sql_user_table.cc File Reference

#include "sql/auth/sql_user_table.h"
#include "my_config.h"
#include <stddef.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <memory>
#include <set>
#include <unordered_map>
#include <utility>
#include "lex_string.h"
#include "m_ctype.h"
#include "m_string.h"
#include "map_helpers.h"
#include "my_alloc.h"
#include "my_base.h"
#include "my_dbug.h"
#include "my_sqlcommand.h"
#include "my_sys.h"
#include "mysql/components/services/log_builtins.h"
#include "mysql/components/services/log_shared.h"
#include "mysql/psi/mysql_statement.h"
#include "mysql_com.h"
#include "mysql_time.h"
#include "mysqld_error.h"
#include "sql/auth/acl_change_notification.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/auth_common.h"
#include "sql/auth/auth_internal.h"
#include "sql/auth/sql_auth_cache.h"
#include "sql/auth/sql_authentication.h"
#include "sql/auth/sql_security_ctx.h"
#include "sql/binlog.h"
#include "sql/debug_sync.h"
#include "sql/error_handler.h"
#include "sql/field.h"
#include "sql/handler.h"
#include "sql/item_func.h"
#include "sql/key.h"
#include "sql/log.h"
#include "sql/mdl.h"
#include "sql/mysqld.h"
#include "sql/rpl_filter.h"
#include "sql/rpl_rli.h"
#include "sql/sql_base.h"
#include "sql/sql_class.h"
#include "sql/sql_connect.h"
#include "sql/sql_const.h"
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_list.h"
#include "sql/sql_parse.h"
#include "sql/sql_rewrite.h"
#include "sql/sql_table.h"
#include "sql/sql_update.h"
#include "sql/system_variables.h"
#include "sql/table.h"
#include "sql/transaction.h"
#include "sql/tztime.h"
#include "sql_string.h"
#include "thr_lock.h"
#include "typelib.h"
#include "violite.h"

Classes
class	acl_tables_setup_for_write_and_acquire_mdl_error_handler
	Internal_error_handler subclass to suppress ER_LOCK_DEADLOCK error. More...

