FM / private

/usr/include/mysql/server/private

Name	Size	Mode	Actions
atomic/	-	0755	rm
data/	-	0755	rm
providers/	-	0755	rm
aligned.h	1136	0644	edit dl rm
aria_backup.h	1787	0644	edit dl rm
assume_aligned.h	2350	0644	edit dl rm
authors.h	10141	0644	edit dl rm
backup.h	1703	0644	edit dl rm
bounded_queue.h	6093	0644	edit dl rm
client_settings.h	1935	0644	edit dl rm
compat56.h	2280	0644	edit dl rm
config.h	14543	0644	edit dl rm
contributors.h	4878	0644	edit dl rm
create_options.h	4193	0644	edit dl rm
create_tmp_table.h	2808	0644	edit dl rm
cset_narrowing.h	3968	0644	edit dl rm
custom_conf.h	1082	0644	edit dl rm
datadict.h	1700	0644	edit dl rm
ddl_log.h	12807	0644	edit dl rm
debug.h	1234	0644	edit dl rm
debug_sync.h	2046	0644	edit dl rm
derived_handler.h	2379	0644	edit dl rm
derror.h	980	0644	edit dl rm
des_key_file.h	1236	0644	edit dl rm
discover.h	1570	0644	edit dl rm
dur_prop.h	1082	0644	edit dl rm
embedded_priv.h	1733	0644	edit dl rm
events.h	4704	0644	edit dl rm
event_data_objects.h	4187	0644	edit dl rm
event_db_repository.h	3648	0644	edit dl rm
event_parse_data.h	2899	0644	edit dl rm
event_queue.h	3438	0644	edit dl rm
event_scheduler.h	3290	0644	edit dl rm
field.h	222336	0644	edit dl rm
field_comp.h	1174	0644	edit dl rm
filesort.h	7283	0644	edit dl rm
filesort_utils.h	8195	0644	edit dl rm
ft_global.h	3113	0644	edit dl rm
gcalc_slicescan.h	17272	0644	edit dl rm
gcalc_tools.h	11900	0644	edit dl rm
grant.h	2758	0644	edit dl rm
group_by_handler.h	3534	0644	edit dl rm
gstream.h	2437	0644	edit dl rm
handler.h	199730	0644	edit dl rm
handle_connections_win.h	884	0644	edit dl rm
hash.h	4452	0644	edit dl rm
hash_filo.h	5688	0644	edit dl rm
ha_handler_stats.h	2335	0644	edit dl rm
ha_partition.h	64696	0644	edit dl rm
ha_sequence.h	6245	0644	edit dl rm
heap.h	9480	0644	edit dl rm
hostname.h	5419	0644	edit dl rm
ilist.h	7237	0644	edit dl rm
init.h	852	0644	edit dl rm
innodb_priv.h	1319	0644	edit dl rm
item.h	283188	0644	edit dl rm
item_cmpfunc.h	135071	0644	edit dl rm
item_create.h	11508	0644	edit dl rm
item_func.h	138638	0644	edit dl rm
item_geofunc.h	39612	0644	edit dl rm
item_jsonfunc.h	25264	0644	edit dl rm
item_row.h	5229	0644	edit dl rm
item_strfunc.h	74995	0644	edit dl rm
item_subselect.h	59028	0644	edit dl rm
item_sum.h	72695	0644	edit dl rm
item_timefunc.h	65896	0644	edit dl rm
item_vers.h	4413	0644	edit dl rm
item_windowfunc.h	34556	0644	edit dl rm
item_xmlfunc.h	4650	0644	edit dl rm
json_table.h	9667	0644	edit dl rm
key.h	2132	0644	edit dl rm
keycaches.h	1995	0644	edit dl rm
lex.h	29840	0644	edit dl rm
lex_charset.h	24313	0644	edit dl rm
lex_hash.h	143108	0644	edit dl rm
lex_ident.h	2122	0644	edit dl rm
lex_string.h	4077	0644	edit dl rm
lex_symbol.h	1323	0644	edit dl rm
lex_token.h	42641	0644	edit dl rm
lf.h	6462	0644	edit dl rm
lock.h	2220	0644	edit dl rm
log.h	46370	0644	edit dl rm
log_event.h	189106	0644	edit dl rm
log_event_data_type.h	1890	0644	edit dl rm
log_event_old.h	19830	0644	edit dl rm
log_slow.h	2442	0644	edit dl rm
maria.h	5872	0644	edit dl rm
mariadb.h	1277	0644	edit dl rm
mdl.h	38503	0644	edit dl rm
mem_root_array.h	7106	0644	edit dl rm
message.h	1195	0644	edit dl rm
multi_range_read.h	23179	0644	edit dl rm
myisam.h	17506	0644	edit dl rm
myisamchk.h	4734	0644	edit dl rm
myisammrg.h	4897	0644	edit dl rm
myisampack.h	14929	0644	edit dl rm
mysqld.h	41063	0644	edit dl rm
mysqld_default_groups.h	204	0644	edit dl rm
mysqld_suffix.h	1201	0644	edit dl rm
mysys_err.h	3022	0644	edit dl rm
my_alarm.h	2429	0644	edit dl rm
my_apc.h	4747	0644	edit dl rm
my_atomic.h	7281	0644	edit dl rm
my_atomic_wrapper.h	3051	0644	edit dl rm
my_base.h	27656	0644	edit dl rm
my_bit.h	6196	0644	edit dl rm
my_bitmap.h	5502	0644	edit dl rm
my_check_opt.h	2618	0644	edit dl rm
my_compare.h	11194	0644	edit dl rm
my_counter.h	1721	0644	edit dl rm
my_cpu.h	4855	0644	edit dl rm
my_crypt.h	904	0644	edit dl rm
my_decimal.h	14489	0644	edit dl rm
my_default.h	1880	0644	edit dl rm
my_handler_errors.h	4882	0644	edit dl rm
my_json_writer.h	18573	0644	edit dl rm
my_libwrap.h	1183	0644	edit dl rm
my_md5.h	1486	0644	edit dl rm
my_minidump.h	848	0644	edit dl rm
my_nosys.h	1438	0644	edit dl rm
my_rdtsc.h	10119	0644	edit dl rm
my_rnd.h	1014	0644	edit dl rm
my_service_manager.h	2087	0644	edit dl rm
my_stacktrace.h	3215	0644	edit dl rm
my_stack_alloc.h	6493	0644	edit dl rm
my_time.h	10414	0644	edit dl rm
my_tree.h	3991	0644	edit dl rm
my_uctype.h	69528	0644	edit dl rm
my_user.h	1126	0644	edit dl rm
my_virtual_mem.h	1127	0644	edit dl rm
opt_histogram_json.h	4638	0644	edit dl rm
opt_range.h	65903	0644	edit dl rm
opt_subselect.h	14545	0644	edit dl rm
opt_trace.h	8494	0644	edit dl rm
opt_trace_context.h	3291	0644	edit dl rm
parse_file.h	4387	0644	edit dl rm
partition_element.h	5428	0644	edit dl rm
partition_info.h	19864	0644	edit dl rm
password.h	1170	0644	edit dl rm
pfs_file_provider.h	3153	0644	edit dl rm
pfs_idle_provider.h	1385	0644	edit dl rm
pfs_memory_provider.h	1626	0644	edit dl rm
pfs_metadata_provider.h	1898	0644	edit dl rm
pfs_socket_provider.h	2258	0644	edit dl rm
pfs_stage_provider.h	1556	0644	edit dl rm
pfs_statement_provider.h	4347	0644	edit dl rm
pfs_table_provider.h	2625	0644	edit dl rm
pfs_thread_provider.h	5560	0644	edit dl rm
pfs_transaction_provider.h	2846	0644	edit dl rm
privilege.h	28889	0644	edit dl rm
probes_mysql.h	973	0644	edit dl rm
probes_mysql_nodtrace.h	6087	0644	edit dl rm
procedure.h	6819	0644	edit dl rm
protocol.h	12537	0644	edit dl rm
proxy_protocol.h	548	0644	edit dl rm
queues.h	3477	0644	edit dl rm
records.h	3147	0644	edit dl rm
replication.h	16130	0644	edit dl rm
repl_failsafe.h	1585	0644	edit dl rm
rijndael.h	1711	0644	edit dl rm
rowid_filter.h	15474	0644	edit dl rm
rpl_constants.h	3357	0644	edit dl rm
rpl_filter.h	4774	0644	edit dl rm
rpl_gtid.h	29939	0644	edit dl rm
rpl_injector.h	9621	0644	edit dl rm
rpl_mi.h	16638	0644	edit dl rm
rpl_parallel.h	18228	0644	edit dl rm
rpl_record.h	1585	0644	edit dl rm
rpl_record_old.h	1407	0644	edit dl rm
rpl_reporting.h	3713	0644	edit dl rm
rpl_rli.h	36070	0644	edit dl rm
rpl_tblmap.h	3177	0644	edit dl rm
rpl_utility.h	9630	0644	edit dl rm
scheduler.h	3199	0644	edit dl rm
scope.h	4393	0644	edit dl rm
select_handler.h	2228	0644	edit dl rm
semisync.h	2287	0644	edit dl rm
semisync_master.h	25766	0644	edit dl rm
semisync_master_ack_receiver.h	8709	0644	edit dl rm
semisync_slave.h	3736	0644	edit dl rm
service_versions.h	2285	0644	edit dl rm
session_tracker.h	14275	0644	edit dl rm
set_var.h	16551	0644	edit dl rm
slave.h	12275	0644	edit dl rm
socketpair.h	842	0644	edit dl rm
source_revision.h	67	0644	edit dl rm
sp.h	22588	0644	edit dl rm
span.h	3931	0644	edit dl rm
spatial.h	22698	0644	edit dl rm
sp_cache.h	2037	0644	edit dl rm
sp_head.h	64917	0644	edit dl rm
sp_pcontext.h	24893	0644	edit dl rm
sp_rcontext.h	14441	0644	edit dl rm
sql_acl.h	14167	0644	edit dl rm
sql_admin.h	2915	0644	edit dl rm
sql_alloc.h	1732	0644	edit dl rm
sql_alter.h	15395	0644	edit dl rm
sql_analyse.h	11125	0644	edit dl rm
sql_analyze_stmt.h	12683	0644	edit dl rm
sql_array.h	6858	0644	edit dl rm
sql_audit.h	14162	0644	edit dl rm
sql_base.h	26041	0644	edit dl rm
sql_basic_types.h	9523	0644	edit dl rm
sql_binlog.h	895	0644	edit dl rm
sql_bitmap.h	7842	0644	edit dl rm
sql_bootstrap.h	1812	0644	edit dl rm
sql_cache.h	21676	0644	edit dl rm
sql_callback.h	1542	0644	edit dl rm
sql_class.h	271120	0644	edit dl rm
sql_cmd.h	5962	0644	edit dl rm
sql_command.h	4800	0644	edit dl rm
sql_connect.h	4087	0644	edit dl rm
sql_const.h	11415	0644	edit dl rm
sql_crypt.h	1437	0644	edit dl rm
sql_cte.h	16494	0644	edit dl rm
sql_cursor.h	4239	0644	edit dl rm
sql_db.h	2438	0644	edit dl rm
sql_debug.h	5646	0644	edit dl rm
sql_delete.h	1343	0644	edit dl rm
sql_derived.h	1289	0644	edit dl rm
sql_digest.h	3819	0644	edit dl rm
sql_digest_stream.h	1567	0644	edit dl rm
sql_do.h	954	0644	edit dl rm
sql_error.h	39843	0644	edit dl rm
sql_explain.h	30319	0644	edit dl rm
sql_expression_cache.h	4359	0644	edit dl rm
sql_get_diagnostics.h	7883	0644	edit dl rm
sql_handler.h	2910	0644	edit dl rm
sql_help.h	995	0644	edit dl rm
sql_hset.h	3401	0644	edit dl rm
sql_insert.h	5173	0644	edit dl rm
sql_i_s.h	8487	0644	edit dl rm
sql_join_cache.h	48659	0644	edit dl rm
sql_lex.h	174693	0644	edit dl rm
sql_lifo_buffer.h	9676	0644	edit dl rm
sql_limit.h	3187	0644	edit dl rm
sql_list.h	22391	0644	edit dl rm
sql_load.h	1276	0644	edit dl rm
sql_locale.h	2701	0644	edit dl rm
sql_manager.h	960	0644	edit dl rm
sql_mode.h	6735	0644	edit dl rm
sql_parse.h	8970	0644	edit dl rm
sql_partition.h	12674	0644	edit dl rm
sql_partition_admin.h	5940	0644	edit dl rm
sql_plist.h	7711	0644	edit dl rm
sql_plugin.h	7577	0644	edit dl rm
sql_plugin_compat.h	2237	0644	edit dl rm
sql_prepare.h	11409	0644	edit dl rm
sql_priv.h	18474	0644	edit dl rm
sql_profile.h	7816	0644	edit dl rm
sql_reload.h	1036	0644	edit dl rm
sql_rename.h	982	0644	edit dl rm
sql_repl.h	3045	0644	edit dl rm
sql_schema.h	3303	0644	edit dl rm
sql_select.h	89743	0644	edit dl rm
sql_sequence.h	5177	0644	edit dl rm
sql_servers.h	1777	0644	edit dl rm
sql_show.h	9830	0644	edit dl rm
sql_signal.h	3362	0644	edit dl rm
sql_sort.h	21964	0644	edit dl rm
sql_statistics.h	16494	0644	edit dl rm
sql_string.h	39009	0644	edit dl rm
sql_table.h	9752	0644	edit dl rm
sql_test.h	1589	0644	edit dl rm
sql_time.h	8374	0644	edit dl rm
sql_trigger.h	12332	0644	edit dl rm
sql_truncate.h	2079	0644	edit dl rm
sql_tvc.h	2418	0644	edit dl rm
sql_type.h	296072	0644	edit dl rm
sql_type_fixedbin.h	65578	0644	edit dl rm
sql_type_fixedbin_storage.h	5467	0644	edit dl rm
sql_type_geom.h	19039	0644	edit dl rm
sql_type_int.h	10001	0644	edit dl rm
sql_type_json.h	6155	0644	edit dl rm
sql_type_real.h	1257	0644	edit dl rm
sql_type_string.h	1629	0644	edit dl rm
sql_udf.h	4850	0644	edit dl rm
sql_union.h	1068	0644	edit dl rm
sql_update.h	1923	0644	edit dl rm
sql_view.h	2470	0644	edit dl rm
sql_window.h	6814	0644	edit dl rm
ssl_compat.h	3380	0644	edit dl rm
strfunc.h	2275	0644	edit dl rm
structs.h	29530	0644	edit dl rm
sys_vars_shared.h	2729	0644	edit dl rm
table.h	118414	0644	edit dl rm
table_cache.h	4232	0644	edit dl rm
threadpool.h	4810	0644	edit dl rm
threadpool_generic.h	3969	0644	edit dl rm
threadpool_winsockets.h	2290	0644	edit dl rm
thread_cache.h	5905	0644	edit dl rm
thr_alarm.h	2932	0644	edit dl rm
thr_lock.h	7350	0644	edit dl rm
thr_malloc.h	1202	0644	edit dl rm
thr_timer.h	1563	0644	edit dl rm
transaction.h	1466	0644	edit dl rm
tzfile.h	5014	0644	edit dl rm
tztime.h	3397	0644	edit dl rm
t_ctype.h	5639	0644	edit dl rm
uniques.h	4217	0644	edit dl rm
unireg.h	7722	0644	edit dl rm
vers_string.h	2543	0644	edit dl rm
violite.h	10086	0644	edit dl rm
waiting_threads.h	4532	0644	edit dl rm
welcome_copyright_notice.h	1218	0644	edit dl rm
winservice.h	6019	0644	edit dl rm
win_tzname_data.h	6506	0644	edit dl rm
wqueue.h	1565	0644	edit dl rm
wsrep.h	3308	0644	edit dl rm
wsrep_allowlist_service.h	1035	0644	edit dl rm
wsrep_applier.h	2703	0644	edit dl rm
wsrep_binlog.h	3551	0644	edit dl rm
wsrep_client_service.h	2560	0644	edit dl rm
wsrep_client_state.h	1566	0644	edit dl rm
wsrep_condition_variable.h	1484	0644	edit dl rm
wsrep_high_priority_service.h	4912	0644	edit dl rm
wsrep_mutex.h	1239	0644	edit dl rm
wsrep_mysqld.h	21524	0644	edit dl rm
wsrep_mysqld_c.h	1227	0644	edit dl rm
wsrep_on.h	1718	0644	edit dl rm
wsrep_priv.h	1634	0644	edit dl rm
wsrep_schema.h	5608	0644	edit dl rm
wsrep_server_service.h	3631	0644	edit dl rm
wsrep_server_state.h	2529	0644	edit dl rm
wsrep_sst.h	3951	0644	edit dl rm
wsrep_status.h	1816	0644	edit dl rm
wsrep_storage_service.h	1809	0644	edit dl rm
wsrep_thd.h	11487	0644	edit dl rm
wsrep_trans_observer.h	18174	0644	edit dl rm
wsrep_types.h	1110	0644	edit dl rm
wsrep_utils.h	9807	0644	edit dl rm
wsrep_var.h	4491	0644	edit dl rm
wsrep_xid.h	1549	0644	edit dl rm
xa.h	1845	0644	edit dl rm

