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rpl_write_set_handler.cc
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/* Copyright (c) 2014, 2024, 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 designed to work 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 either included with
the program or referenced in the documentation.
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 */
#include "sql/rpl_write_set_handler.h"
#include <inttypes.h>
#include <stddef.h>
#include <sys/types.h>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "lex_string.h"
#include "my_base.h"
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_murmur3.h" // murmur3_32
#include "my_xxhash.h" // IWYU pragma: keep
#include "mysql/strings/m_ctype.h"
#include "mysql_com.h"
#include "sql-common/json_binary.h"
#include "sql-common/json_dom.h"
#include "sql/field.h" // Field
#include "sql/key.h"
#include "sql/query_options.h"
#include "sql/rpl_transaction_write_set_ctx.h"
#include "sql/sql_class.h" // THD
#include "sql/sql_const.h"
#include "sql/system_variables.h"
#include "sql/table.h" // TABLE
#include "sql/transaction_info.h"
#include "template_utils.h"
#define HASH_STRING_SEPARATOR "½"
#ifndef NDEBUG
static void debug_check_for_write_sets(
std::vector<std::string> &key_list_to_hash,
std::vector<uint64> &hash_list) {
DBUG_EXECUTE_IF(
"PKE_assert_single_primary_key_generated_insert",
assert(key_list_to_hash.size() == 1);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 1);
assert(hash_list[0] == 340395741608101502ULL););
DBUG_EXECUTE_IF(
"PKE_assert_single_primary_key_generated_update",
assert(key_list_to_hash.size() == 1);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR "1" ||
key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 1);
assert(hash_list[0] == 8563267070232261320ULL ||
hash_list[0] == 340395741608101502ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multi_primary_key_generated_insert",
assert(key_list_to_hash.size() == 1);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 1);
assert(hash_list[0] == 13655149628280894901ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multi_primary_key_generated_update",
assert(key_list_to_hash.size() == 1);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "1" ||
key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 1);
assert(hash_list[0] == 16833405476607614310ULL ||
hash_list[0] == 13655149628280894901ULL););
DBUG_EXECUTE_IF(
"PKE_assert_single_primary_unique_key_generated_insert",
assert(key_list_to_hash.size() == 3);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"c3" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 3);
assert(hash_list[0] == 340395741608101502ULL &&
hash_list[1] == 12796928550717161120ULL &&
hash_list[2] == 11199547876733116431ULL););
DBUG_EXECUTE_IF(
"PKE_assert_single_primary_unique_key_generated_update",
assert(key_list_to_hash.size() == 3);
assert((key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"c3" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR "1") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"c3" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR "1"));
assert(hash_list.size() == 3);
assert((hash_list[0] == 7803002059431370747ULL &&
hash_list[1] == 12796928550717161120ULL &&
hash_list[2] == 11199547876733116431ULL) ||
(hash_list[0] == 340395741608101502ULL &&
hash_list[1] == 12796928550717161120ULL &&
hash_list[2] == 11199547876733116431ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_multi_primary_unique_key_generated_insert",
assert(key_list_to_hash.size() == 3);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"b" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"c" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "24" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 3);
assert(hash_list[0] == 13655149628280894901ULL &&
hash_list[1] == 8954424140835647185ULL &&
hash_list[2] == 3520344117573337805ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multi_primary_unique_key_generated_update",
assert(key_list_to_hash.size() == 3);
assert((key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"b" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"c" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "24" HASH_STRING_SEPARATOR "1") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"b" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"c" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "24" HASH_STRING_SEPARATOR "1"));
assert(hash_list.size() == 3);
assert((hash_list[0] == 13655149628280894901ULL &&
hash_list[1] == 8954424140835647185ULL &&
hash_list[2] == 3520344117573337805ULL) ||
