warning_level level)
{
  if (m_internal_handler)
  {
    return m_internal_handler->handle_error(sql_errno, message, level, this);
  }

  return false;                                 // 'false', as per coding style
}


void THD::pop_internal_handler()
{
  assert(m_internal_handler != NULL);
  m_internal_handler= NULL;
}

extern "C"
void *thd_alloc(MYSQL_THD thd, unsigned int size)
{
  return thd->alloc(size);
}

extern "C"
void *thd_calloc(MYSQL_THD thd, unsigned int size)
{
  return thd->calloc(size);
}

extern "C"
char *thd_strdup(MYSQL_THD thd, const char *str)
{
  return thd->strdup(str);
}

extern "C"
char *thd_strmake(MYSQL_THD thd, const char *str, unsigned int size)
{
  return thd->strmake(str, size);
}

extern "C"
LEX_STRING *thd_make_lex_string(THD *thd, LEX_STRING *lex_str,
                                const char *str, unsigned int size,
                                int allocate_lex_string)
{
  return thd->make_lex_string(lex_str, str, size,
                              (bool) allocate_lex_string);
}

extern "C"
void *thd_memdup(MYSQL_THD thd, const void* str, unsigned int size)
{
  return thd->memdup(str, size);
}

extern "C"
void thd_get_xid(const MYSQL_THD thd, MYSQL_XID *xid)
{
  *xid = *(MYSQL_XID *) &thd->transaction.xid_state.xid;
}

/*
  Init common variables that has to be reset on start and on change_user
*/

void THD::init(void)
{
  pthread_mutex_lock(&LOCK_global_system_variables);
  plugin_thdvar_init(this);
  variables.time_format= date_time_format_copy((THD*) 0,
					       variables.time_format);
  variables.date_format= date_time_format_copy((THD*) 0,
					       variables.date_format);
  variables.datetime_format= date_time_format_copy((THD*) 0,
						   variables.datetime_format);
  /*
    variables= global_system_variables above has reset
    variables.pseudo_thread_id to 0. We need to correct it here to
    avoid temporary tables replication failure.
  */
  variables.pseudo_thread_id= thread_id;
  pthread_mutex_unlock(&LOCK_global_system_variables);
  server_status= SERVER_STATUS_AUTOCOMMIT;
  options= thd_startup_options;

  if (variables.max_join_size == HA_POS_ERROR)
    options |= OPTION_BIG_SELECTS;
  else
    options &= ~OPTION_BIG_SELECTS;

  transaction.all.modified_non_trans_table= transaction.stmt.modified_non_trans_table= false;
  open_options=ha_open_options;
  update_lock_default= (variables.low_priority_updates ?
			TL_WRITE_LOW_PRIORITY :
			TL_WRITE);
  session_tx_isolation= (enum_tx_isolation) variables.tx_isolation;
  warn_list.empty();
  memset(warn_count, 0, sizeof(warn_count));
  total_warn_count= 0;
  update_charset();
  reset_current_stmt_binlog_row_based();
  memset(&status_var, 0, sizeof(status_var));
}


/*
  Init THD for query processing.
  This has to be called once before we call mysql_parse.
  See also comments in sql_class.h.
*/

void THD::init_for_queries()
{
  set_time(); 
  ha_enable_transaction(this,true);

  reset_root_defaults(mem_root, variables.query_alloc_block_size,
                      variables.query_prealloc_size);
  reset_root_defaults(&transaction.mem_root,
                      variables.trans_alloc_block_size,
                      variables.trans_prealloc_size);
  transaction.xid_state.xid.null();
  transaction.xid_state.in_thd=1;
}


/* Do operations that may take a long time */

void THD::cleanup(void)
{
  assert(cleanup_done == 0);

  killed= KILL_CONNECTION;
#ifdef ENABLE_WHEN_BINLOG_WILL_BE_ABLE_TO_PREPARE
  if (transaction.xid_state.xa_state == XA_PREPARED)
  {
#error xid_state in the cache should be replaced by the allocated value
  }
#endif
  {
    ha_rollback(this);
    xid_cache_delete(&transaction.xid_state);
  }
  if (locked_tables)
  {
    lock=locked_tables; locked_tables=0;
    close_thread_tables(this);
  }
  mysql_ha_cleanup(this);
  delete_dynamic(&user_var_events);
  hash_free(&user_vars);
  close_temporary_tables(this);
  my_free((char*) variables.time_format, MYF(MY_ALLOW_ZERO_PTR));
  my_free((char*) variables.date_format, MYF(MY_ALLOW_ZERO_PTR));
  my_free((char*) variables.datetime_format, MYF(MY_ALLOW_ZERO_PTR));
  
  if (global_read_lock)
    unlock_global_read_lock(this);

  cleanup_done=1;
  return;
}

THD::~THD()
{
  THD_CHECK_SENTRY(this);
  /* Ensure that no one is using THD */
  pthread_mutex_lock(&LOCK_delete);
  pthread_mutex_unlock(&LOCK_delete);
  add_to_status(&global_status_var, &status_var);

  /* Close connection */
  if (net.vio)
  {
    vio_delete(net.vio);
    net_end(&net);
  }
  if (!cleanup_done)
    cleanup();

  ha_close_connection(this);
  plugin_thdvar_cleanup(this);

  main_security_ctx.destroy();
  safeFree(db);
  free_root(&warn_root,MYF(0));
  free_root(&transaction.mem_root,MYF(0));
  mysys_var=0;					// Safety (shouldn't be needed)
  pthread_mutex_destroy(&LOCK_delete);
  dbug_sentry= THD_SENTRY_GONE;
  if (rli_fake)
  {
    delete rli_fake;
    rli_fake= NULL;
  }
  
  free_root(&main_mem_root, MYF(0));
  return;
}


/*
  Add all status variables to another status variable array

  SYNOPSIS
   add_to_status()
   to_var       add to this array
   from_var     from this array

  NOTES
    This function assumes that all variables are long/ulong.
    If this assumption will change, then we have to explictely add
    the other variables after the while loop
*/

void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var)
{
  ulong *end= (ulong*) ((uchar*) to_var +
                        offsetof(STATUS_VAR, last_system_status_var) +
			sizeof(ulong));
  ulong *to= (ulong*) to_var, *from= (ulong*) from_var;

  while (to != end)
    *(to++)+= *(from++);
}

/*
  Add the difference between two status variable arrays to another one.

  SYNOPSIS
    add_diff_to_status
    to_var       add to this array
    from_var     from this array
    dec_var      minus this array
  
  NOTE
    This function assumes that all variables are long/ulong.
*/

void add_diff_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var,
                        STATUS_VAR *dec_var)
{
  ulong *end= (ulong*) ((uchar*) to_var + offsetof(STATUS_VAR,
						  last_system_status_var) +
			sizeof(ulong));
  ulong *to= (ulong*) to_var, *from= (ulong*) from_var, *dec= (ulong*) dec_var;

  while (to != end)
    *(to++)+= *(from++) - *(dec++);
}


void THD::awake(THD::killed_state state_to_set)
{
  THD_CHECK_SENTRY(this);
  safe_mutex_assert_owner(&LOCK_delete); 

  killed= state_to_set;
  if (state_to_set != THD::KILL_QUERY)
  {
    thr_alarm_kill(thread_id);
    if (!slave_thread)
      thread_scheduler.post_kill_notification(this);
#ifdef SIGNAL_WITH_VIO_CLOSE
    if (this != current_thd)
    {
      /*
        In addition to a signal, let's close the socket of the thread that
        is being killed. This is to make sure it does not block if the
        signal is lost. This needs to be done only on platforms where
        signals are not a reliable interruption mechanism.

        If we're killing ourselves, we know that we're not blocked, so this
        hack is not used.
      */

      close_active_vio();
    }
#endif    
  }
  if (mysys_var)
  {
    pthread_mutex_lock(&mysys_var->mutex);
    if (!system_thread)		// Don't abort locks
      mysys_var->abort=1;
    /*
      This broadcast could be up in the air if the victim thread
      exits the cond in the time between read and broadcast, but that is
      ok since all we want to do is to make the victim thread get out
      of waiting on current_cond.
      If we see a non-zero current_cond: it cannot be an old value (because
      then exit_cond() should have run and it can't because we have mutex); so
      it is the true value but maybe current_mutex is not yet non-zero (we're
      in the middle of enter_cond() and there is a "memory order
      inversion"). So we test the mutex too to not lock 0.