Edit: /usr/include/mysql/server/private/sql_type_fixedbin.h (65578B)

#ifndef SQL_TYPE_FIXEDBIN_H
#define SQL_TYPE_FIXEDBIN_H
/* Copyright (c) 2019,2021 MariaDB Corporation

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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */

/*
  This is a common code for plugin (?) types that are generally
  handled like strings, but have their own fixed size on-disk binary storage
  format and their own (variable size) canonical string representation.

Examples are INET6 and UUID types.
*/

#define MYSQL_SERVER
#include "sql_class.h" // THD, SORT_FIELD_ATTR
#include "opt_range.h" // SEL_ARG, null_element
#include "sql_type_fixedbin_storage.h"

/***********************************************************************/

template<class FbtImpl> class Type_collection_fbt;

template<class FbtImpl, class TypeCollectionImpl = Type_collection_fbt<FbtImpl> >
class Type_handler_fbt: public Type_handler
{
  /* =[ internal helper classes ]=============================== */

public:
  class Fbt: public FbtImpl
  {
  protected:
    using FbtImpl::m_buffer;
    bool make_from_item(Item *item, bool warn)
    {
      if (item->type_handler() == singleton())
      {
        Native tmp(m_buffer, sizeof(m_buffer));
        bool rc= item->val_native(current_thd, &tmp);
        if (rc)
          return true;
        DBUG_ASSERT(tmp.length() == sizeof(m_buffer));
        if (tmp.ptr() != m_buffer)
          memcpy(m_buffer, tmp.ptr(), sizeof(m_buffer));
        return false;
      }
      StringBuffer<FbtImpl::max_char_length()+1> tmp;
      String *str= item->val_str(&tmp);
      return str ? make_from_character_or_binary_string(str, warn) : true;
    }

bool character_string_to_fbt(const char *str, size_t str_length,
                                  CHARSET_INFO *cs)
    {
      if (cs->state & MY_CS_NONASCII)
      {
        char tmp[FbtImpl::max_char_length()+1];
        String_copier copier;
        uint length= copier.well_formed_copy(&my_charset_latin1, tmp, sizeof(tmp),
                                             cs, str, str_length);
        return FbtImpl::ascii_to_fbt(tmp, length);
      }
      return FbtImpl::ascii_to_fbt(str, str_length);
    }
    bool make_from_character_or_binary_string(const String *str, bool warn)
    {
      if (str->charset() != &my_charset_bin)
      {
        bool rc= character_string_to_fbt(str->ptr(), str->length(),
                                          str->charset());
        if (rc && warn)
          current_thd->push_warning_wrong_value(Sql_condition::WARN_LEVEL_WARN,
                       singleton()->name().ptr(), ErrConvString(str).ptr());
        return rc;
      }
      if (str->length() != sizeof(m_buffer))
      {
        if (warn)
          current_thd->push_warning_wrong_value(Sql_condition::WARN_LEVEL_WARN,
                       singleton()->name().ptr(), ErrConvString(str).ptr());
        return true;
      }
      DBUG_ASSERT(str->ptr() != m_buffer);
      memcpy(m_buffer, str->ptr(), sizeof(m_buffer));
      return false;
    }
    bool binary_to_fbt(const char *str, size_t length)
    {
      if (length != sizeof(m_buffer))
        return true;
      memcpy(m_buffer, str, length);
      return false;
    }