(hash_list[0] == 17122769277112661326ULL &&
hash_list[1] == 8954424140835647185ULL &&
hash_list[2] == 3520344117573337805ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_multi_foreign_key_generated_insert",
assert(key_list_to_hash.size() == 4);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t3" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"15" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t3" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[3] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 4);
assert(hash_list[0] == 3283233640848908273ULL &&
hash_list[1] == 17221725733811443497ULL &&
hash_list[2] == 340395741608101502ULL &&
hash_list[3] == 14682037479339770823ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multi_foreign_key_generated_update",
assert(key_list_to_hash.size() == 4);
assert((key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t3" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"15" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t3" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[3] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR "1") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t3" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR
"15" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t3" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "23" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[3] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR "1"));
assert(hash_list.size() == 4);
assert((hash_list[0] == 3283233640848908273ULL &&
hash_list[1] == 17221725733811443497ULL &&
hash_list[2] == 340395741608101502ULL &&
hash_list[3] == 14682037479339770823ULL) ||
(hash_list[0] == 12666755939597291234ULL &&
hash_list[1] == 17221725733811443497ULL &&
hash_list[2] == 8563267070232261320ULL &&
hash_list[3] == 14682037479339770823ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_foreign_key_on_referenced_unique_key_parent_generated_insert",
assert(key_list_to_hash.size() == 2);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 2);
assert(hash_list[0] == 16097759999475440183ULL &&
hash_list[1] == 12796928550717161120ULL););
DBUG_EXECUTE_IF(
"PKE_assert_foreign_key_on_referenced_unique_key_generated_insert",
assert(key_list_to_hash.size() == 2);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 2);
assert(hash_list[0] == 10002085147685770725ULL &&
hash_list[1] == 8692935619695688993ULL););
DBUG_EXECUTE_IF(
"PKE_assert_foreign_key_on_referenced_unique_key_generated_update",
assert(key_list_to_hash.size() == 2);
assert((key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"c2" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1"));
assert(hash_list.size() == 2);
assert((hash_list[0] == 10002085147685770725ULL &&
hash_list[1] == 12796928550717161120ULL) ||
(hash_list[0] == 10002085147685770725ULL &&
hash_list[1] == 8692935619695688993ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_foreign_key_on_referenced_non_unique_key_parent_generated_"
"insert",
assert(key_list_to_hash.size() == 1);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 1);
assert(hash_list[0] == 16097759999475440183ULL););
DBUG_EXECUTE_IF(
"PKE_assert_foreign_key_on_referenced_non_unique_key_generated_insert",
assert(key_list_to_hash.size() == 1);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 1);
assert(hash_list[0] == 10002085147685770725ULL););
DBUG_EXECUTE_IF(
"PKE_assert_foreign_key_on_referenced_non_unique_key_generated_update",
assert(key_list_to_hash.size() == 1);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 1);
assert(hash_list[0] == 10002085147685770725ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multi_column_foreign_key_on_multiple_column_primary_key_"
"insert",
assert(key_list_to_hash.size() == 2);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "13" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "13" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 2);
assert(hash_list[0] == 15066957522449671266ULL &&
hash_list[1] == 9647156720027801592ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multi_column_foreign_key_on_multiple_column_primary_key_"
"update",
assert(key_list_to_hash.size() == 2);
assert((key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "24" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "13" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "24" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "13" HASH_STRING_SEPARATOR "1") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "13" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR
"12" HASH_STRING_SEPARATOR "13" HASH_STRING_SEPARATOR "1"));