      Note that there is a small chance we fail to kill. If victim has locked
      current_mutex, but hasn't yet entered enter_cond() (which means that
      current_cond and current_mutex are 0), then the victim will not get
      a signal and it may wait "forever" on the cond (until
      we issue a second KILL or the status it's waiting for happens).
      It's true that we have set its thd->killed but it may not
      see it immediately and so may have time to reach the cond_wait().
    */
    if (mysys_var->current_cond && mysys_var->current_mutex)
    {
      pthread_mutex_lock(mysys_var->current_mutex);
      pthread_cond_broadcast(mysys_var->current_cond);
      pthread_mutex_unlock(mysys_var->current_mutex);
    }
    pthread_mutex_unlock(&mysys_var->mutex);
  }
  return;
}

/*
  Remember the location of thread info, the structure needed for
  sql_alloc() and the structure for the net buffer
*/

bool THD::store_globals()
{
  /*
    Assert that thread_stack is initialized: it's necessary to be able
    to track stack overrun.
  */
  assert(thread_stack);

  if (my_pthread_setspecific_ptr(THR_THD,  this) ||
      my_pthread_setspecific_ptr(THR_MALLOC, &mem_root))
    return 1;
  mysys_var=my_thread_var;
  /*
    Let mysqld define the thread id (not mysys)
    This allows us to move THD to different threads if needed.
  */
  mysys_var->id= thread_id;
  real_id= pthread_self();                      // For debugging

  /*
    We have to call thr_lock_info_init() again here as THD may have been
    created in another thread
  */
  thr_lock_info_init(&lock_info);
  return 0;
}


/*
  Cleanup after query.

  SYNOPSIS
    THD::cleanup_after_query()

  DESCRIPTION
    This function is used to reset thread data to its default state.

  NOTE
    This function is not suitable for setting thread data to some
    non-default values, as there is only one replication thread, so
    different master threads may overwrite data of each other on
    slave.
*/

void THD::cleanup_after_query()
{
  /*
    Reset rand_used so that detection of calls to rand() will save random 
    seeds if needed by the slave.

    Do not reset rand_used if inside a stored function or trigger because 
    only the call to these operations is logged. Thus only the calling 
    statement needs to detect rand() calls made by its substatements. These
    substatements must not set rand_used to 0 because it would remove the
    detection of rand() by the calling statement. 
  */
  if (!in_sub_stmt) /* stored functions and triggers are a special case */
  {
    /* Forget those values, for next binlogger: */
    stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;
    auto_inc_intervals_in_cur_stmt_for_binlog.empty();
    rand_used= 0;
  }
  if (first_successful_insert_id_in_cur_stmt > 0)
  {
    /* set what LAST_INSERT_ID() will return */
    first_successful_insert_id_in_prev_stmt= 
      first_successful_insert_id_in_cur_stmt;
    first_successful_insert_id_in_cur_stmt= 0;
    substitute_null_with_insert_id= true;
  }
  arg_of_last_insert_id_function= 0;
  /* Free Items that were created during this execution */
  free_items();
  /* Reset where. */
  where= THD::DEFAULT_WHERE;
}


/**
  Create a LEX_STRING in this connection.

  @param lex_str  pointer to LEX_STRING object to be initialized
  @param str      initializer to be copied into lex_str
  @param length   length of str, in bytes
  @param allocate_lex_string  if true, allocate new LEX_STRING object,
                              instead of using lex_str value
  @return  NULL on failure, or pointer to the LEX_STRING object
*/
LEX_STRING *THD::make_lex_string(LEX_STRING *lex_str,
                                 const char* str, uint length,
                                 bool allocate_lex_string)
{
  if (allocate_lex_string)
    if (!(lex_str= (LEX_STRING *)alloc(sizeof(LEX_STRING))))
      return 0;
  if (!(lex_str->str= strmake_root(mem_root, str, length)))
    return 0;
  lex_str->length= length;
  return lex_str;
}


/*
  Convert a string to another character set

  SYNOPSIS
    convert_string()
    to				Store new allocated string here
    to_cs			New character set for allocated string
    from			String to convert
    from_length			Length of string to convert
    from_cs			Original character set

  NOTES
    to will be 0-terminated to make it easy to pass to system funcs

  RETURN
    0	ok
    1	End of memory.
        In this case to->str will point to 0 and to->length will be 0.
*/

bool THD::convert_string(LEX_STRING *to, CHARSET_INFO *to_cs,
			 const char *from, uint from_length,
			 CHARSET_INFO *from_cs)
{
  size_t new_length= to_cs->mbmaxlen * from_length;
  uint dummy_errors;
  if (!(to->str= (char*) alloc(new_length+1)))
  {
    to->length= 0;				// Safety fix
    return(1);				// EOM
  }
  to->length= copy_and_convert((char*) to->str, new_length, to_cs,
			       from, from_length, from_cs, &dummy_errors);
  to->str[to->length]=0;			// Safety
  return(0);
}


/*
  Convert string from source character set to target character set inplace.

  SYNOPSIS
    THD::convert_string

  DESCRIPTION
    Convert string using convert_buffer - buffer for character set 
    conversion shared between all protocols.

  RETURN
    0   ok
   !0   out of memory
*/

bool THD::convert_string(String *s, CHARSET_INFO *from_cs, CHARSET_INFO *to_cs)
{
  uint dummy_errors;
  if (convert_buffer.copy(s->ptr(), s->length(), from_cs, to_cs, &dummy_errors))
    return true;
  /* If convert_buffer >> s copying is more efficient long term */
  if (convert_buffer.alloced_length() >= convert_buffer.length() * 2 ||
      !s->is_alloced())
  {
    return s->copy(convert_buffer);
  }
  s->swap(convert_buffer);
  return false;
}


/*
  Update some cache variables when character set changes
*/

void THD::update_charset()
{
  uint32_t not_used;
  charset_is_system_charset= !String::needs_conversion(0,charset(),
                                                       system_charset_info,
                                                       &not_used);
  charset_is_collation_connection= 
    !String::needs_conversion(0,charset(),variables.collation_connection,
                              &not_used);
  charset_is_character_set_filesystem= 
    !String::needs_conversion(0, charset(),
                              variables.character_set_filesystem, &not_used);
}


/* routings to adding tables to list of changed in transaction tables */

inline static void list_include(CHANGED_TABLE_LIST** prev,
				CHANGED_TABLE_LIST* curr,
				CHANGED_TABLE_LIST* new_table)
{
  if (new_table)
  {
    *prev = new_table;
    (*prev)->next = curr;
  }
}

/* add table to list of changed in transaction tables */

void THD::add_changed_table(TABLE *table)
{
  assert((options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) &&
	      table->file->has_transactions());
  add_changed_table(table->s->table_cache_key.str,
                    (long) table->s->table_cache_key.length);
  return;
}


void THD::add_changed_table(const char *key, long key_length)
{
  CHANGED_TABLE_LIST **prev_changed = &transaction.changed_tables;
  CHANGED_TABLE_LIST *curr = transaction.changed_tables;

  for (; curr; prev_changed = &(curr->next), curr = curr->next)
  {
    int cmp =  (long)curr->key_length - (long)key_length;
    if (cmp < 0)
    {
      list_include(prev_changed, curr, changed_table_dup(key, key_length));
      return;
    }
    else if (cmp == 0)
    {
      cmp = memcmp(curr->key, key, curr->key_length);
      if (cmp < 0)
      {
	list_include(prev_changed, curr, changed_table_dup(key, key_length));
	return;
      }
      else if (cmp == 0)
      {
	return;
      }
    }
  }
  *prev_changed = changed_table_dup(key, key_length);
  return;
}