Fbt() { }

public:

static Fbt zero()
     {
       Fbt fbt;
       fbt.set_zero();
       return fbt;
     }

static Fbt record_to_memory(const char *ptr)
     {
       Fbt fbt;
       FbtImpl::record_to_memory(fbt.m_buffer, ptr);
       return fbt;
     }
    /*
      Check at Item's fix_fields() time if "item" can return a nullable value
      on conversion to Fbt, or conversion produces a NOT NULL Fbt value.
    */
    static bool fix_fields_maybe_null_on_conversion_to_fbt(Item *item)
    {
      if (item->maybe_null())
        return true;
      if (item->type_handler() == singleton())
        return false;
      if (!item->const_item() || item->is_expensive())
        return true;
      return Fbt_null(item, false).is_null();
    }

/*
      Check at fix_fields() time if any of the items can return a nullable
      value on conversion to Fbt.
    */
    static bool fix_fields_maybe_null_on_conversion_to_fbt(Item **items,
                                                           uint count)
    {
      for (uint i= 0; i < count; i++)
      {
        if (Fbt::fix_fields_maybe_null_on_conversion_to_fbt(items[i]))
          return true;
      }
      return false;
    }

public:

Fbt(Item *item, bool *error, bool warn= true)
    {
      *error= make_from_item(item, warn);
    }
    void to_record(char *str, size_t str_size) const
    {
      DBUG_ASSERT(str_size >= sizeof(m_buffer));
      FbtImpl::memory_to_record(str, m_buffer);
    }
    bool to_binary(String *to) const
    {
      return to->copy(m_buffer, sizeof(m_buffer), &my_charset_bin);
    }
    bool to_native(Native *to) const
    {
      return to->copy(m_buffer, sizeof(m_buffer));
    }
    bool to_string(String *to) const
    {
      to->set_charset(&my_charset_latin1);
      if (to->alloc(FbtImpl::max_char_length()+1))
        return true;
      to->length((uint32) FbtImpl::to_string(const_cast<char*>(to->ptr()),
                                             FbtImpl::max_char_length()+1));
      return false;
    }
    bool to_bool() const
    {
      return !this->only_zero_bytes(m_buffer, FbtImpl::binary_length());
    }
    int cmp(const Binary_string &other) const
    {
      return FbtImpl::cmp(FbtImpl::to_lex_cstring(), other.to_lex_cstring());
    }
    int cmp(const Fbt &other) const
    {
      return FbtImpl::cmp(FbtImpl::to_lex_cstring(), other.to_lex_cstring());
    }
  };

class Fbt_null: public Fbt, public Null_flag
  {
  public:
    // Initialize from a text representation
    Fbt_null(const char *str, size_t length, CHARSET_INFO *cs)
     :Null_flag(Fbt::character_string_to_fbt(str, length, cs)) { }
    Fbt_null(const String &str)
     :Fbt_null(str.ptr(), str.length(), str.charset()) { }
    // Initialize from a binary representation
    Fbt_null(const char *str, size_t length)
     :Null_flag(Fbt::binary_to_fbt(str, length)) { }
    Fbt_null(const Binary_string &str)
     :Fbt_null(str.ptr(), str.length()) { }
    // Initialize from an Item
    Fbt_null(Item *item, bool warn= true)
     :Null_flag(Fbt::make_from_item(item, warn)) { }
  public:
    const Fbt& to_fbt() const
    {
      DBUG_ASSERT(!is_null());
      return *this;
    }
    void to_record(char *str, size_t str_size) const
    {
      to_fbt().to_record(str, str_size);
    }
    bool to_binary(String *to) const
    {
      return to_fbt().to_binary(to);
    }
    bool to_string(String *to) const
    {
      return to_fbt().to_string(to);
    }
  };

/* =[ API classes ]=========================================== */

class Type_std_attributes_fbt: public Type_std_attributes
  {
  public:
    Type_std_attributes_fbt()
     :Type_std_attributes(
        Type_numeric_attributes(FbtImpl::max_char_length(), 0, true),
        DTCollation_numeric())
    { }
  };

class Item_literal_fbt: public Item_literal
  {
    Fbt m_value;
  public:
    Item_literal_fbt(THD *thd)
     :Item_literal(thd),
      m_value(Fbt::zero())
    { }
    Item_literal_fbt(THD *thd, const Fbt &value)
     :Item_literal(thd),
      m_value(value)
    { }
    const Type_handler *type_handler() const override
    {
      return singleton();
    }
    bool val_bool() override
    {
      return m_value.to_bool();
    }
    longlong val_int() override
    {
      return 0;
    }
    double val_real() override
    {
      return 0;
    }
    String *val_str(String *to) override
    {
      return m_value.to_string(to) ? NULL : to;
    }
    my_decimal *val_decimal(my_decimal *to) override
    {
      my_decimal_set_zero(to);
      return to;
    }
    bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) override
    {
      set_zero_time(ltime, MYSQL_TIMESTAMP_TIME);
      return false;
    }
    bool val_native(THD *thd, Native *to) override
    {
      return m_value.to_native(to);
    }
    void print(String *str, enum_query_type query_type) override
    {
      StringBuffer<FbtImpl::max_char_length()+64> tmp;
      tmp.append(singleton()->name().lex_cstring());
      my_caseup_str(&my_charset_latin1, tmp.c_ptr());
      str->append(tmp);
      str->append('\'');
      m_value.to_string(&tmp);
      str->append(tmp);
      str->append('\'');
    }

// Non-overriding methods
    void set_value(const Fbt &value)
    {
      m_value= value;
    }

protected:
    Item *shallow_copy(THD *thd) const override
    { return get_item_copy<Item_literal_fbt>(thd, this); }
    Item *deep_copy(THD *thd) const override
    { return shallow_copy_with_checks(thd); }
  };

class Field_fbt: public Field
  {
    static void set_min_value(char *ptr)
    {
      memset(ptr, 0, FbtImpl::binary_length());
    }
    static void set_max_value(char *ptr)
    {
      memset(ptr, 0xFF, FbtImpl::binary_length());
    }
    void store_warning(const ErrConv &str,
                       Sql_condition::enum_warning_level level)
    {
      if (get_thd()->count_cuted_fields <= CHECK_FIELD_EXPRESSION)
        return;
      const TABLE_SHARE *s= table->s;
      static const Name type_name= singleton()->name();
      get_thd()->push_warning_truncated_value_for_field(level, type_name.ptr(),
        str.ptr(), s ? s->db.str : nullptr, s ? s->table_name.str : nullptr,
        field_name.str);
    }
    int set_null_with_warn(const ErrConv &str)
    {
      store_warning(str, Sql_condition::WARN_LEVEL_WARN);
      set_null();
      return 1;
    }
    int set_min_value_with_warn(const ErrConv &str)
    {
      store_warning(str, Sql_condition::WARN_LEVEL_WARN);
      set_min_value((char*) ptr);
      return 1;
    }
    int set_max_value_with_warn(const ErrConv &str)
    {
      store_warning(str, Sql_condition::WARN_LEVEL_WARN);
      set_max_value((char*) ptr);
      return 1;
    }
    int store_fbt_null_with_warn(const Fbt_null &fbt,
                                   const ErrConvString &err)
    {
      DBUG_ASSERT(marked_for_write_or_computed());
      if (fbt.is_null())
        return maybe_null() ? set_null_with_warn(err)
                            : set_min_value_with_warn(err);
      fbt.to_record((char *) ptr, FbtImpl::binary_length());
      return 0;
    }

public:
    Field_fbt(const LEX_CSTRING *field_name_arg, const Record_addr &rec)
      :Field(rec.ptr(), FbtImpl::max_char_length(),
             rec.null_ptr(), rec.null_bit(), Field::NONE, field_name_arg)
    {
      flags|= BINARY_FLAG | UNSIGNED_FLAG;
    }
    const Type_handler *type_handler() const override
    {
      return singleton();
    }
    uint32 max_display_length() const override { return field_length; }
    bool str_needs_quotes() const override { return true; }
    const DTCollation &dtcollation() const override
    {
      static DTCollation_numeric c;
      return c;
    }
    CHARSET_INFO *charset(void) const override { return &my_charset_numeric; }
    const CHARSET_INFO *sort_charset(void) const override { return &my_charset_bin; }
    /**
      This makes client-server protocol convert the value according
      to @@character_set_client.
    */
    bool binary() const override { return false; }
    enum ha_base_keytype key_type() const override { return HA_KEYTYPE_BINARY; }

bool is_equal(const Column_definition &new_field) const override
    {
      return new_field.type_handler() == type_handler();
    }
    bool eq_def(const Field *field) const override
    {
      return Field::eq_def(field);
    }
    double pos_in_interval(Field *min, Field *max) override
    {
      return pos_in_interval_val_str(min, max, 0);
    }
    int cmp(const uchar *a, const uchar *b) const override
    { return memcmp(a, b, pack_length()); }

void sort_string(uchar *to, uint length) override
    {
      DBUG_ASSERT(length == pack_length());
      memcpy(to, ptr, length);
    }
    uint32 pack_length() const override
    {
      return FbtImpl::binary_length();
    }
    uint pack_length_from_metadata(uint field_metadata) const override
    {
      return FbtImpl::binary_length();
    }

void sql_type(String &str) const override
    {
      static Name name= singleton()->name();
      str.set_ascii(name.ptr(), name.length());
    }

void make_send_field(Send_field *to) override
    {
      Field::make_send_field(to);
      to->set_data_type_name(singleton()->name().lex_cstring());
    }

bool validate_value_in_record(THD *thd, const uchar *record) const override
    {
      return false;
    }

bool val_native(Native *to) override
    {
      DBUG_ASSERT(marked_for_read());
      if (to->alloc(FbtImpl::binary_length()))
        return true;
      to->length(FbtImpl::binary_length());
      FbtImpl::record_to_memory((char*) to->ptr(), (const char*) ptr);
      return false;
    }