assert(hash_list.size() == 2);
assert((hash_list[0] == 12726729333133305663ULL &&
hash_list[1] == 17273381564889724595ULL) ||
(hash_list[0] == 15066957522449671266ULL &&
hash_list[1] == 9647156720027801592ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_multiple_column_unique_key_insert",
assert(key_list_to_hash.size() == 2);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"key_b_c" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR
"13" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 2);
assert(hash_list[0] == 340395741608101502ULL &&
hash_list[1] == 14341778092818779177ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multi_column_foreign_key_on_multiple_column_unique_key_"
"insert",
assert(key_list_to_hash.size() == 3);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"key_e_f" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR
"13" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"key_b_c" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR
"13" HASH_STRING_SEPARATOR "1");
assert(hash_list.size() == 3);
assert(hash_list[0] == 10002085147685770725ULL &&
hash_list[1] == 7781576503154198764ULL &&
hash_list[2] == 14341778092818779177ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multi_column_foreign_key_on_multiple_column_unique_key_"
"update",
assert(key_list_to_hash.size() == 3);
assert((key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "24" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"key_e_f" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR
"16" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"key_b_c" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "25" HASH_STRING_SEPARATOR
"16" HASH_STRING_SEPARATOR "1") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "21" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"key_e_f" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t2" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR
"13" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[2] ==
"key_b_c" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR
"13" HASH_STRING_SEPARATOR "1"));
assert(hash_list.size() == 3);
assert((hash_list[0] == 7572125940027161025ULL &&
hash_list[1] == 12139583969308846244ULL &&
hash_list[2] == 3682008013696622692ULL) ||
(hash_list[0] == 10002085147685770725ULL &&
hash_list[1] == 7781576503154198764ULL &&
hash_list[2] == 14341778092818779177ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_single_primary_key_part_insert",
assert(key_list_to_hash.size() == 2);
assert(hash_list.size() == 2); assert(
key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034\217\034\217\034\217\034\217" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[1] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034\217\034\217\034\217\034\217\036\377\036\377\036\377\036"
"\377" HASH_STRING_SEPARATOR "16");
assert(hash_list[0] == 16317411346116498013ULL &&
hash_list[1] == 18003062610192037758ULL););
DBUG_EXECUTE_IF(
"PKE_assert_single_primary_key_part_update",
assert(key_list_to_hash.size() == 2);
assert(hash_list.size() == 2); assert(
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034`\034`\034`\034`" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[1] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "2\034`\034`\034`\034`"
"\036\377\036\377\036\377\036\377" HASH_STRING_SEPARATOR "16") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034\217\034\217\034\217\034\217" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[1] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034\217\034\217\034\217\034\217\036\377\036\377\036\377\036"
"\377" HASH_STRING_SEPARATOR "16"));
assert((hash_list[0] == 12854286396201953359ULL &&
hash_list[1] == 7801970996840350074ULL) ||
(hash_list[0] == 16317411346116498013ULL &&
hash_list[1] == 18003062610192037758ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_multiple_primary_key_part_insert",
assert(key_list_to_hash.size() == 2);
assert(hash_list.size() == 2);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G" HASH_STRING_SEPARATOR
"8\034z\034z\034z\034z" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[1] == "PRIMARY" HASH_STRING_SEPARATOR
"test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G\036\377\036\377\036"
"\377\036\377" HASH_STRING_SEPARATOR
"16\034z\034z\034z\034z\036\377\036\377\036"
"\377\036\377" HASH_STRING_SEPARATOR "16");
assert(hash_list[0] == 11952739978637581076ULL &&
hash_list[1] == 5625842696515157153ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multiple_primary_key_part_update",
assert(key_list_to_hash.size() == 2);
assert(hash_list.size() == 2); assert(