CHANGED_TABLE_LIST* THD::changed_table_dup(const char *key, long key_length)
{
  CHANGED_TABLE_LIST* new_table = 
    (CHANGED_TABLE_LIST*) trans_alloc(ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST))+
				      key_length + 1);
  if (!new_table)
  {
    my_error(EE_OUTOFMEMORY, MYF(ME_BELL),
             ALIGN_SIZE(sizeof(TABLE_LIST)) + key_length + 1);
    killed= KILL_CONNECTION;
    return 0;
  }

  new_table->key= ((char*)new_table)+ ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST));
  new_table->next = 0;
  new_table->key_length = key_length;
  ::memcpy(new_table->key, key, key_length);
  return new_table;
}


int THD::send_explain_fields(select_result *result)
{
  List<Item> field_list;
  Item *item;
  CHARSET_INFO *cs= system_charset_info;
  field_list.push_back(new Item_return_int("id",3, DRIZZLE_TYPE_LONGLONG));
  field_list.push_back(new Item_empty_string("select_type", 19, cs));
  field_list.push_back(item= new Item_empty_string("table", NAME_CHAR_LEN, cs));
  item->maybe_null= 1;
  field_list.push_back(item= new Item_empty_string("type", 10, cs));
  item->maybe_null= 1;
  field_list.push_back(item=new Item_empty_string("possible_keys",
						  NAME_CHAR_LEN*MAX_KEY, cs));
  item->maybe_null=1;
  field_list.push_back(item=new Item_empty_string("key", NAME_CHAR_LEN, cs));
  item->maybe_null=1;
  field_list.push_back(item=
    new Item_empty_string("key_len",
                          MAX_KEY *
                          (MAX_KEY_LENGTH_DECIMAL_WIDTH + 1 /* for comma */),
                          cs));
  item->maybe_null=1;
  field_list.push_back(item=new Item_empty_string("ref",
                                                  NAME_CHAR_LEN*MAX_REF_PARTS,
                                                  cs));
  item->maybe_null=1;
  field_list.push_back(item= new Item_return_int("rows", 10,
                                                 DRIZZLE_TYPE_LONGLONG));
  if (lex->describe & DESCRIBE_EXTENDED)
  {
    field_list.push_back(item= new Item_float("filtered", 0.1234, 2, 4));
    item->maybe_null=1;
  }
  item->maybe_null= 1;
  field_list.push_back(new Item_empty_string("Extra", 255, cs));
  return (result->send_fields(field_list,
                              Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF));
}

#ifdef SIGNAL_WITH_VIO_CLOSE
void THD::close_active_vio()
{
  safe_mutex_assert_owner(&LOCK_delete); 
  if (active_vio)
  {
    vio_close(active_vio);
    active_vio = 0;
  }
  return;
}
#endif


struct Item_change_record: public ilink
{
  Item **place;
  Item *old_value;
  /* Placement new was hidden by `new' in ilink (TODO: check): */
  static void *operator new(size_t size __attribute__((unused)),
                            void *mem)
    { return mem; }
  static void operator delete(void *ptr __attribute__((unused)),
                              size_t size __attribute__((unused)))
    {}
  static void operator delete(void *ptr __attribute__((unused)),
                              void *mem __attribute__((unused)))
    { /* never called */ }
};


/*
  Register an item tree tree transformation, performed by the query
  optimizer. We need a pointer to runtime_memroot because it may be !=
  thd->mem_root (due to possible set_n_backup_active_arena called for thd).
*/

void THD::nocheck_register_item_tree_change(Item **place, Item *old_value,
                                            MEM_ROOT *runtime_memroot)
{
  Item_change_record *change;
  /*
    Now we use one node per change, which adds some memory overhead,
    but still is rather fast as we use alloc_root for allocations.
    A list of item tree changes of an average query should be short.
  */
  void *change_mem= alloc_root(runtime_memroot, sizeof(*change));
  if (change_mem == 0)
  {
    /*
      OOM, thd->fatal_error() is called by the error handler of the
      memroot. Just return.
    */
    return;
  }
  change= new (change_mem) Item_change_record;
  change->place= place;
  change->old_value= old_value;
  change_list.append(change);
}


void THD::rollback_item_tree_changes()
{
  I_List_iterator<Item_change_record> it(change_list);
  Item_change_record *change;

  while ((change= it++))
    *change->place= change->old_value;
  /* We can forget about changes memory: it's allocated in runtime memroot */
  change_list.empty();
  return;
}


/**
  Check that the endpoint is still available.
*/

bool THD::vio_is_connected()
{
  uint bytes= 0;

  /* End of input is signaled by poll if the socket is aborted. */
  if (vio_poll_read(net.vio, 0))
    return true;

  /* Socket is aborted if signaled but no data is available. */
  if (vio_peek_read(net.vio, &bytes))
    return true;

  return bytes ? true : false;
}


/*****************************************************************************
** Functions to provide a interface to select results
*****************************************************************************/

select_result::select_result()
{
  thd=current_thd;
}

void select_result::send_error(uint errcode,const char *err)
{
  my_message(errcode, err, MYF(0));
}


void select_result::cleanup()
{
  /* do nothing */
}

bool select_result::check_simple_select() const
{
  my_error(ER_SP_BAD_CURSOR_QUERY, MYF(0));
  return true;
}


static String default_line_term("\n",default_charset_info);
static String default_escaped("\\",default_charset_info);
static String default_field_term("\t",default_charset_info);
static String default_xml_row_term("<row>", default_charset_info);

sql_exchange::sql_exchange(char *name, bool flag,
                           enum enum_filetype filetype_arg)
  :file_name(name), opt_enclosed(0), dumpfile(flag), skip_lines(0)
{
  filetype= filetype_arg;
  field_term= &default_field_term;
  enclosed=   line_start= &my_empty_string;
  line_term=  filetype == FILETYPE_CSV ?
              &default_line_term : &default_xml_row_term;
  escaped=    &default_escaped;
  cs= NULL;
}

bool select_send::send_fields(List<Item> &list, uint flags)
{
  bool res;
  if (!(res= thd->protocol->send_fields(&list, flags)))
    is_result_set_started= 1;
  return res;
}

void select_send::abort()
{
  return;
}


/** 
  Cleanup an instance of this class for re-use
  at next execution of a prepared statement/
  stored procedure statement.
*/

void select_send::cleanup()
{
  is_result_set_started= false;
}

/* Send data to client. Returns 0 if ok */

bool select_send::send_data(List<Item> &items)
{
  if (unit->offset_limit_cnt)
  {						// using limit offset,count
    unit->offset_limit_cnt--;
    return 0;
  }

  /*
    We may be passing the control from mysqld to the client: release the
    InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved
    by thd
  */
  ha_release_temporary_latches(thd);

  List_iterator_fast<Item> li(items);
  Protocol *protocol= thd->protocol;
  char buff[MAX_FIELD_WIDTH];
  String buffer(buff, sizeof(buff), &my_charset_bin);

  protocol->prepare_for_resend();
  Item *item;
  while ((item=li++))
  {
    if (item->send(protocol, &buffer))
    {
      protocol->free();				// Free used buffer
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
      break;
    }
  }
  thd->sent_row_count++;
  if (thd->is_error())
  {
    protocol->remove_last_row();
    return(1);
  }
  if (thd->vio_ok())
    return(protocol->write());
  return(0);
}

bool select_send::send_eof()
{
  /* 
    We may be passing the control from mysqld to the client: release the
    InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved
    by thd 
  */
  ha_release_temporary_latches(thd);

  /* Unlock tables before sending packet to gain some speed */
  if (thd->lock)
  {
    mysql_unlock_tables(thd, thd->lock);
    thd->lock=0;
  }
  ::my_eof(thd);
  is_result_set_started= 0;
  return false;
}


/************************************************************************
  Handling writing to file
************************************************************************/

void select_to_file::send_error(uint errcode,const char *err)
{
  my_message(errcode, err, MYF(0));
  if (file > 0)
  {
    (void) end_io_cache(&cache);
    (void) my_close(file,MYF(0));
    (void) my_delete(path,MYF(0));		// Delete file on error
    file= -1;
  }
}


bool select_to_file::send_eof()
{
  int error= test(end_io_cache(&cache));
  if (my_close(file,MYF(MY_WME)))
    error= 1;
  if (!error)
  {
    /*
      In order to remember the value of affected rows for ROW_COUNT()
      function, SELECT INTO has to have an own SQLCOM.
      TODO: split from SQLCOM_SELECT
    */
    ::my_ok(thd,row_count);
  }
  file= -1;
  return error;
}


void select_to_file::cleanup()
{
  /* In case of error send_eof() may be not called: close the file here. */
  if (file >= 0)
  {
    (void) end_io_cache(&cache);
    (void) my_close(file,MYF(0));
    file= -1;
  }
  path[0]= '\0';
  row_count= 0;
}


select_to_file::~select_to_file()
{
  if (file >= 0)
  {					// This only happens in case of error
    (void) end_io_cache(&cache);
    (void) my_close(file,MYF(0));
    file= -1;
  }
}