Fbt to_fbt() const
    {
      DBUG_ASSERT(marked_for_read());
      return Fbt::record_to_memory((const char*) ptr);
    }

String *val_str(String *val_buffer, String *) override
    {
      return to_fbt().to_string(val_buffer) ? NULL : val_buffer;
    }

my_decimal *val_decimal(my_decimal *to) override
    {
      DBUG_ASSERT(marked_for_read());
      my_decimal_set_zero(to);
      return to;
    }

longlong val_int() override
    {
      DBUG_ASSERT(marked_for_read());
      return 0;
    }

double val_real() override
    {
      DBUG_ASSERT(marked_for_read());
      return 0;
    }

bool get_date(MYSQL_TIME *ltime, date_mode_t fuzzydate) override
    {
      DBUG_ASSERT(marked_for_read());
      set_zero_time(ltime, MYSQL_TIMESTAMP_TIME);
      return false;
    }

bool val_bool(void) override
    {
      DBUG_ASSERT(marked_for_read());
      return !Fbt::only_zero_bytes((const char *) ptr, FbtImpl::binary_length());
    }

int store_native(const Native &value) override
    {
      DBUG_ASSERT(marked_for_write_or_computed());
      DBUG_ASSERT(value.length() == FbtImpl::binary_length());
      FbtImpl::memory_to_record((char*) ptr, value.ptr());
      return 0;
    }

int store(const char *str, size_t length, CHARSET_INFO *cs) override
    {
      return cs == &my_charset_bin ? store_binary(str, length)
                                   : store_text(str, length, cs);
    }

int store_text(const char *str, size_t length, CHARSET_INFO *cs) override
    {
      return store_fbt_null_with_warn(Fbt_null(str, length, cs),
                                        ErrConvString(str, length, cs));
    }

int store_binary(const char *str, size_t length) override
    {
      return store_fbt_null_with_warn(Fbt_null(str, length),
                                        ErrConvString(str, length,
                                                      &my_charset_bin));
    }

int store_hex_hybrid(const char *str, size_t length) override
    {
      return Field_fbt::store_binary(str, length);
    }

int store_decimal(const my_decimal *num) override
    {
      DBUG_ASSERT(marked_for_write_or_computed());
      return set_min_value_with_warn(ErrConvDecimal(num));
    }

int store(longlong nr, bool unsigned_flag) override
    {
      DBUG_ASSERT(marked_for_write_or_computed());
      return set_min_value_with_warn(
              ErrConvInteger(Longlong_hybrid(nr, unsigned_flag)));
    }

int store(double nr) override
    {
      DBUG_ASSERT(marked_for_write_or_computed());
      return set_min_value_with_warn(ErrConvDouble(nr));
    }

int store_time_dec(const MYSQL_TIME *ltime, uint dec) override
    {
      DBUG_ASSERT(marked_for_write_or_computed());
      return set_min_value_with_warn(ErrConvTime(ltime));
    }

/*** Field conversion routines ***/
    int store_field(Field *from) override
    {
      // INSERT INTO t1 (fbt_field) SELECT different_field_type FROM t2;
      return from->save_in_field(this);
    }
    int save_in_field(Field *to) override
    {
      // INSERT INTO t2 (different_field_type) SELECT fbt_field FROM t1;
      if (to->charset() == &my_charset_bin &&
          dynamic_cast<const Type_handler_general_purpose_string*>
            (to->type_handler()))
      {
        NativeBuffer<FbtImpl::binary_length()+1> res;
        val_native(&res);
        return to->store(res.ptr(), res.length(), &my_charset_bin);
      }
      return save_in_field_str(to);
    }
    Copy_func *get_copy_func(const Field *from) const override
    {
      // ALTER to FBT from another field
      return do_field_string;
    }

Copy_func *get_copy_func_to(const Field *to) const override
    {
      if (type_handler() == to->type_handler())
      {
        // ALTER from FBT to FBT
        DBUG_ASSERT(pack_length() == to->pack_length());
        DBUG_ASSERT(charset() == to->charset());
        DBUG_ASSERT(sort_charset() == to->sort_charset());
        return Field::do_field_eq;
      }
      // ALTER from FBT to another fbt type
      if (to->charset() == &my_charset_bin &&
          dynamic_cast<const Type_handler_general_purpose_string*>
            (to->type_handler()))
      {
        /*
          ALTER from FBT to a binary string type, e.g.:
            BINARY, TINYBLOB, BLOB, MEDIUMBLOB, LONGBLOB
        */
        return do_field_fbt_native_to_binary;
      }
      return do_field_string;
    }

static void do_field_fbt_native_to_binary(Copy_field *copy)
    {
      NativeBuffer<FbtImpl::binary_length()+1> res;
      copy->from_field->val_native(&res);
      copy->to_field->store(res.ptr(), res.length(), &my_charset_bin);
    }

bool memcpy_field_possible(const Field *from) const override
    {
      // INSERT INTO t1 (fbt_field) SELECT field2 FROM t2;
      return type_handler() == from->type_handler();
    }
    enum_conv_type rpl_conv_type_from(const Conv_source &source,
                                      const Relay_log_info *rli,
                                      const Conv_param &param) const override
    {
      if (type_handler() == source.type_handler() ||
          (source.type_handler() == &type_handler_string &&
           source.type_handler()->max_display_length_for_field(source) ==
           FbtImpl::binary_length()))
        return rpl_conv_type_from_same_data_type(source.metadata(), rli, param);
      return CONV_TYPE_IMPOSSIBLE;
    }

/*** Optimizer routines ***/
    bool test_if_equality_guarantees_uniqueness(const Item *const_item) const override
    {
      /*
        This condition:
          WHERE fbt_field=const
        should return a single distinct value only,
        as comparison is done according to FBT.
      */
      return true;
    }
    bool can_be_substituted_to_equal_item(const Context &ctx,
                                          const Item_equal *item_equal)
                                          override
    {
      switch (ctx.subst_constraint()) {
      case ANY_SUBST:
        return ctx.compare_type_handler() == item_equal->compare_type_handler();
      case IDENTITY_SUBST:
        return true;
      }
      return false;
    }
    Item *get_equal_const_item(THD *thd, const Context &ctx,
                               Item *const_item) override
    {
      Fbt_null tmp(const_item);
      if (tmp.is_null())
        return NULL;
      return new (thd->mem_root) Item_literal_fbt(thd, tmp);
    }
    Data_type_compatibility can_optimize_keypart_ref(const Item_bool_func *cond,
                                                     const Item *item)
                                                     const override
    {
      /*
        Mixing of two different non-traditional types is currently prevented.
        This may change in the future.
      */
      DBUG_ASSERT(item->type_handler()->type_handler_base_or_self()->
                  is_traditional_scalar_type() ||
                  item->type_handler()->type_collection() ==
                  type_handler()->type_collection());
      return Data_type_compatibility::OK;
    }
    /**
      Test if Field can use range optimizer for a standard comparison operation:
        <=, <, =, <=>, >, >=
      Note, this method does not cover spatial operations.
    */
    Data_type_compatibility can_optimize_range(const Item_bool_func *cond,
                                               const Item *item,
                                               bool is_eq_func) const override
    {
      // See the DBUG_ASSERT comment in can_optimize_keypart_ref()
      DBUG_ASSERT(item->type_handler()->type_handler_base_or_self()->
                  is_traditional_scalar_type() ||
                  item->type_handler()->type_collection() ==
                  type_handler()->type_collection());
      return Data_type_compatibility::OK;
    }
    void hash_not_null(Hasher *hasher) override
    {
      FbtImpl::hash_record(ptr, hasher);
    }
    SEL_ARG *get_mm_leaf(RANGE_OPT_PARAM *prm, KEY_PART *key_part,
                         const Item_bool_func *cond,
                         scalar_comparison_op op, Item *value) override
    {
      DBUG_ENTER("Field_fbt::get_mm_leaf");
      if (can_optimize_scalar_range(prm, key_part, cond, op, value) !=
          Data_type_compatibility::OK)
        DBUG_RETURN(0);
      int err= value->save_in_field_no_warnings(this, 1);
      if ((op != SCALAR_CMP_EQUAL && is_real_null()) || err < 0)
        DBUG_RETURN(&null_element);
      if (err > 0)
      {
        if (op == SCALAR_CMP_EQ || op == SCALAR_CMP_EQUAL)
          DBUG_RETURN(new (prm->mem_root) SEL_ARG_IMPOSSIBLE(this));
        DBUG_RETURN(NULL); /*  Cannot infer anything */
      }
      DBUG_RETURN(stored_field_make_mm_leaf(prm, key_part, op, value));
    }
    Data_type_compatibility can_optimize_hash_join(const Item_bool_func *cond,
                                                   const Item *item)
                                                   const override
    {
      return can_optimize_keypart_ref(cond, item);
    }
    Data_type_compatibility can_optimize_group_min_max(
                                    const Item_bool_func *cond,
                                    const Item *const_item) const override
    {
      return Data_type_compatibility::OK;
    }

uint row_pack_length() const override { return pack_length(); }

Binlog_type_info binlog_type_info() const override
    {
      DBUG_ASSERT(type() == binlog_type());
      return Binlog_type_info_fixed_string(Field_fbt::binlog_type(),
                                           FbtImpl::binary_length(), &my_charset_bin);
    }

uchar *pack(uchar *to, const uchar *from, uint max_length) override
    {
      DBUG_PRINT("debug", ("Packing field '%s'", field_name.str));
      return FbtImpl::pack(to, from, max_length);
    }