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G" HASH_STRING_SEPARATOR
"8\034\217\034\217\034\217\034\217" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[1] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G\036\377\036\377\036\377\036"
"\377" HASH_STRING_SEPARATOR
"16\034\217\034\217\034\217\034\217\036\377\036\377\036\377\036"
"\377" HASH_STRING_SEPARATOR "16") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G" HASH_STRING_SEPARATOR
"8\034z\034z\034z\034z" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[1] == "PRIMARY" HASH_STRING_SEPARATOR
"test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G\036\377\036\377\036"
"\377\036\377" HASH_STRING_SEPARATOR
"16\034z\034z\034z\034z\036\377\036\377\036"
"\377\036\377" HASH_STRING_SEPARATOR "16"));
assert((hash_list[0] == 321901661932738829ULL &&
hash_list[1] == 13548511452318291546ULL) ||
(hash_list[0] == 11952739978637581076ULL &&
hash_list[1] == 5625842696515157153ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_single_unique_key_part_insert",
assert(key_list_to_hash.size() == 3);
assert(hash_list.size() == 3);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034`\034`\034`\034`" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[2] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "2\034`\034`\034`\034`"
"\036\377\036\377\036\377\036\377" HASH_STRING_SEPARATOR "16");
assert(hash_list[0] == 16097759999475440183ULL &&
hash_list[1] == 7725531530140183570ULL &&
hash_list[2] == 14701666498086136515ULL););
DBUG_EXECUTE_IF(
"PKE_assert_single_unique_key_part_update",
assert(key_list_to_hash.size() == 3);
assert(hash_list.size() == 3); assert(
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034\217\034\217\034\217\034\217" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[2] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034\217\034\217\034\217\034\217\036\377\036\377\036\377\036"
"\377" HASH_STRING_SEPARATOR "16") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034`\034`\034`\034`" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[2] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "2\034`\034`\034`\034`"
"\036\377\036\377\036\377\036\377" HASH_STRING_SEPARATOR "16"));
assert((hash_list[0] == 16097759999475440183ULL &&
hash_list[1] == 5363251102313010695ULL &&
hash_list[2] == 14835022138864790192ULL) ||
(hash_list[0] == 16097759999475440183ULL &&
hash_list[1] == 7725531530140183570ULL &&
hash_list[2] == 14701666498086136515ULL)););
DBUG_EXECUTE_IF(
"PKE_assert_multiple_unique_key_part_insert",
assert(key_list_to_hash.size() == 3);
assert(hash_list.size() == 3);
assert(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G" HASH_STRING_SEPARATOR
"8\034z\034z\034z\034z" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[2] == "a" HASH_STRING_SEPARATOR
"test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G\036\377\036\377\036"
"\377\036\377" HASH_STRING_SEPARATOR
"16\034z\034z\034z\034z\036\377\036\377\036"
"\377\036\377" HASH_STRING_SEPARATOR "16");
assert(hash_list[0] == 16097759999475440183ULL &&
hash_list[1] == 1438169577983365775ULL &&
hash_list[2] == 312264863968578629ULL););
DBUG_EXECUTE_IF(
"PKE_assert_multiple_unique_key_part_update",
assert(key_list_to_hash.size() == 3);
assert(hash_list.size() == 3); assert(
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G" HASH_STRING_SEPARATOR
"8\034\217\034\217\034\217\034\217" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[2] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G\036\377\036\377\036\377\036"
"\377" HASH_STRING_SEPARATOR
"16\034\217\034\217\034\217\034\217\036\377\036\377\036\377"
"\036\377" HASH_STRING_SEPARATOR "16") ||
(key_list_to_hash[0] ==
"PRIMARY" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR "22" HASH_STRING_SEPARATOR "1" &&
key_list_to_hash[1] ==
"a" HASH_STRING_SEPARATOR "test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G" HASH_STRING_SEPARATOR
"8\034z\034z\034z\034z" HASH_STRING_SEPARATOR "8" &&
key_list_to_hash[2] == "a" HASH_STRING_SEPARATOR
"test" HASH_STRING_SEPARATOR
"4t1" HASH_STRING_SEPARATOR
"2\034G\034G\034G\034G\036\377\036\377\036"
"\377\036\377" HASH_STRING_SEPARATOR
"16\034z\034z\034z\034z\036\377\036\377\036"
"\377\036\377" HASH_STRING_SEPARATOR "16"));
assert((hash_list[0] == 16097759999475440183ULL &&
hash_list[1] == 7001586410307804499ULL &&
hash_list[2] == 888558645316043973ULL) ||
(hash_list[0] == 16097759999475440183ULL &&
hash_list[1] == 1438169577983365775ULL &&
hash_list[2] == 312264863968578629ULL)););
}
#endif
/**
Function to generate the hash of the string passed to this function.
