#ifndef SQL_TMP_TABLE_INCLUDED
#define SQL_TMP_TABLE_INCLUDED

/* Copyright (c) 2000, 2021, Oracle and/or its affiliates.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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 02110-1301  USA */


/**
  @file

  @brief
  Temporary table handling functions.
*/

#include "my_global.h"
#include "my_base.h"        // ha_rows
#include "item.h"           // Item

class Create_field;
class Field;
class Opt_trace_context;
class SJ_TMP_TABLE;
class Temp_table_param;
class THD;
struct TABLE;
template<typename Element_type, bool has_trivial_destructor>
  class Mem_root_array;
template <class T> class List;
typedef struct st_columndef MI_COLUMNDEF;
typedef struct st_key KEY;
typedef struct st_order ORDER;
typedef Mem_root_array<Item*, true> Func_ptr_array;


/*
   For global system variable internal_tmp_disk_storage_engine
 */
enum enum_internal_tmp_disk_storage_engine { TMP_TABLE_MYISAM, TMP_TABLE_INNODB };

TABLE *
create_tmp_table(THD *thd, Temp_table_param *param, List<Item> &fields,
		 ORDER *group, bool distinct, bool save_sum_fields,
		 ulonglong select_options, ha_rows rows_limit,
		 const char *table_alias);
/**
  General routine to change field->ptr of a NULL-terminated array of Field
  objects. Useful when needed to call val_int, val_str or similar and the
  field data is not in table->record[0] but in some other structure.
  set_key_field_ptr changes all fields of an index using a key_info object.
  All methods presume that there is at least one field to change.
*/

TABLE *create_virtual_tmp_table(THD *thd, List<Create_field> &field_list);
bool create_ondisk_from_heap(THD *thd, TABLE *table,
                             MI_COLUMNDEF *start_recinfo,
                             MI_COLUMNDEF **recinfo, 
			     int error, bool ignore_last_dup,
                             bool *is_duplicate);
void free_tmp_table(THD *thd, TABLE *entry);
TABLE *create_duplicate_weedout_tmp_table(THD *thd, 
                                          uint uniq_tuple_length_arg,
                                          SJ_TMP_TABLE *sjtbl);
bool instantiate_tmp_table(TABLE *table, KEY *keyinfo,
                           MI_COLUMNDEF *start_recinfo,
                           MI_COLUMNDEF **recinfo,
                           ulonglong options, my_bool big_tables,
                           Opt_trace_context *trace);
Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
                        Func_ptr_array *copy_func, Field **from_field,
                        Field **default_field,
                        bool group, bool modify_item,
                        bool table_cant_handle_bit_fields,
                        bool make_copy_field);
Field* create_tmp_field_from_field(THD *thd, Field* org_field,
                                   const char *name, TABLE *table,
                                   Item_field *item);

/**
  Get the minimum of max_key_length and max_key_part_length between
  HEAP engine and internal_tmp_disk_storage_engine.
*/
void get_max_key_and_part_length(uint *max_key_length,
                                 uint *max_key_part_length);
/**
  Initilize the storage engine properties for the alternative temporary table
  storage engines.
*/
void init_cache_tmp_engine_properties();
#endif /* SQL_TMP_TABLE_INCLUDED */