const uchar *unpack(uchar *to, const uchar *from, const uchar *from_end,
                        uint param_data) override
    {
      return FbtImpl::unpack(to, from, from_end, param_data);
    }

uint max_packed_col_length(uint max_length) override
    {
      return StringPack::max_packed_col_length(max_length);
    }

uint packed_col_length(const uchar *fbt_ptr, uint length) override
    {
      return StringPack::packed_col_length(fbt_ptr, length);
    }

uint size_of() const override { return sizeof(*this); }
  };

class cmp_item_fbt: public cmp_item_scalar
  {
    Fbt m_native;
  public:
    cmp_item_fbt()
     :cmp_item_scalar(),
      m_native(Fbt::zero())
    { }
    void store_value(Item *item) override
    {
      m_native= Fbt(item, &m_null_value);
    }
    int cmp_not_null(const Value *val) override
    {
      DBUG_ASSERT(!val->is_null());
      DBUG_ASSERT(val->is_string());
      Fbt_null tmp(val->m_string);
      DBUG_ASSERT(!tmp.is_null());
      return m_native.cmp(tmp);
    }
    int cmp(Item *arg) override
    {
      Fbt_null tmp(arg);
      return m_null_value || tmp.is_null() ? UNKNOWN : m_native.cmp(tmp) != 0;
    }
    int compare(const cmp_item *ci) const override
    {
      const cmp_item_fbt *tmp= static_cast<const cmp_item_fbt*>(ci);
      DBUG_ASSERT(!m_null_value);
      DBUG_ASSERT(!tmp->m_null_value);
      return m_native.cmp(tmp->m_native);
    }
    cmp_item *make_same(THD *thd) override
    {
      return new (thd->mem_root) cmp_item_fbt();
    }
  };

class in_fbt :public in_vector
  {
    Fbt m_value;
    static int cmp_fbt(void *cmp_arg, const void *a, const void *b)
    {
      return static_cast<const Fbt*>(a)->cmp(*static_cast<const Fbt*>(b));
    }
  public:
    in_fbt(THD *thd, uint elements)
     :in_vector(thd, elements, sizeof(Fbt), cmp_fbt, 0),
      m_value(Fbt::zero())
    { }
    const Type_handler *type_handler() const override
    {
      return singleton();
    }
    bool set(uint pos, Item *item) override
    {
      Fbt *buff= &((Fbt *) base)[pos];
      Fbt_null value(item);
      if (value.is_null())
      {
        *buff= Fbt::zero();
        return true;
      }
      *buff= value;
      return false;
    }
    uchar *get_value(Item *item) override
    {
      Fbt_null value(item);
      if (value.is_null())
        return 0;
      m_value= value;
      return (uchar *) &m_value;
    }
    Item* create_item(THD *thd) override
    {
      return new (thd->mem_root) Item_literal_fbt(thd);
    }
    void value_to_item(uint pos, Item *item) override
    {
      const Fbt &buff= (((Fbt*) base)[pos]);
      static_cast<Item_literal_fbt*>(item)->set_value(buff);
    }
  };

class Item_copy_fbt: public Item_copy
  {
    NativeBuffer<Fbt::binary_length()+1> m_value;
  public:
    Item_copy_fbt(THD *thd, Item *item_arg): Item_copy(thd, item_arg) {}

bool val_native(THD *thd, Native *to) override
    {
      if (null_value)
        return true;
      return to->copy(m_value.ptr(), m_value.length());
    }
    String *val_str(String *to) override
    {
      if (null_value)
        return NULL;
      Fbt_null tmp(m_value.ptr(), m_value.length());
      return tmp.is_null() || tmp.to_string(to) ? NULL : to;
    }
    my_decimal *val_decimal(my_decimal *to) override
    {
      my_decimal_set_zero(to);
      return to;
    }
    double val_real() override
    {
      return 0;
    }
    longlong val_int() override
    {
      return 0;
    }
    bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) override
    {
      set_zero_time(ltime, MYSQL_TIMESTAMP_TIME);
      return null_value;
    }
    void copy() override
    {
      null_value= item->val_native(current_thd, &m_value);
      DBUG_ASSERT(null_value == item->null_value);
    }
    int save_in_field(Field *field, bool no_conversions) override
    {
      return Item::save_in_field(field, no_conversions);
    }

protected:
    Item *shallow_copy(THD *thd) const override
    { return get_item_copy<Item_copy_fbt>(thd, this); }
    Item *deep_copy(THD *thd) const override
    { return shallow_copy_with_checks(thd); }
  };

class Item_char_typecast_func_handler_fbt_to_binary:
                                         public Item_handled_func::Handler_str
  {
  public:
    const Type_handler *return_type_handler(const Item_handled_func *item)
                                            const override
    {
      if (item->max_length > MAX_FIELD_VARCHARLENGTH)
        return Type_handler::blob_type_handler(item->max_length);
      if (item->max_length > 255)
        return &type_handler_varchar;
      return &type_handler_string;
    }
    bool fix_length_and_dec(Item_handled_func *xitem) const override
    {
      return false;
    }
    String *val_str(Item_handled_func *item, String *to) const override
    {
      DBUG_ASSERT(dynamic_cast<const Item_char_typecast*>(item));
      return static_cast<Item_char_typecast*>(item)->
               val_str_binary_from_native(to);
    }
  };

class Item_typecast_fbt: public Item_func
  {
  public:
    Item_typecast_fbt(THD *thd, Item *a) :Item_func(thd, a) {}

const Type_handler *type_handler() const override
    { return singleton(); }

enum Functype functype() const override { return CHAR_TYPECAST_FUNC; }
    bool eq(const Item *item, const Eq_config &config) const override
    {
      if (this == item)
        return true;
      if (item->type() != FUNC_ITEM ||
          functype() != ((Item_func*)item)->functype())
        return false;
      if (type_handler() != item->type_handler())
        return false;
      Item_typecast_fbt *cast= (Item_typecast_fbt*) item;
      return args[0]->eq(cast->args[0], config);
    }
    LEX_CSTRING func_name_cstring() const override
    {
      static Name name= singleton()->name();
      size_t len= 9+name.length()+1;
      char *buf= (char*)current_thd->alloc(len);
      strmov(strmov(buf, "cast_as_"), name.ptr());
      return { buf, len };
    }
    void print(String *str, enum_query_type query_type) override
    {
      str->append(STRING_WITH_LEN("cast("));
      args[0]->print(str, query_type);
      str->append(STRING_WITH_LEN(" as "));
      str->append(singleton()->name().lex_cstring());
      str->append(')');
    }
    bool fix_length_and_dec(THD *thd) override
    {
      Type_std_attributes::operator=(Type_std_attributes_fbt());
      if (Fbt::fix_fields_maybe_null_on_conversion_to_fbt(args[0]))
        set_maybe_null();
      return false;
    }
    String *val_str(String *to) override
    {
      Fbt_null tmp(args[0]);
      return (null_value= tmp.is_null() || tmp.to_string(to)) ? NULL : to;
    }
    longlong val_int() override
    {
      return 0;
    }
    double val_real() override
    {
      return 0;
    }
    my_decimal *val_decimal(my_decimal *to) override
    {
      my_decimal_set_zero(to);
      return to;
    }
    bool get_date(THD *thd, MYSQL_TIME *ltime, date_mode_t fuzzydate) override
    {
      set_zero_time(ltime, MYSQL_TIMESTAMP_TIME);
      return false;
    }
    bool val_native(THD *thd, Native *to) override
    {
      Fbt_null tmp(args[0]);
      return null_value= tmp.is_null() || tmp.to_native(to);
    }

protected:
    Item *shallow_copy(THD *thd) const override
    { return get_item_copy<Item_typecast_fbt>(thd, this); }
  };

class Item_cache_fbt: public Item_cache
  {
    NativeBuffer<FbtImpl::binary_length()+1> m_value;
  public:
    Item_cache_fbt(THD *thd)
     :Item_cache(thd, singleton()) { }
    bool cache_value() override
    {
      if (!example)
        return false;
      value_cached= true;
      null_value_inside= null_value=
        example->val_native_with_conversion_result(current_thd,
                                                   &m_value, type_handler());
      return true;
    }
    String* val_str(String *to) override
    {
      if (!has_value())
        return NULL;
      Fbt_null tmp(m_value.ptr(), m_value.length());
      return tmp.is_null() || tmp.to_string(to) ? NULL : to;
    }
    my_decimal *val_decimal(my_decimal *to) override
    {
      if (!has_value())
        return NULL;
      my_decimal_set_zero(to);
      return to;
    }
    longlong val_int() override
    {
      if (!has_value())
        return 0;
      return 0;
    }
    double val_real() override
    {
      if (!has_value())
        return 0;
      return 0;
    }
    longlong val_datetime_packed(THD *) override
    {
      DBUG_ASSERT(0);
      if (!has_value())
        return 0;
      return 0;
    }
    longlong val_time_packed(THD *) override
    {
      DBUG_ASSERT(0);
      if (!has_value())
        return 0;
      return 0;
    }
    bool get_date(THD *, MYSQL_TIME *ltime, date_mode_t) override
    {
      if (!has_value())
        return true;
      set_zero_time(ltime, MYSQL_TIMESTAMP_TIME);
      return false;
    }
    bool val_native(THD *, Native *to) override
    {
      if (!has_value())
        return true;
      return to->copy(m_value.ptr(), m_value.length());
    }

protected:
    Item *shallow_copy(THD *thd) const override
    { return get_item_copy<Item_cache_fbt>(thd, this); }
    Item *deep_copy(THD *thd) const override
    { return shallow_copy_with_checks(thd); }
  };