/***************************************************************************
** Export of select to textfile
***************************************************************************/

select_export::~select_export()
{
  thd->sent_row_count=row_count;
}


/*
  Create file with IO cache

  SYNOPSIS
    create_file()
    thd			Thread handle
    path		File name
    exchange		Excange class
    cache		IO cache

  RETURN
    >= 0 	File handle
   -1		Error
*/


static File create_file(THD *thd, char *path, sql_exchange *exchange,
			IO_CACHE *cache)
{
  File file;
  uint option= MY_UNPACK_FILENAME | MY_RELATIVE_PATH;

#ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
  option|= MY_REPLACE_DIR;			// Force use of db directory
#endif

  if (!dirname_length(exchange->file_name))
  {
    strxnmov(path, FN_REFLEN-1, mysql_real_data_home, thd->db ? thd->db : "",
             NullS);
    (void) fn_format(path, exchange->file_name, path, "", option);
  }
  else
    (void) fn_format(path, exchange->file_name, mysql_real_data_home, "", option);

  if (opt_secure_file_priv &&
      strncmp(opt_secure_file_priv, path, strlen(opt_secure_file_priv)))
  {
    /* Write only allowed to dir or subdir specified by secure_file_priv */
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--secure-file-priv");
    return -1;
  }

  if (!access(path, F_OK))
  {
    my_error(ER_FILE_EXISTS_ERROR, MYF(0), exchange->file_name);
    return -1;
  }
  /* Create the file world readable */
  if ((file= my_create(path, 0666, O_WRONLY|O_EXCL, MYF(MY_WME))) < 0)
    return file;
#ifdef HAVE_FCHMOD
  (void) fchmod(file, 0666);			// Because of umask()
#else
  (void) chmod(path, 0666);
#endif
  if (init_io_cache(cache, file, 0L, WRITE_CACHE, 0L, 1, MYF(MY_WME)))
  {
    my_close(file, MYF(0));
    my_delete(path, MYF(0));  // Delete file on error, it was just created 
    return -1;
  }
  return file;
}


int
select_export::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
{
  bool blob_flag=0;
  bool string_results= false, non_string_results= false;
  unit= u;
  if ((uint) strlen(exchange->file_name) + NAME_LEN >= FN_REFLEN)
    strmake(path,exchange->file_name,FN_REFLEN-1);

  if ((file= create_file(thd, path, exchange, &cache)) < 0)
    return 1;
  /* Check if there is any blobs in data */
  {
    List_iterator_fast<Item> li(list);
    Item *item;
    while ((item=li++))
    {
      if (item->max_length >= MAX_BLOB_WIDTH)
      {
	blob_flag=1;
	break;
      }
      if (item->result_type() == STRING_RESULT)
        string_results= true;
      else
        non_string_results= true;
    }
  }
  field_term_length=exchange->field_term->length();
  field_term_char= field_term_length ?
                   (int) (uchar) (*exchange->field_term)[0] : INT_MAX;
  if (!exchange->line_term->length())
    exchange->line_term=exchange->field_term;	// Use this if it exists
  field_sep_char= (exchange->enclosed->length() ?
                  (int) (uchar) (*exchange->enclosed)[0] : field_term_char);
  escape_char=	(exchange->escaped->length() ?
                (int) (uchar) (*exchange->escaped)[0] : -1);
  is_ambiguous_field_sep= test(strchr(ESCAPE_CHARS, field_sep_char));
  is_unsafe_field_sep= test(strchr(NUMERIC_CHARS, field_sep_char));
  line_sep_char= (exchange->line_term->length() ?
                 (int) (uchar) (*exchange->line_term)[0] : INT_MAX);
  if (!field_term_length)
    exchange->opt_enclosed=0;
  if (!exchange->enclosed->length())
    exchange->opt_enclosed=1;			// A little quicker loop
  fixed_row_size= (!field_term_length && !exchange->enclosed->length() &&
		   !blob_flag);
  if ((is_ambiguous_field_sep && exchange->enclosed->is_empty() &&
       (string_results || is_unsafe_field_sep)) ||
      (exchange->opt_enclosed && non_string_results &&
       field_term_length && strchr(NUMERIC_CHARS, field_term_char)))
  {
    push_warning(thd, DRIZZLE_ERROR::WARN_LEVEL_WARN,
                 ER_AMBIGUOUS_FIELD_TERM, ER(ER_AMBIGUOUS_FIELD_TERM));
    is_ambiguous_field_term= true;
  }
  else
    is_ambiguous_field_term= false;

  return 0;
}


#define NEED_ESCAPING(x) ((int) (uchar) (x) == escape_char    || \
                          (enclosed ? (int) (uchar) (x) == field_sep_char      \
                                    : (int) (uchar) (x) == field_term_char) || \
                          (int) (uchar) (x) == line_sep_char  || \
                          !(x))

bool select_export::send_data(List<Item> &items)
{
  char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH];
  bool space_inited=0;
  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
  tmp.length(0);

  if (unit->offset_limit_cnt)
  {						// using limit offset,count
    unit->offset_limit_cnt--;
    return(0);
  }
  row_count++;
  Item *item;
  uint used_length=0,items_left=items.elements;
  List_iterator_fast<Item> li(items);

  if (my_b_write(&cache,(uchar*) exchange->line_start->ptr(),
		 exchange->line_start->length()))
    goto err;
  while ((item=li++))
  {
    Item_result result_type=item->result_type();
    bool enclosed = (exchange->enclosed->length() &&
                     (!exchange->opt_enclosed || result_type == STRING_RESULT));
    res=item->str_result(&tmp);
    if (res && enclosed)
    {
      if (my_b_write(&cache,(uchar*) exchange->enclosed->ptr(),
		     exchange->enclosed->length()))
	goto err;
    }
    if (!res)
    {						// NULL
      if (!fixed_row_size)
      {
	if (escape_char != -1)			// Use \N syntax
	{
	  null_buff[0]=escape_char;
	  null_buff[1]='N';
	  if (my_b_write(&cache,(uchar*) null_buff,2))
	    goto err;
	}
	else if (my_b_write(&cache,(uchar*) "NULL",4))
	  goto err;
      }
      else
      {
	used_length=0;				// Fill with space
      }
    }
    else
    {
      if (fixed_row_size)
	used_length=min(res->length(),item->max_length);
      else
	used_length=res->length();
      if ((result_type == STRING_RESULT || is_unsafe_field_sep) &&
           escape_char != -1)
      {
        char *pos, *start, *end;
        CHARSET_INFO *res_charset= res->charset();
        CHARSET_INFO *character_set_client= thd->variables.
                                            character_set_client;
        bool check_second_byte= (res_charset == &my_charset_bin) &&
                                 character_set_client->
                                 escape_with_backslash_is_dangerous;
        assert(character_set_client->mbmaxlen == 2 ||
                    !character_set_client->escape_with_backslash_is_dangerous);
	for (start=pos=(char*) res->ptr(),end=pos+used_length ;
	     pos != end ;
	     pos++)
	{
#ifdef USE_MB
	  if (use_mb(res_charset))
	  {
	    int l;
	    if ((l=my_ismbchar(res_charset, pos, end)))
	    {
	      pos += l-1;
	      continue;
	    }
	  }
#endif

          /*
            Special case when dumping BINARY/VARBINARY/BLOB values
            for the clients with character sets big5, cp932, gbk and sjis,
            which can have the escape character (0x5C "\" by default)
            as the second byte of a multi-byte sequence.
            
            If
            - pos[0] is a valid multi-byte head (e.g 0xEE) and
            - pos[1] is 0x00, which will be escaped as "\0",
            
            then we'll get "0xEE + 0x5C + 0x30" in the output file.
            