@param[in] pke - the string to be hashed.
@param[in] thd - THD object pointing to current thread.
@return true if a problem occurred on generation or write set tracking.
*/
#ifndef NDEBUG
/**
@param[in] write_sets - list of all write sets
@param[in] hash_list - list of all hashes
*/
#endif
static bool generate_hash_pke(const std::string &pke, THD *thd
#ifndef NDEBUG
,
std::vector<std::string> &write_sets,
std::vector<uint64> &hash_list
#endif
) {
DBUG_TRACE;
uint64 hash = MY_XXH64(pke.c_str(), pke.size(), 0);
if (thd->get_transaction()->get_transaction_write_set_ctx()->add_write_set(
hash))
return true;
#ifndef NDEBUG
write_sets.push_back(pke);
hash_list.push_back(hash);
#endif
DBUG_PRINT("info", ("pke: %s; hash: %" PRIu64, pke.c_str(), hash));
return false;
}
/**
Function to generate set of hashes for a multi-valued key
@param[in] prefix_pke - stringified non-multi-valued prefix of key
@param[in] thd - THD object pointing to current thread.
@param[in] fld - multi-valued keypart's field
@return true if a problem occurred on generation or write set tracking.
*/
#ifndef NDEBUG
/**
@param[in] write_sets - DEBUG ONLY, vector of added PKEs
@param[in] hash_list - DEBUG ONLY, list of all hashes
*/
#endif
static bool generate_mv_hash_pke(const std::string &prefix_pke, THD *thd,
Field *fld
#ifndef NDEBUG
,
std::vector<std::string> &write_sets,
std::vector<uint64> &hash_list
#endif
) {
Field_typed_array *field = down_cast<Field_typed_array *>(fld);
json_binary::Value v(
json_binary::parse_binary(field->get_binary(), field->data_length()));
uint elems = v.element_count();
if (!elems || field->is_null()) {
// Multi-valued key part doesn't contain actual values.
// No need to hash prefix pke as it won't cause conflicts.
} else {
const CHARSET_INFO *cs = field->charset();
size_t max_length = cs->coll->strnxfrmlen(cs, field->key_length());
std::unique_ptr<uchar[]> pk_value(new uchar[max_length + 1]());
assert(v.type() == json_binary::Value::ARRAY);
for (uint i = 0; i < elems; i++) {
std::string pke = prefix_pke;
json_binary::Value elt = v.element(i);
Json_wrapper wr(elt);
/*
convert to normalized string and store so that it can be
sorted using binary comparison functions like memcmp.
*/
size_t length = field->make_sort_key(&wr, pk_value.get(), max_length);
pk_value[length] = 0;
pke.append(pointer_cast<char *>(pk_value.get()), length);
pke.append(HASH_STRING_SEPARATOR);
pke.append(std::to_string(length));
if (generate_hash_pke(pke, thd
#ifndef NDEBUG
,
write_sets, hash_list
#endif
))
return true;
}
}
return false;
}
bool add_pke(TABLE *table, THD *thd, const uchar *record) {
DBUG_TRACE;
assert(record == table->record[0] || record == table->record[1]);
/*
The next section extracts the primary key equivalent of the rows that are
changing during the current transaction.
1. The primary key field is always stored in the key_part[0] so we can
simply read the value from the table->s->keys.
2. Along with primary key we also need to extract the unique key values to
look for the places where we are breaking the unique key constraints.
These keys (primary/unique) are prefixed with their index names.