/* =[ methods ]=============================================== */
private:

bool character_or_binary_string_to_native(THD *thd, const String *str,
                                            Native *to) const
  {
    if (str->charset() == &my_charset_bin)
    {
      // Convert from a binary string
      if (str->length() != FbtImpl::binary_length() ||
          to->copy(str->ptr(), str->length()))
      {
        thd->push_warning_wrong_value(Sql_condition::WARN_LEVEL_WARN,
                                      name().ptr(), ErrConvString(str).ptr());
        return true;
      }
      return false;
    }
    // Convert from a character string
    Fbt_null tmp(*str);
    if (tmp.is_null())
      thd->push_warning_wrong_value(Sql_condition::WARN_LEVEL_WARN,
                                    name().ptr(), ErrConvString(str).ptr());
    return tmp.is_null() || tmp.to_native(to);
  }

public:
  ~Type_handler_fbt() override {}

const Type_collection *type_collection() const override
  {
    return TypeCollectionImpl::singleton();
  }

const Name &default_value() const override
  {
    return FbtImpl::default_value();
  }
  ulong KEY_pack_flags(uint column_nr) const override
  {
    return FbtImpl::KEY_pack_flags(column_nr);
  }
  protocol_send_type_t protocol_send_type() const override
  {
    return PROTOCOL_SEND_STRING;
  }
  bool Item_append_extended_type_info(Send_field_extended_metadata *to,
                                      const Item *item) const override
  {
    return to->set_data_type_name(name().lex_cstring());
  }

enum_field_types field_type() const override
  {
    return MYSQL_TYPE_STRING;
  }

Item_result result_type() const override
  {
    return STRING_RESULT;
  }

Item_result cmp_type() const override
  {
    return STRING_RESULT;
  }

enum_dynamic_column_type dyncol_type(const Type_all_attributes *attr)
                                       const override
  {
    return DYN_COL_STRING;
  }

uint32 max_display_length_for_field(const Conv_source &src) const override
  {
    return FbtImpl::max_char_length();
  }

const Type_handler *type_handler_for_implicit_upgrade() const override
  {
    return TypeCollectionImpl::singleton()->
             type_handler_for_implicit_upgrade(this);
  }
  const Type_handler *type_handler_for_comparison() const override
  {
    return this;
  }

int stored_field_cmp_to_item(THD *thd, Field *field, Item *item) const override
  {
    DBUG_ASSERT(field->type_handler() == this);
    Fbt_null ni(item); // Convert Item to Fbt
    if (ni.is_null())
      return 0;
    NativeBuffer<FbtImpl::binary_length()+1> tmp;
    if (field->val_native(&tmp))
    {
      DBUG_ASSERT(0);
      return 0;
    }
    return -ni.cmp(tmp);
  }
  CHARSET_INFO *charset_for_protocol(const Item *item) const override
  {
    return item->collation.collation;
  }

bool is_scalar_type() const override { return true; }
  bool is_val_native_ready() const override { return true; }
  bool can_return_int() const override { return false; }
  bool can_return_decimal() const override { return false; }
  bool can_return_real() const override { return false; }
  bool can_return_str() const override { return true; }
  bool can_return_text() const override { return true; }
  bool can_return_date() const override { return false; }
  bool can_return_time() const override { return false; }
  bool convert_to_binary_using_val_native() const override { return true; }

decimal_digits_t  Item_time_precision(THD *thd, Item *item) const override
  {
    return 0;
  }
  decimal_digits_t Item_datetime_precision(THD *thd, Item *item) const override
  {
    return 0;
  }
  decimal_digits_t Item_decimal_scale(const Item *item) const override
  {
    return 0;
  }
  decimal_digits_t  Item_decimal_precision(const Item *item) const override
  {
    /* This will be needed if we ever allow cast from Fbt to DECIMAL. */
    return (FbtImpl::binary_length()*8+7)/10*3; // = bytes to decimal digits
  }

/*
    Returns how many digits a divisor adds into a division result.
    See Item::divisor_precision_increment() in item.h for more comments.
  */
  decimal_digits_t Item_divisor_precision_increment(const Item *) const override
  {
    return 0;
  }
  /**
    Makes a temporary table Field to handle numeric aggregate functions,
    e.g. SUM(DISTINCT expr), AVG(DISTINCT expr), etc.
  */
  Field *make_num_distinct_aggregator_field(MEM_ROOT *, const Item *) const override
  {
    DBUG_ASSERT(0);
    return 0;
  }
  Field *make_conversion_table_field(MEM_ROOT *root, TABLE *table, uint metadata,
                                     const Field *target) const override
  {
    const Record_addr tmp(NULL, Bit_addr(true));
    return new (table->in_use->mem_root) Field_fbt(&empty_clex_str, tmp);
  }
  // Fix attributes after the parser
  bool Column_definition_fix_attributes(Column_definition *c) const override
  {
    c->length= FbtImpl::max_char_length();
    return false;
  }

bool Column_definition_prepare_stage1(THD *, MEM_ROOT *,
                                        Column_definition *def,
                                        column_definition_type_t,
                                        const Column_derived_attributes *)
                                        const override
  {
    def->prepare_stage1_simple(&my_charset_numeric);
    return false;
  }

bool Column_definition_redefine_stage1(Column_definition *def,
                                         const Column_definition *dup,
                                         const handler *file) const override
  {
    def->redefine_stage1_common(dup, file);
    def->set_compression_method(dup->compression_method());
    def->create_length_to_internal_length_string();
    return false;
  }

bool Column_definition_prepare_stage2(Column_definition *def, handler *file,
                                        ulonglong table_flags) const override
  {
    def->pack_flag= FIELDFLAG_BINARY;
    return false;
  }

bool partition_field_check(const LEX_CSTRING &field_name,
                             Item *item_expr) const override
  {
    if (item_expr->cmp_type() != STRING_RESULT)
    {
      my_error(ER_WRONG_TYPE_COLUMN_VALUE_ERROR, MYF(0));
      return true;
    }
    return false;
  }

bool partition_field_append_value(String *to, Item *item_expr,
                                    CHARSET_INFO *field_cs,
                                    partition_value_print_mode_t mode)
                                    const override
  {
    StringBuffer<FbtImpl::max_char_length()+64> fbtstr;
    Fbt_null fbt(item_expr);
    if (fbt.is_null())
    {
      my_error(ER_PARTITION_FUNCTION_IS_NOT_ALLOWED, MYF(0));
      return true;
    }
    return fbt.to_string(&fbtstr) ||
           to->append('\'') ||
           to->append(fbtstr) ||
           to->append('\'');
  }

Field *make_table_field(MEM_ROOT *root, const LEX_CSTRING *name,
                          const Record_addr &addr,
                          const Type_all_attributes &attr,
                          TABLE_SHARE *table) const override
  {
    return new (root) Field_fbt(name, addr);
  }

Field * make_table_field_from_def(TABLE_SHARE *share, MEM_ROOT *mem_root,
                            const LEX_CSTRING *name, const Record_addr &addr,
                            const Bit_addr &bit,
                            const Column_definition_attributes *attr,
                            uint32 flags) const override
  {
    return new (mem_root) Field_fbt(name, addr);
  }
  void Column_definition_attributes_frm_pack(const Column_definition_attributes *def,
                                        uchar *buff) const override
  {
    def->frm_pack_basic(buff);
    def->frm_pack_charset(buff);
  }
  bool Column_definition_attributes_frm_unpack(Column_definition_attributes *def,
                                          TABLE_SHARE *share, const uchar *buffer,
                                          LEX_CUSTRING *gis_options)
                                          const override
  {
    def->frm_unpack_basic(buffer);
    return def->frm_unpack_charset(share, buffer);
  }
  void make_sort_key_part(uchar *to, Item *item, const SORT_FIELD_ATTR *sort_field,
                          String *) const override
  {
    DBUG_ASSERT(item->type_handler() == this);
    NativeBuffer<FbtImpl::binary_length()+1> tmp;
    item->val_native_result(current_thd, &tmp);
    if (item->maybe_null())
    {
      if (item->null_value)
      {
        memset(to, 0, FbtImpl::binary_length() + 1);
        return;
      }
      *to++= 1;
    }
    DBUG_ASSERT(!item->null_value);
    DBUG_ASSERT(FbtImpl::binary_length() == tmp.length());
    DBUG_ASSERT(FbtImpl::binary_length() == sort_field->length);
    FbtImpl::memory_to_record((char*) to, tmp.ptr());
  }
  uint make_packed_sort_key_part(uchar *to, Item *item,
                                 const SORT_FIELD_ATTR *sort_field,
                                 String *) const override
  {
    DBUG_ASSERT(item->type_handler() == this);
    NativeBuffer<FbtImpl::binary_length()+1> tmp;
    item->val_native_result(current_thd, &tmp);
    if (item->maybe_null())
    {
      if (item->null_value)
      {
        *to++=0;
        return 0;
      }
      *to++= 1;
    }
    DBUG_ASSERT(!item->null_value);
    DBUG_ASSERT(FbtImpl::binary_length() == tmp.length());
    DBUG_ASSERT(FbtImpl::binary_length() == sort_field->length);
    FbtImpl::memory_to_record((char*) to, tmp.ptr());
    return tmp.length();
  }
  void sort_length(THD *thd, const Type_std_attributes *item,
                  SORT_FIELD_ATTR *attr) const override
  {
    attr->original_length= attr->length= FbtImpl::binary_length();
    attr->suffix_length= 0;
  }
  uint32 max_display_length(const Item *item) const override
  {
    return FbtImpl::max_char_length();
  }
  uint32 calc_pack_length(uint32 length) const override
  {
    return FbtImpl::binary_length();
  }
  void Item_update_null_value(Item *item) const override
  {
    NativeBuffer<FbtImpl::binary_length()+1> tmp;
    item->val_native(current_thd, &tmp);
  }
  bool Item_save_in_value(THD *thd, Item *item, st_value *value) const override
  {
    value->m_type= DYN_COL_STRING;
    String *str= item->val_str(&value->m_string);
    if (str != &value->m_string && !item->null_value)
    {
      // "item" returned a non-NULL value
      if (Fbt_null(*str).is_null())
      {
        /*
          The value was not-null, but conversion to FBT failed:
            SELECT a, DECODE_ORACLE(fbtcol, 'garbage', '<NULL>', '::01', '01')
            FROM t1;
        */
        thd->push_warning_wrong_value(Sql_condition::WARN_LEVEL_WARN,
                                      name().ptr(), ErrConvString(str).ptr());
        value->m_type= DYN_COL_NULL;
        return true;
      }
      // "item" returned a non-NULL value, and it was a valid FBT
      value->m_string.set(str->ptr(), str->length(), str->charset());
    }
    return check_null(item, value);
  }
  void Item_param_setup_conversion(THD *thd, Item_param *param) const override
  {
    param->setup_conversion_string(thd, thd->variables.character_set_client);
  }
  void Item_param_set_param_func(Item_param *param,
                                 uchar **pos, ulong len) const override
  {
    param->set_param_str(pos, len);
  }
  bool Item_param_set_from_value(THD *thd, Item_param *param,
                                 const Type_all_attributes *attr,
                                 const st_value *val) const override
  {
    param->unsigned_flag= false;
    param->setup_conversion_string(thd, attr->collation.collation);
    /*
      Exact value of max_length is not known unless fbt is converted to
      charset of connection, so we have to set it later.
    */
    return param->set_str(val->m_string.ptr(), val->m_string.length(),
                          attr->collation.collation,
                          attr->collation.collation);
  }
  bool Item_param_val_native(THD *thd, Item_param *item, Native *to)
                             const override
  {
    StringBuffer<FbtImpl::max_char_length()+1> buffer;
    String *str= item->val_str(&buffer);
    if (!str)
      return true;
    Fbt_null tmp(*str);
    return tmp.is_null() || tmp.to_native(to);
  }
  bool Item_send(Item *item, Protocol *p, st_value *buf) const override
  {
    return Item_send_str(item, p, buf);
  }
  int Item_save_in_field(Item *item, Field *field, bool no_conversions)
                         const override
  {
    if (field->type_handler() == this)
    {
      NativeBuffer<MAX_FIELD_WIDTH> tmp;
      bool rc= item->val_native(current_thd, &tmp);
      if (rc || item->null_value)
        return set_field_to_null_with_conversions(field, no_conversions);
      field->set_notnull();
      return field->store_native(tmp);
    }
    return item->save_str_in_field(field, no_conversions);
  }