            If this file is later loaded using this sequence of commands:
            
            mysql> create table t1 (a varchar(128)) character set big5;
            mysql> LOAD DATA INFILE 'dump.txt' INTO TABLE t1;
            
            then 0x5C will be misinterpreted as the second byte
            of a multi-byte character "0xEE + 0x5C", instead of
            escape character for 0x00.
            
            To avoid this confusion, we'll escape the multi-byte
            head character too, so the sequence "0xEE + 0x00" will be
            dumped as "0x5C + 0xEE + 0x5C + 0x30".
            
            Note, in the condition below we only check if
            mbcharlen is equal to 2, because there are no
            character sets with mbmaxlen longer than 2
            and with escape_with_backslash_is_dangerous set.
            assert before the loop makes that sure.
          */

          if ((NEED_ESCAPING(*pos) ||
               (check_second_byte &&
                my_mbcharlen(character_set_client, (uchar) *pos) == 2 &&
                pos + 1 < end &&
                NEED_ESCAPING(pos[1]))) &&
              /*
               Don't escape field_term_char by doubling - doubling is only
               valid for ENCLOSED BY characters:
              */
              (enclosed || !is_ambiguous_field_term ||
               (int) (uchar) *pos != field_term_char))
          {
	    char tmp_buff[2];
            tmp_buff[0]= ((int) (uchar) *pos == field_sep_char &&
                          is_ambiguous_field_sep) ?
                          field_sep_char : escape_char;
	    tmp_buff[1]= *pos ? *pos : '0';
	    if (my_b_write(&cache,(uchar*) start,(uint) (pos-start)) ||
		my_b_write(&cache,(uchar*) tmp_buff,2))
	      goto err;
	    start=pos+1;
	  }
	}
	if (my_b_write(&cache,(uchar*) start,(uint) (pos-start)))
	  goto err;
      }
      else if (my_b_write(&cache,(uchar*) res->ptr(),used_length))
	goto err;
    }
    if (fixed_row_size)
    {						// Fill with space
      if (item->max_length > used_length)
      {
	/* QQ:  Fix by adding a my_b_fill() function */
	if (!space_inited)
	{
	  space_inited=1;
	  memset(space, ' ', sizeof(space));
	}
	uint length=item->max_length-used_length;
	for (; length > sizeof(space) ; length-=sizeof(space))
	{
	  if (my_b_write(&cache,(uchar*) space,sizeof(space)))
	    goto err;
	}
	if (my_b_write(&cache,(uchar*) space,length))
	  goto err;
      }
    }
    if (res && enclosed)
    {
      if (my_b_write(&cache, (uchar*) exchange->enclosed->ptr(),
                     exchange->enclosed->length()))
        goto err;
    }
    if (--items_left)
    {
      if (my_b_write(&cache, (uchar*) exchange->field_term->ptr(),
                     field_term_length))
        goto err;
    }
  }
  if (my_b_write(&cache,(uchar*) exchange->line_term->ptr(),
		 exchange->line_term->length()))
    goto err;
  return(0);
err:
  return(1);
}


/***************************************************************************
** Dump  of select to a binary file
***************************************************************************/


int
select_dump::prepare(List<Item> &list __attribute__((unused)),
		     SELECT_LEX_UNIT *u)
{
  unit= u;
  return (int) ((file= create_file(thd, path, exchange, &cache)) < 0);
}


bool select_dump::send_data(List<Item> &items)
{
  List_iterator_fast<Item> li(items);
  char buff[MAX_FIELD_WIDTH];
  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
  tmp.length(0);
  Item *item;

  if (unit->offset_limit_cnt)
  {						// using limit offset,count
    unit->offset_limit_cnt--;
    return(0);
  }
  if (row_count++ > 1) 
  {
    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
    goto err;
  }
  while ((item=li++))
  {
    res=item->str_result(&tmp);
    if (!res)					// If NULL
    {
      if (my_b_write(&cache,(uchar*) "",1))
	goto err;
    }
    else if (my_b_write(&cache,(uchar*) res->ptr(),res->length()))
    {
      my_error(ER_ERROR_ON_WRITE, MYF(0), path, my_errno);
      goto err;
    }
  }
  return(0);
err:
  return(1);
}


select_subselect::select_subselect(Item_subselect *item_arg)
{
  item= item_arg;
}


bool select_singlerow_subselect::send_data(List<Item> &items)
{
  Item_singlerow_subselect *it= (Item_singlerow_subselect *)item;
  if (it->assigned())
  {
    my_message(ER_SUBQUERY_NO_1_ROW, ER(ER_SUBQUERY_NO_1_ROW), MYF(0));
    return(1);
  }
  if (unit->offset_limit_cnt)
  {				          // Using limit offset,count
    unit->offset_limit_cnt--;
    return(0);
  }
  List_iterator_fast<Item> li(items);
  Item *val_item;
  for (uint i= 0; (val_item= li++); i++)
    it->store(i, val_item);
  it->assigned(1);
  return(0);
}


void select_max_min_finder_subselect::cleanup()
{
  cache= 0;
  return;
}


bool select_max_min_finder_subselect::send_data(List<Item> &items)
{
  Item_maxmin_subselect *it= (Item_maxmin_subselect *)item;
  List_iterator_fast<Item> li(items);
  Item *val_item= li++;
  it->register_value();
  if (it->assigned())
  {
    cache->store(val_item);
    if ((this->*op)())
      it->store(0, cache);
  }
  else
  {
    if (!cache)
    {
      cache= Item_cache::get_cache(val_item);
      switch (val_item->result_type())
      {
      case REAL_RESULT:
	op= &select_max_min_finder_subselect::cmp_real;
	break;
      case INT_RESULT:
	op= &select_max_min_finder_subselect::cmp_int;
	break;
      case STRING_RESULT:
	op= &select_max_min_finder_subselect::cmp_str;
	break;
      case DECIMAL_RESULT:
        op= &select_max_min_finder_subselect::cmp_decimal;
        break;
      case ROW_RESULT:
        // This case should never be choosen
	assert(0);
	op= 0;
      }
    }
    cache->store(val_item);
    it->store(0, cache);
  }
  it->assigned(1);
  return(0);
}

bool select_max_min_finder_subselect::cmp_real()
{
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
  double val1= cache->val_real(), val2= maxmin->val_real();
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       val1 > val2);
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     val1 < val2);
}

bool select_max_min_finder_subselect::cmp_int()
{
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
  int64_t val1= cache->val_int(), val2= maxmin->val_int();
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       val1 > val2);
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     val1 < val2);
}

bool select_max_min_finder_subselect::cmp_decimal()
{
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
  my_decimal cval, *cvalue= cache->val_decimal(&cval);
  my_decimal mval, *mvalue= maxmin->val_decimal(&mval);
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       my_decimal_cmp(cvalue, mvalue) > 0) ;
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     my_decimal_cmp(cvalue,mvalue) < 0);
}

bool select_max_min_finder_subselect::cmp_str()
{
  String *val1, *val2, buf1, buf2;
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
  /*
    as far as both operand is Item_cache buf1 & buf2 will not be used,
    but added for safety
  */
  val1= cache->val_str(&buf1);
  val2= maxmin->val_str(&buf1);
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       sortcmp(val1, val2, cache->collation.collation) > 0) ;
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     sortcmp(val1, val2, cache->collation.collation) < 0);
}

bool select_exists_subselect::send_data(List<Item> &items __attribute__((unused)))
{
  Item_exists_subselect *it= (Item_exists_subselect *)item;
  if (unit->offset_limit_cnt)
  { // Using limit offset,count
    unit->offset_limit_cnt--;
    return(0);
  }
  it->value= 1;
  it->assigned(1);
  return(0);
}