In MySQL, the name of a PRIMARY KEY is PRIMARY. For other indexes, if
you do not assign a name, the index is assigned the same name as the
first indexed column, with an optional suffix (_2, _3, ...) to make it
unique.
example :
CREATE TABLE db1.t1 (i INT NOT NULL PRIMARY KEY, j INT UNIQUE KEY, k INT
UNIQUE KEY);
INSERT INTO db1.t1 VALUES(1, 2, 3);
Here the write set string will have three values and the prepared value
before hash function is used will be :
i -> PRIMARYdb13t1211 => PRIMARY is the index name (for primary key)
j -> jdb13t1221 => 'j' is the index name (for first unique key)
k -> kdb13t1231 => 'k' is the index name (for second unique key)
Finally these value are hashed using the murmur hash function to prevent
sending more for certification algorithm.
*/
Rpl_transaction_write_set_ctx *ws_ctx =
thd->get_transaction()->get_transaction_write_set_ctx();
bool writeset_hashes_added = false;
if (table->key_info && (table->s->primary_key < MAX_KEY)) {
const ptrdiff_t ptrdiff = record - table->record[0];
std::string pke_schema_table;
pke_schema_table.reserve(NAME_LEN * 3);
pke_schema_table.append(HASH_STRING_SEPARATOR);
pke_schema_table.append(table->s->db.str, table->s->db.length);
pke_schema_table.append(HASH_STRING_SEPARATOR);
pke_schema_table.append(std::to_string(table->s->db.length));
pke_schema_table.append(table->s->table_name.str,
table->s->table_name.length);
pke_schema_table.append(HASH_STRING_SEPARATOR);
pke_schema_table.append(std::to_string(table->s->table_name.length));
std::string pke;
pke.reserve(NAME_LEN * 5);
#ifndef NDEBUG
std::vector<std::string> write_sets;
std::vector<uint64> hash_list;
#endif
for (uint key_number = 0; key_number < table->s->keys; key_number++) {
// Skip non unique.
if (!((table->key_info[key_number].flags & (HA_NOSAME)) == HA_NOSAME))
continue;
enum pke_mode_e { STANDARD_PKE = 1, NO_PARTIAL_KEYS_PKE = 2, END = 3 };
bool old_pke_needed = false;
uint pke_mode = pke_mode_e::STANDARD_PKE;
DBUG_EXECUTE_IF("do_not_add_pke_key_part",
{ pke_mode = pke_mode_e::NO_PARTIAL_KEYS_PKE; });
while (pke_mode != pke_mode_e::END) {
pke.clear();
pke.append(table->key_info[key_number].name);
pke.append(pke_schema_table);
uint i = 0;
// Whether the key has mv keypart which have to be handled separately
Field *mv_field = nullptr;
for (/*empty*/; i < table->key_info[key_number].user_defined_key_parts;
i++) {
/* Get the primary key field index. */
int index = table->key_info[key_number].key_part[i].fieldnr;
Field *field = table->field[index - 1];
/* Ignore if the value is NULL. */
if (field->is_null(ptrdiff)) break;
if (field->is_array()) {
// There can be only one multi-valued key part per key
assert(!mv_field);
mv_field = field;
// Skip it for now
continue;
}
/*
Update the field offset as we may be working on table->record[0]
or table->record[1], depending on the "record" parameter.
*/
field->move_field_offset(ptrdiff);
const CHARSET_INFO *cs = field->charset();
size_t key_length = table->key_info[key_number].key_part[i].length;
size_t max_length = cs->coll->strnxfrmlen(cs, key_length);
if (pke_mode == pke_mode_e::STANDARD_PKE) {
std::unique_ptr<uchar[]> pk_value(new uchar[max_length + 1]());
/*
convert to normalized string and store so that it can be
sorted using binary comparison functions like memcmp.
*/
size_t length = field->make_sort_key(pk_value.get(), max_length,
key_length / cs->mbmaxlen);
pk_value[length] = 0;
pke.append(pointer_cast<char *>(pk_value.get()), length);
pke.append(HASH_STRING_SEPARATOR);
pke.append(std::to_string(length));
}
/*
When we upgrade a group, old members might be using the old PKEs and
so they identify a row A with key OLD_PKE. This is the value that is
in the certification table. When all members are upgrade and are now
in the latest version, all members now identify row A with key
NEW_PKE. How do you detect conflicts in row A if the transactions in
the certification database have the old PKE?