String *print_item_value(THD *thd, Item *item, String *str) const override
  {
    StringBuffer<FbtImpl::max_char_length()+64> buf;
    String *result= item->val_str(&buf);
    /*
      TODO: This should eventually use one of these notations:
      1. CAST('xxx' AS Fbt)
         Problem: CAST is not supported as a NAME_CONST() argument.
      2. Fbt'xxx'
         Problem: This syntax is not supported by the parser yet.
    */
    return !result || str->realloc(result->length() + 2) ||
           str->append(STRING_WITH_LEN("'")) ||
           str->append(result->ptr(), result->length()) ||
           str->append(STRING_WITH_LEN("'")) ? nullptr : str;
  }

/**
    Check if
      WHERE expr=value AND expr=const
    can be rewritten as:
      WHERE const=value AND expr=const

"this" is the comparison handler that is used by "target".

@param target       - the predicate expr=value,
                          whose "expr" argument will be replaced to "const".
    @param target_expr  - the target's "expr" which will be replaced to "const".
    @param target_value - the target's second argument, it will remain unchanged.
    @param source       - the equality predicate expr=const (or expr<=>const)
                          that can be used to rewrite the "target" part
                          (under certain conditions, see the code).
    @param source_expr  - the source's "expr". It should be exactly equal to
                          the target's "expr" to make condition rewrite possible.
    @param source_const - the source's "const" argument, it will be inserted
                          into "target" instead of "expr".
  */
  bool can_change_cond_ref_to_const(Item_bool_func2 *target, Item *target_expr,
                               Item *target_value, Item_bool_func2 *source,
                               Item *source_expr, Item *source_const)
                               const override
  {
    /*
      WHERE COALESCE(col)='xxx' AND COALESCE(col)=CONCAT(a);  -->
      WHERE COALESCE(col)='xxx' AND         'xxx'=CONCAT(a);
    */
    return target->compare_type_handler() == source->compare_type_handler();
  }
  bool subquery_type_allows_materialization(const Item *inner,
                                       const Item *outer, bool) const override
  {
    /*
      Example:
        SELECT * FROM t1 WHERE a IN (SELECT col FROM t1 GROUP BY col);
      Allow materialization only if the outer column is also FBT.
      This can be changed for more relaxed rules in the future.
    */
    DBUG_ASSERT(inner->type_handler() == this);
    return outer->type_handler() == this;
  }
  /**
    Make a simple constant replacement item for a constant "src",
    so the new item can futher be used for comparison with "cmp", e.g.:
      src = cmp   ->  replacement = cmp

"this" is the type handler that is used to compare "src" and "cmp".

@param thd - current thread, for mem_root
    @param src - The item that we want to replace. It's a const item,
                 but it can be complex enough to calculate on every row.
    @param cmp - The src's comparand.
    @retval    - a pointer to the created replacement Item
    @retval    - NULL, if could not create a replacement (e.g. on EOM).
                 NULL is also returned for ROWs, because instead of replacing
                 a Item_row to a new Item_row, Type_handler_row just replaces
                 its elements.
  */
  Item *make_const_item_for_comparison(THD *thd, Item *src,
                                       const Item *cmp) const override
  {
    Fbt_null tmp(src);
    if (tmp.is_null())
      return new (thd->mem_root) Item_null(thd, src->name.str);
    return new (thd->mem_root) Item_literal_fbt(thd, tmp);
  }
  Item_cache *Item_get_cache(THD *thd, const Item *item) const override
  {
    return new (thd->mem_root) Item_cache_fbt(thd);
  }

Item *create_typecast_item(THD *thd, Item *item,
                             const Type_cast_attributes &attr) const override
  {
    return new (thd->mem_root) Item_typecast_fbt(thd, item);
  }
  Item_copy *create_item_copy(THD *thd, Item *item) const override
  {
    return new (thd->mem_root) Item_copy_fbt(thd, item);
  }
  int cmp_native(const Native &a, const Native &b) const override
  {
    return FbtImpl::cmp(a.to_lex_cstring(), b.to_lex_cstring());
  }
  bool set_comparator_func(THD *thd, Arg_comparator *cmp) const override
  {
    return cmp->set_cmp_func_native(thd);
  }
  bool Item_const_eq(const Item_const *a, const Item_const *b,
                             bool binary_cmp) const override
  {
    return false;
  }
  bool Item_eq_value(THD *thd, const Type_cmp_attributes *attr,
                     Item *a, Item *b) const override
  {
    Fbt_null na(a), nb(b);
    return !na.is_null() && !nb.is_null() && !na.cmp(nb);
  }
  bool Item_bool_rowready_func2_fix_length_and_dec(THD *thd,
                                 Item_bool_rowready_func2 *func) const override
  {
    if (Type_handler::Item_bool_rowready_func2_fix_length_and_dec(thd, func))
      return true;
    if (!func->maybe_null() &&
        Fbt::fix_fields_maybe_null_on_conversion_to_fbt(func->arguments(), 2))
      func->set_maybe_null();
    return false;
  }
  bool Item_hybrid_func_fix_attributes(THD *thd, const LEX_CSTRING &name,
                                       Type_handler_hybrid_field_type *h,
                                       Type_all_attributes *attr,
                                       Item **items, uint nitems) const override
  {
    attr->Type_std_attributes::operator=(Type_std_attributes_fbt());
    h->set_handler(this);
    /*
      If some of the arguments cannot be safely converted to "FBT NOT NULL",
      then mark the entire function nullability as NULL-able.
      Otherwise, keep the generic nullability calculated by earlier stages:
      - either by the most generic way in Item_func::fix_fields()
      - or by Item_func_xxx::fix_length_and_dec() before the call of
        Item_hybrid_func_fix_attributes()
      IFNULL and COALESCE are special-
      If the first non-null arg can be safely converted to result type,
      the result is guaranteed to be NOT NULL
    */
    bool not_null_on_conversion= false;
    if (dynamic_cast<Item_func_ifnull*>(attr) ||
        dynamic_cast<Item_func_coalesce*>(attr))
    {
      for (uint i= 0; i< nitems; i++)
      {
        if (!items[i]->maybe_null() &&
            !Fbt::fix_fields_maybe_null_on_conversion_to_fbt(items[i]))
        {
          not_null_on_conversion= true;
          break;
        }
      }
    }
    else
    {
      not_null_on_conversion= true;
      for (uint i= 0; i < nitems; i++)
      {
        if (Fbt::fix_fields_maybe_null_on_conversion_to_fbt(items[i]))
        {
          not_null_on_conversion= false;
          break;
        }
      }
    }
    if (not_null_on_conversion)
      attr->set_type_maybe_null(false);
    else
      attr->set_type_maybe_null(true);
    return false;
  }
  bool Item_func_min_max_fix_attributes(THD *thd, Item_func_min_max *func,
                                        Item **items, uint nitems) const override
  {
    return Item_hybrid_func_fix_attributes(thd, func->func_name_cstring(),
                                           func, func, items, nitems);

}
  bool Item_sum_hybrid_fix_length_and_dec(Item_sum_hybrid *func) const override
  {
    func->Type_std_attributes::operator=(Type_std_attributes_fbt());
    func->set_handler(this);
    return false;
  }
  bool Item_sum_sum_fix_length_and_dec(Item_sum_sum *func) const override
  {
    return Item_func_or_sum_illegal_param(func);
  }
  bool Item_sum_avg_fix_length_and_dec(Item_sum_avg *func) const override
  {
    return Item_func_or_sum_illegal_param(func);
  }
  bool Item_sum_variance_fix_length_and_dec(Item_sum_variance *func) const override
  {
    return Item_func_or_sum_illegal_param(func);
  }

bool Item_val_native_with_conversion(THD *thd, Item *item,
                                       Native *to) const override
  {
    if (item->type_handler() == this)
      return item->val_native(thd, to); // No conversion needed
    StringBuffer<FbtImpl::max_char_length()+1> buffer;
    String *str= item->val_str(&buffer);
    return str ? character_or_binary_string_to_native(thd, str, to) : true;
  }
  bool Item_val_native_with_conversion_result(THD *thd, Item *item,
                                              Native *to) const override
  {
    if (item->type_handler() == this)
      return item->val_native_result(thd, to); // No conversion needed
    StringBuffer<FbtImpl::max_char_length()+1> buffer;
    String *str= item->str_result(&buffer);
    return str ? character_or_binary_string_to_native(thd, str, to) : true;
  }

bool Item_val_bool(Item *item) const override
  {
    NativeBuffer<FbtImpl::binary_length()+1> tmp;
    if (item->val_native(current_thd, &tmp))
      return false;
    return !Fbt::only_zero_bytes(tmp.ptr(), tmp.length());
  }
  void Item_get_date(THD *thd, Item *item, Temporal::Warn *buff,
                     MYSQL_TIME *ltime, date_mode_t fuzzydate) const override
  {
    set_zero_time(ltime, MYSQL_TIMESTAMP_TIME);
  }

longlong Item_val_int_signed_typecast(Item *item) const override
  {
    DBUG_ASSERT(0);
    return 0;
  }

longlong Item_val_int_unsigned_typecast(Item *item) const override
  {
    DBUG_ASSERT(0);
    return 0;
  }