/***************************************************************************
  Dump of select to variables
***************************************************************************/

int select_dumpvar::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
{
  unit= u;
  
  if (var_list.elements != list.elements)
  {
    my_message(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT,
               ER(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT), MYF(0));
    return 1;
  }               
  return 0;
}


bool select_dumpvar::check_simple_select() const
{
  my_error(ER_SP_BAD_CURSOR_SELECT, MYF(0));
  return true;
}


void select_dumpvar::cleanup()
{
  row_count= 0;
}


void Query_arena::free_items()
{
  Item *next;
  /* This works because items are allocated with sql_alloc() */
  for (; free_list; free_list= next)
  {
    next= free_list->next;
    free_list->delete_self();
  }
  /* Postcondition: free_list is 0 */
  return;
}


void Query_arena::set_query_arena(Query_arena *set)
{
  mem_root= set->mem_root;
  free_list= set->free_list;
  state= set->state;
}


void Query_arena::cleanup_stmt()
{
  assert("not implemented");
}

/*
  Statement functions
*/

Statement::Statement(LEX *lex_arg, MEM_ROOT *mem_root_arg,
                     enum enum_state state_arg, ulong id_arg)
  :Query_arena(mem_root_arg, state_arg),
  id(id_arg),
  mark_used_columns(MARK_COLUMNS_READ),
  lex(lex_arg),
  query(0),
  query_length(0),
  db(NULL),
  db_length(0)
{
  name.str= NULL;
}


void Statement::set_statement(Statement *stmt)
{
  id=             stmt->id;
  mark_used_columns=   stmt->mark_used_columns;
  lex=            stmt->lex;
  query=          stmt->query;
  query_length=   stmt->query_length;
}


void
Statement::set_n_backup_statement(Statement *stmt, Statement *backup)
{
  backup->set_statement(this);
  set_statement(stmt);
  return;
}


void Statement::restore_backup_statement(Statement *stmt, Statement *backup)
{
  stmt->set_statement(this);
  set_statement(backup);
  return;
}


void THD::end_statement()
{
  /* Cleanup SQL processing state to reuse this statement in next query. */
  lex_end(lex);
  delete lex->result;
  lex->result= 0;
  /* Note that free_list is freed in cleanup_after_query() */

  /*
    Don't free mem_root, as mem_root is freed in the end of dispatch_command
    (once for any command).
  */
}


void THD::set_n_backup_active_arena(Query_arena *set, Query_arena *backup)
{
  assert(backup->is_backup_arena == false);

  backup->set_query_arena(this);
  set_query_arena(set);
  backup->is_backup_arena= true;
  return;
}


void THD::restore_active_arena(Query_arena *set, Query_arena *backup)
{
  assert(backup->is_backup_arena);
  set->set_query_arena(this);
  set_query_arena(backup);
  backup->is_backup_arena= false;
  return;
}


bool THD::copy_db_to(char **p_db, size_t *p_db_length)
{
  if (db == NULL)
  {
    my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
    return true;
  }
  *p_db= strmake(db, db_length);
  *p_db_length= db_length;
  return false;
}


bool select_dumpvar::send_data(List<Item> &items)
{
  List_iterator_fast<my_var> var_li(var_list);
  List_iterator<Item> it(items);
  Item *item;
  my_var *mv;

  if (unit->offset_limit_cnt)
  {						// using limit offset,count
    unit->offset_limit_cnt--;
    return(0);
  }
  if (row_count++) 
  {
    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
    return(1);
  }
  while ((mv= var_li++) && (item= it++))
  {
    if (mv->local == 0)
    {
      Item_func_set_user_var *suv= new Item_func_set_user_var(mv->s, item);
      suv->fix_fields(thd, 0);
      suv->check(0);
      suv->update();
    }
  }
  return(thd->is_error());
}

bool select_dumpvar::send_eof()
{
  if (! row_count)
    push_warning(thd, DRIZZLE_ERROR::WARN_LEVEL_WARN,
                 ER_SP_FETCH_NO_DATA, ER(ER_SP_FETCH_NO_DATA));
  /*
    In order to remember the value of affected rows for ROW_COUNT()
    function, SELECT INTO has to have an own SQLCOM.
    TODO: split from SQLCOM_SELECT
  */
  ::my_ok(thd,row_count);
  return 0;
}

/****************************************************************************
  TMP_TABLE_PARAM
****************************************************************************/

void TMP_TABLE_PARAM::init()
{
  field_count= sum_func_count= func_count= hidden_field_count= 0;
  group_parts= group_length= group_null_parts= 0;
  quick_group= 1;
  table_charset= 0;
  precomputed_group_by= 0;
  bit_fields_as_long= 0;
  return;
}


void thd_increment_bytes_sent(ulong length)
{
  THD *thd=current_thd;
  if (likely(thd != 0))
  { /* current_thd==0 when close_connection() calls net_send_error() */
    thd->status_var.bytes_sent+= length;
  }
}


void thd_increment_bytes_received(ulong length)
{
  current_thd->status_var.bytes_received+= length;
}


void thd_increment_net_big_packet_count(ulong length)
{
  current_thd->status_var.net_big_packet_count+= length;
}

void THD::send_kill_message() const
{
  int err= killed_errno();
  if (err)
    my_message(err, ER(err), MYF(0));
}

void THD::set_status_var_init()
{
  memset(&status_var, 0, sizeof(status_var));
}


void Security_context::init()
{
  host= user= priv_user= ip= 0;
  host_or_ip= "connecting host";
  priv_host[0]= '\0';
}


void Security_context::destroy()
{
  // If not pointer to constant
  if (host != my_localhost)
    safeFree(host);
  safeFree(user);
  safeFree(ip);
}


void Security_context::skip_grants()
{
  /* privileges for the user are unknown everything is allowed */
  host_or_ip= (char *)"";
  priv_user= (char *)"";
  *priv_host= '\0';
}


/****************************************************************************
  Handling of open and locked tables states.

  This is used when we want to open/lock (and then close) some tables when
  we already have a set of tables open and locked. We use these methods for
  access to mysql.proc table to find definitions of stored routines.
****************************************************************************/

void THD::reset_n_backup_open_tables_state(Open_tables_state *backup)
{
  backup->set_open_tables_state(this);
  reset_open_tables_state();
  state_flags|= Open_tables_state::BACKUPS_AVAIL;
  return;
}


void THD::restore_backup_open_tables_state(Open_tables_state *backup)
{
  /*
    Before we will throw away current open tables state we want
    to be sure that it was properly cleaned up.
  */
  assert(open_tables == 0 && temporary_tables == 0 &&
              handler_tables == 0 && derived_tables == 0 &&
              lock == 0 && locked_tables == 0);
  set_open_tables_state(backup);
  return;
}

/**
  Check the killed state of a user thread
  @param thd  user thread
  @retval 0 the user thread is active
  @retval 1 the user thread has been killed
*/
extern "C" int thd_killed(const MYSQL_THD thd)
{
  return(thd->killed);
}

/**
  Return the thread id of a user thread
  @param thd user thread
  @return thread id
*/
extern "C" unsigned long thd_get_thread_id(const MYSQL_THD thd)
{
  return((unsigned long)thd->thread_id);
}


#ifdef INNODB_COMPATIBILITY_HOOKS
extern "C" struct charset_info_st *thd_charset(MYSQL_THD thd)
{
  return(thd->charset());
}

extern "C" char **thd_query(MYSQL_THD thd)
{
  return(&thd->query);
}

extern "C" int thd_slave_thread(const MYSQL_THD thd)
{
  return(thd->slave_thread);
}

extern "C" int thd_non_transactional_update(const MYSQL_THD thd)
{
  return(thd->transaction.all.modified_non_trans_table);
}

extern "C" int thd_binlog_format(const MYSQL_THD thd)
{
  return (int) thd->variables.binlog_format;
}

extern "C" void thd_mark_transaction_to_rollback(MYSQL_THD thd, bool all)
{
  mark_transaction_to_rollback(thd, all);
}
#endif // INNODB_COMPATIBILITY_HOOKS */


/**
  Mark transaction to rollback and mark error as fatal to a sub-statement.