So the decision taken was to always send the old PKE and the new PKE
when keys have only a partial value of a column. In 9.0 we remove
this code for the old PKE.
*/
size_t pack_length = cs->coll->strnxfrmlen(cs, field->pack_length());
if (pke_mode == pke_mode_e::NO_PARTIAL_KEYS_PKE) {
std::unique_ptr<uchar[]> pk_value(new uchar[pack_length + 1]());
/*
convert to normalized string and store so that it can be
sorted using binary comparison functions like memcmp.
*/
size_t length = field->make_sort_key(pk_value.get(), pack_length);
pk_value[length] = 0;
pke.append(pointer_cast<char *>(pk_value.get()), length);
pke.append(HASH_STRING_SEPARATOR);
pke.append(std::to_string(length));
}
if (pke_mode == pke_mode_e::STANDARD_PKE &&
max_length != pack_length) {
old_pke_needed = true;
}
field->move_field_offset(-ptrdiff);
}
/*
If any part of the key is NULL, ignore adding it to hash keys.
NULL cannot conflict with any value.
Eg: create table t1(i int primary key not null, j int, k int,
unique key (j, k));
insert into t1 values (1, 2, NULL);
insert into t1 values (2, 2, NULL); => this is allowed.
*/
if (i == table->key_info[key_number].user_defined_key_parts) {
if (mv_field) {
mv_field->move_field_offset(ptrdiff);
if (generate_mv_hash_pke(pke, thd, mv_field
#ifndef NDEBUG
,
write_sets, hash_list
#endif
))
return true;
mv_field->move_field_offset(-ptrdiff);
} else {
if (generate_hash_pke(pke, thd
#ifndef NDEBUG
,
write_sets, hash_list
#endif
))
return true;
}
writeset_hashes_added = true;
} else {
/* This is impossible to happen in case of primary keys */
assert(key_number != 0);
}
if (pke_mode == pke_mode_e::STANDARD_PKE && old_pke_needed == true) {
pke_mode = pke_mode_e::NO_PARTIAL_KEYS_PKE;
} else {
pke_mode = pke_mode_e::END;
}
}
}
/*
Foreign keys handling.
OPTION_NO_FOREIGN_KEY_CHECKS bit in options_bits is set at two places
1) If the user executed 'SET foreign_key_checks= 0' on the local session
before executing the query.
or
2) We are applying a RBR event (i.e., the event is from a remote server)
and logic in Rows_log_event::do_apply_event found out that the event is
generated from a remote server session that disabled foreign_key_checks
(using 'SET foreign_key_checks=0').
In either of the above cases (i.e., the foreign key check is disabled for
the current query/current event), we should ignore generating
the foreign key information as they should not participate
in the conflicts detecting algorithm.
*/
if (!(thd->variables.option_bits & OPTION_NO_FOREIGN_KEY_CHECKS) &&
table->s->foreign_keys > 0) {
TABLE_SHARE_FOREIGN_KEY_INFO *fk = table->s->foreign_key;
for (uint fk_number = 0; fk_number < table->s->foreign_keys;
fk_number++) {
/*
There are two situations on which there is no
unique_constraint_name, which means that the foreign key
must be skipped.
1) The referenced table was dropped using
foreign_key_checks= 0, on that case we cannot check
foreign key and need to skip it.
2) The foreign key does reference a non unique key, thence
it must be skipped since it cannot be used to check
conflicts/dependencies.
Example:
CREATE TABLE t1 (c1 INT PRIMARY KEY, c2 INT, KEY(c2));
CREATE TABLE t2 (x1 INT PRIMARY KEY, x2 INT,
FOREIGN KEY (x2) REFERENCES t1(c2));
DELETE FROM t1 WHERE c1=1;
does generate the PKEs:
PRIMARY½test½4t1½21½1
INSERT INTO t2 VALUES (1,1);