String *Item_func_hex_val_str_ascii(Item_func_hex *item, String *str)
                                      const override
  {
    NativeBuffer<FbtImpl::binary_length()+1> tmp;
    if ((item->null_value= item->arguments()[0]->val_native(current_thd, &tmp)))
      return nullptr;
    DBUG_ASSERT(tmp.length() == FbtImpl::binary_length());
    if (str->set_hex(tmp.ptr(), tmp.length()))
    {
      str->length(0);
      str->set_charset(item->collation.collation);
    }
    return str;
  }

String *Item_func_hybrid_field_type_val_str(Item_func_hybrid_field_type *item,
                                              String *str) const override
  {
    NativeBuffer<FbtImpl::binary_length()+1> native;
    if (item->val_native(current_thd, &native))
    {
      DBUG_ASSERT(item->null_value);
      return nullptr;
    }
    DBUG_ASSERT(native.length() == FbtImpl::binary_length());
    Fbt_null tmp(native.ptr(), native.length());
    return tmp.is_null() || tmp.to_string(str) ? nullptr : str;
  }
  double Item_func_hybrid_field_type_val_real(Item_func_hybrid_field_type *)
                                              const override
  {
    return 0;
  }
  longlong Item_func_hybrid_field_type_val_int(Item_func_hybrid_field_type *)
                                               const override
  {
    return 0;
  }
  my_decimal *
  Item_func_hybrid_field_type_val_decimal(Item_func_hybrid_field_type *,
                                          my_decimal *to) const override
  {
    my_decimal_set_zero(to);
    return to;
  }
  void Item_func_hybrid_field_type_get_date(THD *,
                                            Item_func_hybrid_field_type *,
                                            Temporal::Warn *,
                                            MYSQL_TIME *to,
                                            date_mode_t fuzzydate)
                                            const override
  {
    set_zero_time(to, MYSQL_TIMESTAMP_TIME);
  }
  // WHERE is Item_func_min_max_val_native???
  String *Item_func_min_max_val_str(Item_func_min_max *func, String *str)
                                    const override
  {
    Fbt_null tmp(func);
    return tmp.is_null() || tmp.to_string(str) ? nullptr : str;
  }
  double Item_func_min_max_val_real(Item_func_min_max *) const override
  {
    return 0;
  }
  longlong Item_func_min_max_val_int(Item_func_min_max *) const override
  {
    return 0;
  }
  my_decimal *Item_func_min_max_val_decimal(Item_func_min_max *,
                                            my_decimal *to) const override
  {
    my_decimal_set_zero(to);
    return to;
  }
  bool Item_func_min_max_get_date(THD *thd, Item_func_min_max*, MYSQL_TIME *to,
                                  date_mode_t fuzzydate) const override
  {
    set_zero_time(to, MYSQL_TIMESTAMP_TIME);
    return false;
  }

bool Item_func_between_fix_length_and_dec(Item_func_between *func) const override
  {
    if (!func->maybe_null() &&
        Fbt::fix_fields_maybe_null_on_conversion_to_fbt(func->arguments(), 3))
      func->set_maybe_null();
    return false;
  }
  longlong Item_func_between_val_int(Item_func_between *func) const override
  {
    return func->val_int_cmp_native();
  }

cmp_item *make_cmp_item(THD *thd, CHARSET_INFO *cs) const override
  {
    return new (thd->mem_root) cmp_item_fbt;
  }

in_vector *make_in_vector(THD *thd, const Item_func_in *func,
                            uint nargs) const override
  {
    return new (thd->mem_root) in_fbt(thd, nargs);
  }

bool Item_func_in_fix_comparator_compatible_types(THD *thd,
                                                    Item_func_in *func)
                                                    const override
  {
    if (!func->maybe_null() &&
        Fbt::fix_fields_maybe_null_on_conversion_to_fbt(func->arguments(),
                                                        func->argument_count()))
      func->set_maybe_null();
    if (func->compatible_types_scalar_bisection_possible())
    {
      return func->value_list_convert_const_to_int(thd) ||
             func->fix_for_scalar_comparison_using_bisection(thd);
    }
    return
      func->fix_for_scalar_comparison_using_cmp_items(thd,
                                                      1U << (uint) STRING_RESULT);
  }
  bool Item_func_round_fix_length_and_dec(Item_func_round *func) const override
  {
    return Item_func_or_sum_illegal_param(func);
  }
  bool Item_func_int_val_fix_length_and_dec(Item_func_int_val *func) const override
  {
    return Item_func_or_sum_illegal_param(func);
  }

bool Item_func_abs_fix_length_and_dec(Item_func_abs *func) const override
  {
    return Item_func_or_sum_illegal_param(func);
  }

bool Item_func_neg_fix_length_and_dec(Item_func_neg *func) const override
  {
    return Item_func_or_sum_illegal_param(func);
  }

bool Item_func_signed_fix_length_and_dec(Item_func_signed *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_func_unsigned_fix_length_and_dec(Item_func_unsigned *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_double_typecast_fix_length_and_dec(Item_double_typecast *item)
                                          const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_float_typecast_fix_length_and_dec(Item_float_typecast *item)
                                         const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_decimal_typecast_fix_length_and_dec(Item_decimal_typecast *item)
                                           const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_char_typecast_fix_length_and_dec(Item_char_typecast *item)
                                             const override
  {
    if (item->cast_charset() == &my_charset_bin)
    {
      static Item_char_typecast_func_handler_fbt_to_binary
               item_char_typecast_func_handler_fbt_to_binary;
      item->fix_length_and_dec_native_to_binary(FbtImpl::binary_length());
      item->set_func_handler(&item_char_typecast_func_handler_fbt_to_binary);
      return false;
    }
    item->fix_length_and_dec_str();
    return false;
  }

bool Item_time_typecast_fix_length_and_dec(Item_time_typecast *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_date_typecast_fix_length_and_dec(Item_date_typecast *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_datetime_typecast_fix_length_and_dec(Item_datetime_typecast *item)
                                            const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_func_plus_fix_length_and_dec(Item_func_plus *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_func_minus_fix_length_and_dec(Item_func_minus *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_func_mul_fix_length_and_dec(Item_func_mul *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_func_div_fix_length_and_dec(Item_func_div *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }
  bool Item_func_mod_fix_length_and_dec(Item_func_mod *item) const override
  {
    return Item_func_or_sum_illegal_param(item);
  }

static Type_handler_fbt *singleton()
  {
    static Type_handler_fbt th;
    return &th;
  }
};

template<class FbtImpl>
class Type_collection_fbt: public Type_collection
{
  const Type_handler *aggregate_common(const Type_handler *a,
                                       const Type_handler *b) const
  {
    if (a == b)
      return a;
    return NULL;
  }
  const Type_handler *aggregate_if_string(const Type_handler *a,
                                          const Type_handler *b) const
  {
    static const Type_aggregator::Pair agg[]=
    {
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_null,        Type_handler_fbt<FbtImpl>::singleton()},
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_varchar,     Type_handler_fbt<FbtImpl>::singleton()},
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_string,      Type_handler_fbt<FbtImpl>::singleton()},
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_tiny_blob,   Type_handler_fbt<FbtImpl>::singleton()},
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_blob,        Type_handler_fbt<FbtImpl>::singleton()},
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_medium_blob, Type_handler_fbt<FbtImpl>::singleton()},
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_long_blob,   Type_handler_fbt<FbtImpl>::singleton()},
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_hex_hybrid,  Type_handler_fbt<FbtImpl>::singleton()},
      {NULL,NULL,NULL}
    };
    return Type_aggregator::find_handler_in_array(agg, a, b, true);
  }
public:
  const Type_handler *aggregate_for_result(const Type_handler *a,
                                           const Type_handler *b)
                                           const override
  {
    const Type_handler *h;
    if ((h= aggregate_common(a, b)) || (h= aggregate_if_string(a, b)))
      return h;
    return NULL;
  }

const Type_handler *aggregate_for_min_max(const Type_handler *a,
                                            const Type_handler *b)
                                            const override
  {
    return aggregate_for_result(a, b);
  }

const Type_handler *aggregate_for_comparison(const Type_handler *a,
                                               const Type_handler *b)
                                               const override
  {
    if (const Type_handler *h= aggregate_common(a, b))
      return h;
    static const Type_aggregator::Pair agg[]=
    {
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_null,      Type_handler_fbt<FbtImpl>::singleton()},
      {Type_handler_fbt<FbtImpl>::singleton(), &type_handler_long_blob, Type_handler_fbt<FbtImpl>::singleton()},
      {NULL,NULL,NULL}
    };
    return Type_aggregator::find_handler_in_array(agg, a, b, true);
  }

const Type_handler *aggregate_for_num_op(const Type_handler *a,
                                           const Type_handler *b)
                                           const override
  {
    return NULL;
  }

const Type_handler *type_handler_for_implicit_upgrade(
                                               const Type_handler *from) const
  {
    return from;
  }

static Type_collection_fbt *singleton()
  {
    static Type_collection_fbt tc;
    return &tc;
  }
};

#endif /* SQL_TYPE_FIXEDBIN_H */

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