  @param  thd   Thread handle
  @param  all   true <=> rollback main transaction.
*/

void mark_transaction_to_rollback(THD *thd, bool all)
{
  if (thd)
  {
    thd->is_fatal_sub_stmt_error= true;
    thd->transaction_rollback_request= all;
  }
}
/***************************************************************************
  Handling of XA id cacheing
***************************************************************************/

pthread_mutex_t LOCK_xid_cache;
HASH xid_cache;

extern "C" uchar *xid_get_hash_key(const uchar *, size_t *, bool);
extern "C" void xid_free_hash(void *);

uchar *xid_get_hash_key(const uchar *ptr, size_t *length,
                        bool not_used __attribute__((unused)))
{
  *length=((XID_STATE*)ptr)->xid.key_length();
  return ((XID_STATE*)ptr)->xid.key();
}

void xid_free_hash(void *ptr)
{
  if (!((XID_STATE*)ptr)->in_thd)
    my_free((uchar*)ptr, MYF(0));
}

bool xid_cache_init()
{
  pthread_mutex_init(&LOCK_xid_cache, MY_MUTEX_INIT_FAST);
  return hash_init(&xid_cache, &my_charset_bin, 100, 0, 0,
                   xid_get_hash_key, xid_free_hash, 0) != 0;
}

void xid_cache_free()
{
  if (hash_inited(&xid_cache))
  {
    hash_free(&xid_cache);
    pthread_mutex_destroy(&LOCK_xid_cache);
  }
}

XID_STATE *xid_cache_search(XID *xid)
{
  pthread_mutex_lock(&LOCK_xid_cache);
  XID_STATE *res=(XID_STATE *)hash_search(&xid_cache, xid->key(), xid->key_length());
  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}


bool xid_cache_insert(XID *xid, enum xa_states xa_state)
{
  XID_STATE *xs;
  bool res;
  pthread_mutex_lock(&LOCK_xid_cache);
  if (hash_search(&xid_cache, xid->key(), xid->key_length()))
    res=0;
  else if (!(xs=(XID_STATE *)my_malloc(sizeof(*xs), MYF(MY_WME))))
    res=1;
  else
  {
    xs->xa_state=xa_state;
    xs->xid.set(xid);
    xs->in_thd=0;
    res=my_hash_insert(&xid_cache, (uchar*)xs);
  }
  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}


bool xid_cache_insert(XID_STATE *xid_state)
{
  pthread_mutex_lock(&LOCK_xid_cache);
  assert(hash_search(&xid_cache, xid_state->xid.key(),
                          xid_state->xid.key_length())==0);
  bool res=my_hash_insert(&xid_cache, (uchar*)xid_state);
  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}


void xid_cache_delete(XID_STATE *xid_state)
{
  pthread_mutex_lock(&LOCK_xid_cache);
  hash_delete(&xid_cache, (uchar *)xid_state);
  pthread_mutex_unlock(&LOCK_xid_cache);
}

/*
  Implementation of interface to write rows to the binary log through the
  thread.  The thread is responsible for writing the rows it has
  inserted/updated/deleted.
*/

#ifndef MYSQL_CLIENT

/*
  Template member function for ensuring that there is an rows log
  event of the apropriate type before proceeding.

  PRE CONDITION:
    - Events of type 'RowEventT' have the type code 'type_code'.
    
  POST CONDITION:
    If a non-NULL pointer is returned, the pending event for thread 'thd' will
    be an event of type 'RowEventT' (which have the type code 'type_code')
    will either empty or have enough space to hold 'needed' bytes.  In
    addition, the columns bitmap will be correct for the row, meaning that
    the pending event will be flushed if the columns in the event differ from
    the columns suppled to the function.

  RETURNS
    If no error, a non-NULL pending event (either one which already existed or
    the newly created one).
    If error, NULL.
 */

template <class RowsEventT> Rows_log_event* 
THD::binlog_prepare_pending_rows_event(TABLE* table, uint32_t serv_id,
                                       size_t needed,
                                       bool is_transactional,
				       RowsEventT *hint __attribute__((unused)))
{
  /* Pre-conditions */
  assert(table->s->table_map_id != ~0UL);

  /* Fetch the type code for the RowsEventT template parameter */
  int const type_code= RowsEventT::TYPE_CODE;

  /*
    There is no good place to set up the transactional data, so we
    have to do it here.
  */
  if (binlog_setup_trx_data())
    return(NULL);

  Rows_log_event* pending= binlog_get_pending_rows_event();

  if (unlikely(pending && !pending->is_valid()))
    return(NULL);

  /*
    Check if the current event is non-NULL and a write-rows
    event. Also check if the table provided is mapped: if it is not,
    then we have switched to writing to a new table.
    If there is no pending event, we need to create one. If there is a pending
    event, but it's not about the same table id, or not of the same type
    (between Write, Update and Delete), or not the same affected columns, or
    going to be too big, flush this event to disk and create a new pending
    event.

    The last test is necessary for the Cluster injector to work
    correctly. The reason is that the Cluster can inject two write
    rows with different column bitmaps if there is an insert followed
    by an update in the same transaction, and these are grouped into a
    single epoch/transaction when fed to the injector.

    TODO: Fix the code so that the last test can be removed.
  */
  if (!pending ||
      pending->server_id != serv_id || 
      pending->get_table_id() != table->s->table_map_id ||
      pending->get_type_code() != type_code || 
      pending->get_data_size() + needed > opt_binlog_rows_event_max_size ||
      !bitmap_cmp(pending->get_cols(), table->write_set))
    {
    /* Create a new RowsEventT... */
    Rows_log_event* const
	ev= new RowsEventT(this, table, table->s->table_map_id,
                           is_transactional);
    if (unlikely(!ev))
      return(NULL);
    ev->server_id= serv_id; // I don't like this, it's too easy to forget.
    /*
      flush the pending event and replace it with the newly created
      event...
    */
    if (unlikely(mysql_bin_log.flush_and_set_pending_rows_event(this, ev)))
    {
      delete ev;
      return(NULL);
    }

    return(ev);               /* This is the new pending event */
  }
  return(pending);        /* This is the current pending event */
}

#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
/*
  Instantiate the versions we need, we have -fno-implicit-template as
  compiling option.
*/
template Rows_log_event*
THD::binlog_prepare_pending_rows_event(TABLE*, uint32_t, size_t, bool,
				       Write_rows_log_event*);

template Rows_log_event*
THD::binlog_prepare_pending_rows_event(TABLE*, uint32_t, size_t, bool,
				       Delete_rows_log_event *);

template Rows_log_event* 
THD::binlog_prepare_pending_rows_event(TABLE*, uint32_t, size_t, bool,
				       Update_rows_log_event *);
#endif

namespace {
  /**
     Class to handle temporary allocation of memory for row data.

     The responsibilities of the class is to provide memory for
     packing one or two rows of packed data (depending on what
     constructor is called).

     In order to make the allocation more efficient for "simple" rows,
     i.e., rows that do not contain any blobs, a pointer to the
     allocated memory is of memory is stored in the table structure
     for simple rows.  If memory for a table containing a blob field
     is requested, only memory for that is allocated, and subsequently
     released when the object is destroyed.

   */
  class Row_data_memory {
  public:
    /**
      Build an object to keep track of a block-local piece of memory
      for storing a row of data.

      @param table
      Table where the pre-allocated memory is stored.

      @param length
      Length of data that is needed, if the record contain blobs.
     */
    Row_data_memory(TABLE *table, size_t const len1)
      : m_memory(0)
    {
      m_alloc_checked= false;
      allocate_memory(table, len1);
      m_ptr[0]= has_memory() ? m_memory : 0;
      m_ptr[1]= 0;
    }

    Row_data_memory(TABLE *table, size_t const len1, size_t const len2)
      : m_memory(0)
    {
      m_alloc_checked= false;
      allocate_memory(table, len1 + len2);
      m_ptr[0]= has_memory() ? m_memory        : 0;
      m_ptr[1]= has_memory() ? m_memory + len1 : 0;
    }

    ~Row_data_memory()
    {
      if (m_memory != 0 && m_release_memory_on_destruction)
        my_free((uchar*) m_memory, MYF(MY_WME));
    }

    /**
       Is there memory allocated?

       @retval true There is memory allocated
       @retval false Memory allocation failed
     */
    bool has_memory() const {
      m_alloc_checked= true;
      return m_memory != 0;
    }

    uchar *slot(uint s)
    {
      assert(s < sizeof(m_ptr)/sizeof(*m_ptr));
      assert(m_ptr[s] != 0);
      assert(m_alloc_checked == true);
      return m_ptr[s];
    }

  private:
    void allocate_memory(TABLE *const table, size_t const total_length)
    {
      if (table->s->blob_fields == 0)
      {
        /*
          The maximum length of a packed record is less than this
          length. We use this value instead of the supplied length
          when allocating memory for records, since we don't know how
          the memory will be used in future allocations.

