MySQL  8.0.18
Source Code Documentation
sql_tmp_table.h
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1 #ifndef SQL_TMP_TABLE_INCLUDED
2 #define SQL_TMP_TABLE_INCLUDED
3 
4 /* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
5 
6  This program is free software; you can redistribute it and/or modify
7  it under the terms of the GNU General Public License, version 2.0,
8  as published by the Free Software Foundation.
9 
10  This program is also distributed with certain software (including
11  but not limited to OpenSSL) that is licensed under separate terms,
12  as designated in a particular file or component or in included license
13  documentation. The authors of MySQL hereby grant you an additional
14  permission to link the program and your derivative works with the
15  separately licensed software that they have included with MySQL.
16 
17  This program is distributed in the hope that it will be useful,
18  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20  GNU General Public License, version 2.0, for more details.
21 
22  You should have received a copy of the GNU General Public License
23  along with this program; if not, write to the Free Software
24  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
25 
26 /**
27  @file
28 
29  @brief
30  Temporary table handling functions.
31 */
32 
33 #include <stddef.h>
34 #include <sys/types.h>
35 
36 #include "my_base.h" // ha_rows
37 #include "my_inttypes.h"
38 #include "sql/item.h" // Item
39 #include "sql/mem_root_array.h"
40 #include "sql/temp_table_param.h"
41 
42 class Create_field;
43 class Field;
44 class KEY;
45 class SJ_TMP_TABLE;
46 class THD;
47 struct ORDER;
48 struct TABLE;
49 template <class T>
50 class List;
51 
55 };
56 
58  ORDER *group, bool distinct, bool save_sum_fields,
59  ulonglong select_options, ha_rows rows_limit,
60  const char *table_alias);
61 bool open_tmp_table(TABLE *table);
63  bool is_virtual = true,
64  ulonglong select_options = 0,
65  const char *alias = NULL);
66 bool create_ondisk_from_heap(THD *thd, TABLE *table, int error,
67  bool ignore_last_dup, bool *is_duplicate);
68 void free_tmp_table(THD *thd, TABLE *entry);
69 TABLE *create_duplicate_weedout_tmp_table(THD *thd, uint uniq_tuple_length_arg,
70  SJ_TMP_TABLE *sjtbl);
71 bool instantiate_tmp_table(THD *thd, TABLE *table);
72 Field *create_tmp_field(THD *thd, TABLE *table, Item *item, Item::Type type,
73  Func_ptr_array *copy_func, Field **from_field,
74  Field **default_field, bool group, bool modify_item,
75  bool table_cant_handle_bit_fields, bool make_copy_field,
76  bool copy_result_field = false);
77 Field *create_tmp_field_from_field(THD *thd, Field *org_field, const char *name,
78  TABLE *table, Item_field *item);
79 
80 /**
81  Get the minimum of max_key_length and max_key_part_length between
82  HEAP engine and internal_tmp_disk_storage_engine.
83 */
84 void get_max_key_and_part_length(uint *max_key_length,
85  uint *max_key_part_length,
86  uint *max_key_parts);
88 void encode_innodb_position(uchar *rowid_bytes, uint length, ha_rows row_num);
89 bool reposition_innodb_cursor(TABLE *table, ha_rows row_num);
90 #endif /* SQL_TMP_TABLE_INCLUDED */
Definition: item.h:3341
unsigned long long int ulonglong
Definition: my_inttypes.h:55
unsigned char uchar
Definition: my_inttypes.h:51
Definition: sql_tmp_table.h:54
const string name("\ame\)
Order clause list element.
Definition: table.h:276
TABLE * create_tmp_table_from_fields(THD *thd, List< Create_field > &field_list, bool is_virtual=true, ulonglong select_options=0, const char *alias=NULL)
Create an, optionally reduced, TABLE object with properly set up Field list from a list of field defi...
Definition: sql_tmp_table.cc:1829
Some integer typedefs for easier portability.
void init_cache_tmp_engine_properties()
Initialize the storage engine properties for the alternative temporary table storage engines...
Definition: sql_tmp_table.cc:549
Definition: field.h:700
void free_tmp_table(THD *thd, TABLE *entry)
Free TABLE object and release associated resources for internal temporary table.
Definition: sql_tmp_table.cc:2299
Definition: table.h:1301
bool is_duplicate(Country_record *record, int skip_index)
Check for duplicate value of Primary/Unique Key column(s).
Definition: pfs_example_country.cc:50
This file includes constants used by all storage engines.
void encode_innodb_position(uchar *rowid_bytes, uint length, ha_rows row_num)
Encode an InnoDB PK in 6 bytes, high-byte first; like InnoDB&#39;s dict_sys_write_row_id() does...
Definition: sql_tmp_table.cc:2738
bool instantiate_tmp_table(THD *thd, TABLE *table)
Instantiates temporary table.
Definition: sql_tmp_table.cc:2247
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)
Definition: sql_tmp_table.cc:824
Definition: aggregate_check.h:523
bool reposition_innodb_cursor(TABLE *table, ha_rows row_num)
Helper function for create_ondisk_from_heap().
Definition: sql_tmp_table.cc:2761
Definition: item.h:668
unsigned int uint
Definition: uca-dump.cc:29
Type
Definition: item.h:704
void get_max_key_and_part_length(uint *max_key_length, uint *max_key_part_length, uint *max_key_parts)
Get the minimum of max_key_length and max_key_part_length between HEAP engine and internal_tmp_disk_s...
Definition: sql_tmp_table.cc:567
A typesafe replacement for DYNAMIC_ARRAY.
Definition: mem_root_array.h:398
Field * create_tmp_field_from_field(THD *thd, Field *org_field, const char *name, TABLE *table, Item_field *item)
Create field for temporary table from given field.
Definition: sql_tmp_table.cc:114
int type
Definition: http_common.h:411
Create_field is a description a field/column that may or may not exists in a table.
Definition: create_field.h:50
Definition: sql_executor.h:108
TABLE * create_duplicate_weedout_tmp_table(THD *thd, uint uniq_tuple_length_arg, SJ_TMP_TABLE *sjtbl)
Create a temporary table to weed out duplicate rowid combinations.
Definition: sql_tmp_table.cc:1606
Definition: key.h:111
enum_internal_tmp_mem_storage_engine
Definition: sql_tmp_table.h:52
#define NULL
Definition: types.h:55
bool create_ondisk_from_heap(THD *thd, TABLE *table, int error, bool ignore_last_dup, bool *is_duplicate)
If a MEMORY table gets full, create a disk-based table and copy all rows to this. ...
Definition: sql_tmp_table.cc:2405
bool open_tmp_table(TABLE *table)
Definition: sql_tmp_table.cc:2110
Definition: completion_hash.h:34
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, bool copy_result_field=false)
Create field for temporary table.
Definition: sql_tmp_table.cc:301
bool length(const dd::Spatial_reference_system *srs, const Geometry *g1, double *length, bool *null) noexcept
Computes the length of linestrings and multilinestrings.
Definition: length.cc:75
Definition: sql_tmp_table.h:53
my_off_t ha_rows
Definition: my_base.h:1130
Object containing parameters used when creating and using temporary tables.
Definition: temp_table_param.h:70
For each client connection we create a separate thread with THD serving as a thread/connection descri...
Definition: sql_class.h:778
Log error(cerr, "ERROR")