          Since table->s->reclength is for unpacked records, we have
          to add two bytes for each field, which can potentially be
          added to hold the length of a packed field.
        */
        size_t const maxlen= table->s->reclength + 2 * table->s->fields;

        /*
          Allocate memory for two records if memory hasn't been
          allocated. We allocate memory for two records so that it can
          be used when processing update rows as well.
        */
        if (table->write_row_record == 0)
          table->write_row_record=
            (uchar *) alloc_root(&table->mem_root, 2 * maxlen);
        m_memory= table->write_row_record;
        m_release_memory_on_destruction= false;
      }
      else
      {
        m_memory= (uchar *) my_malloc(total_length, MYF(MY_WME));
        m_release_memory_on_destruction= true;
      }
    }

    mutable bool m_alloc_checked;
    bool m_release_memory_on_destruction;
    uchar *m_memory;
    uchar *m_ptr[2];
  };
}


int THD::binlog_write_row(TABLE* table, bool is_trans, 
                          uchar const *record) 
{ 
  assert(current_stmt_binlog_row_based && mysql_bin_log.is_open());

  /*
    Pack records into format for transfer. We are allocating more
    memory than needed, but that doesn't matter.
  */
  Row_data_memory memory(table, max_row_length(table, record));
  if (!memory.has_memory())
    return HA_ERR_OUT_OF_MEM;

  uchar *row_data= memory.slot(0);

  size_t const len= pack_row(table, table->write_set, row_data, record);

  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id, len, is_trans,
                                      static_cast<Write_rows_log_event*>(0));

  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return ev->add_row_data(row_data, len);
}

int THD::binlog_update_row(TABLE* table, bool is_trans,
                           const uchar *before_record,
                           const uchar *after_record)
{ 
  assert(current_stmt_binlog_row_based && mysql_bin_log.is_open());

  size_t const before_maxlen = max_row_length(table, before_record);
  size_t const after_maxlen  = max_row_length(table, after_record);

  Row_data_memory row_data(table, before_maxlen, after_maxlen);
  if (!row_data.has_memory())
    return HA_ERR_OUT_OF_MEM;

  uchar *before_row= row_data.slot(0);
  uchar *after_row= row_data.slot(1);

  size_t const before_size= pack_row(table, table->read_set, before_row,
                                        before_record);
  size_t const after_size= pack_row(table, table->write_set, after_row,
                                       after_record);

  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id,
				      before_size + after_size, is_trans,
				      static_cast<Update_rows_log_event*>(0));

  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return
    ev->add_row_data(before_row, before_size) ||
    ev->add_row_data(after_row, after_size);
}

int THD::binlog_delete_row(TABLE* table, bool is_trans, 
                           uchar const *record)
{ 
  assert(current_stmt_binlog_row_based && mysql_bin_log.is_open());

  /* 
     Pack records into format for transfer. We are allocating more
     memory than needed, but that doesn't matter.
  */
  Row_data_memory memory(table, max_row_length(table, record));
  if (unlikely(!memory.has_memory()))
    return HA_ERR_OUT_OF_MEM;

  uchar *row_data= memory.slot(0);

  size_t const len= pack_row(table, table->read_set, row_data, record);

  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id, len, is_trans,
				      static_cast<Delete_rows_log_event*>(0));

  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return ev->add_row_data(row_data, len);
}


int THD::binlog_flush_pending_rows_event(bool stmt_end)
{
  /*
    We shall flush the pending event even if we are not in row-based
    mode: it might be the case that we left row-based mode before
    flushing anything (e.g., if we have explicitly locked tables).
   */
  if (!mysql_bin_log.is_open())
    return(0);

  /*
    Mark the event as the last event of a statement if the stmt_end
    flag is set.
  */
  int error= 0;
  if (Rows_log_event *pending= binlog_get_pending_rows_event())
  {
    if (stmt_end)
    {
      pending->set_flags(Rows_log_event::STMT_END_F);
      pending->flags|= LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F;
      binlog_table_maps= 0;
    }

    error= mysql_bin_log.flush_and_set_pending_rows_event(this, 0);
  }

  return(error);
}


/*
  Member function that will log query, either row-based or
  statement-based depending on the value of the 'current_stmt_binlog_row_based'
  the value of the 'qtype' flag.

  This function should be called after the all calls to ha_*_row()
  functions have been issued, but before tables are unlocked and
  closed.

  OBSERVE
    There shall be no writes to any system table after calling
    binlog_query(), so these writes has to be moved to before the call
    of binlog_query() for correct functioning.

    This is necessesary not only for RBR, but the master might crash
    after binlogging the query but before changing the system tables.
    This means that the slave and the master are not in the same state
    (after the master has restarted), so therefore we have to
    eliminate this problem.

  RETURN VALUE
    Error code, or 0 if no error.
*/
int THD::binlog_query(THD::enum_binlog_query_type qtype, char const *query_arg,
                      ulong query_len, bool is_trans, bool suppress_use,
                      THD::killed_state killed_status_arg)
{
  assert(query_arg && mysql_bin_log.is_open());

  if (int error= binlog_flush_pending_rows_event(true))
    return(error);

  /*
    If we are in statement mode and trying to log an unsafe statement,
    we should print a warning.
  */
  if (lex->is_stmt_unsafe() &&
      variables.binlog_format == BINLOG_FORMAT_STMT)
  {
    assert(this->query != NULL);
    push_warning(this, DRIZZLE_ERROR::WARN_LEVEL_WARN,
                 ER_BINLOG_UNSAFE_STATEMENT,
                 ER(ER_BINLOG_UNSAFE_STATEMENT));
    if (!(binlog_flags & BINLOG_FLAG_UNSAFE_STMT_PRINTED))
    {
      char warn_buf[DRIZZLE_ERRMSG_SIZE];
      snprintf(warn_buf, DRIZZLE_ERRMSG_SIZE, "%s Statement: %s",
               ER(ER_BINLOG_UNSAFE_STATEMENT), this->query);
      sql_print_warning(warn_buf);
      binlog_flags|= BINLOG_FLAG_UNSAFE_STMT_PRINTED;
    }
  }

  switch (qtype) {
  case THD::ROW_QUERY_TYPE:
    if (current_stmt_binlog_row_based)
      return(0);
    /* Otherwise, we fall through */
  case THD::MYSQL_QUERY_TYPE:
    /*
      Using this query type is a conveniece hack, since we have been
      moving back and forth between using RBR for replication of
      system tables and not using it.

      Make sure to change in check_table_binlog_row_based() according
      to how you treat this.
    */
  case THD::STMT_QUERY_TYPE:
    /*
      The MYSQL_LOG::write() function will set the STMT_END_F flag and
      flush the pending rows event if necessary.
     */
    {
      Query_log_event qinfo(this, query_arg, query_len, is_trans, suppress_use,
                            killed_status_arg);
      qinfo.flags|= LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F;
      /*
        Binlog table maps will be irrelevant after a Query_log_event
        (they are just removed on the slave side) so after the query
        log event is written to the binary log, we pretend that no
        table maps were written.
       */
      int error= mysql_bin_log.write(&qinfo);
      binlog_table_maps= 0;
      return(error);
    }
    break;

  case THD::QUERY_TYPE_COUNT:
  default:
    assert(0 <= qtype && qtype < QUERY_TYPE_COUNT);
  }
  return(0);
}

bool Discrete_intervals_list::append(uint64_t start, uint64_t val,
                                 uint64_t incr)
{
  /* first, see if this can be merged with previous */
  if ((head == NULL) || tail->merge_if_contiguous(start, val, incr))
  {
    /* it cannot, so need to add a new interval */
    Discrete_interval *new_interval= new Discrete_interval(start, val, incr);
    return(append(new_interval));
  }
  return(0);
}

bool Discrete_intervals_list::append(Discrete_interval *new_interval)
{
  if (unlikely(new_interval == NULL))
    return(1);
  if (head == NULL)
    head= current= new_interval;
  else
    tail->next= new_interval;
  tail= new_interval;
  elements++;
  return(0);
}

#endif /* !defined(MYSQL_CLIENT) */