Functions
static bool	acl_tables_setup_for_write_and_acquire_mdl (THD *thd, Table_ref *tables)
	Setup ACL tables to be opened in write mode. More...
void	commit_and_close_mysql_tables (THD *thd)
	A helper function to commit statement transaction and close ACL tables after reading some data from them as part of FLUSH PRIVILEGES statement or during server initialization. More...
Access_bitmask	get_access (TABLE *form, uint fieldnr, uint *next_field)
void	acl_notify_htons (THD *thd, enum_sql_command operation, const List< LEX_USER > *users, std::set< LEX_USER * > *rewrite_users, const List< LEX_CSTRING > *dynamic_privs)
static bool	acl_end_trans_and_close_tables (THD *thd, bool rollback_transaction, Lock_state_list *modified_user_lock_state_list)
	Commit or rollback ACL statement (and transaction), close tables which it has opened and release metadata locks. More...
bool	log_and_commit_acl_ddl (THD *thd, bool transactional_tables, std::set< LEX_USER * > *extra_users, Rewrite_params *rewrite_params, bool extra_error, bool write_to_binlog, Lock_state_list *modified_user_lock_state_list)
static void	get_grantor (THD *thd, char *grantor)
void	acl_print_ha_error (int handler_error)
	Take a handler error and generate the mysql error ER_ACL_OPERATION_FAILED containing original text of HA error. More...
int	replace_db_table (THD *thd, TABLE *table, const char *db, const LEX_USER &combo, Access_bitmask rights, bool revoke_grant)
	change grants in the mysql.db table. More...
int	replace_proxies_priv_table (THD *thd, TABLE *table, const LEX_USER *user, const LEX_USER *proxied_user, bool with_grant_arg, bool revoke_grant)
	Insert, update or remove a record in the mysql.proxies_priv table. More...
int	replace_column_table (THD *thd, GRANT_TABLE *g_t, TABLE *table, const LEX_USER &combo, List< LEX_COLUMN > &columns, const char *db, const char *table_name, Access_bitmask rights, bool revoke_grant)
	Update record in the table mysql.columns_priv. More...
int	replace_table_table (THD *thd, GRANT_TABLE *grant_table, std::unique_ptr< GRANT_TABLE, Destroy_only< GRANT_TABLE > > *deleted_grant_table, TABLE *table, const LEX_USER &combo, const char *db, const char *table_name, Access_bitmask rights, Access_bitmask col_rights, bool revoke_grant)
	Search and create/update a record for requested table privileges. More...
int	replace_routine_table (THD *thd, GRANT_NAME *grant_name, TABLE *table, const LEX_USER &combo, const char *db, const char *routine_name, bool is_proc, Access_bitmask rights, bool revoke_grant)
	Search and create/update a record for the routine requested. More...
static void	acl_tables_setup (Table_ref *tables, thr_lock_type lock_type, enum_mdl_type mdl_type)
	Construct Table_ref array for ACL tables. More...
void	acl_tables_setup_for_read (Table_ref *tables)
	Setup ACL tables to be opened in read mode. More...
int	open_grant_tables (THD *thd, Table_ref *tables, bool *transactional_tables)
	Open the grant tables. More...
static int	modify_grant_table (TABLE *table, Field *host_field, Field *user_field, LEX_USER *user_to)
	Modify a privilege table. More...
int	handle_grant_table (THD *, Table_ref *tables, ACL_TABLES table_no, bool drop, LEX_USER *user_from, LEX_USER *user_to)
	Handle a privilege table. More...
bool	check_engine_type_for_acl_table (Table_ref *tables, bool report_error)
	Check that every ACL table has a supported storage engine (InnoDB). More...
bool	is_acl_table_name (const char *name)
	Check if given table name is a ACL table name. More...
bool	is_acl_table (const TABLE *table)
	Check if given TABLE* is a ACL table name. More...

Variables
static const int	MAX_ACL_TABLE_NAMES = 10
static const char *	ACL_TABLE_NAMES [MAX_ACL_TABLE_NAMES]
static const TABLE_FIELD_TYPE	mysql_db_table_fields [MYSQL_DB_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_user_table_fields [MYSQL_USER_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_proxies_priv_table_fields [MYSQL_PROXIES_PRIV_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_procs_priv_table_fields [MYSQL_PROCS_PRIV_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_columns_priv_table_fields [MYSQL_COLUMNS_PRIV_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_tables_priv_table_fields [MYSQL_TABLES_PRIV_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_role_edges_table_fields [MYSQL_ROLE_EDGES_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_default_roles_table_fields [MYSQL_DEFAULT_ROLES_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_password_history_table_fields [MYSQL_PASSWORD_HISTORY_FIELD_COUNT]
static const TABLE_FIELD_TYPE	mysql_dynamic_priv_table_fields [MYSQL_DYNAMIC_PRIV_FIELD_COUNT]
bool	initialized

Function Documentation

acl_end_trans_and_close_tables()

static bool acl_end_trans_and_close_tables ( THD *  thd, bool  rollback_transaction, Lock_state_list *  modified_user_lock_state_list  )

static

Commit or rollback ACL statement (and transaction), close tables which it has opened and release metadata locks.

Note

In case of failure to commit transaction we try to restore correct state of in-memory structures by reloading privileges.

Return values

False	- Success.
True	- Error.

acl_notify_htons()

void acl_notify_htons	(	THD *	thd,
		enum_sql_command	operation,
		const List< LEX_USER > *	users,
		std::set< LEX_USER * > *	rewrite_users,
		const List< LEX_CSTRING > *	dynamic_privs
	)

acl_print_ha_error()

void acl_print_ha_error

(

int

handler_error

)

Take a handler error and generate the mysql error ER_ACL_OPERATION_FAILED containing original text of HA error.

Parameters

handler_error

an error number resulted from storage engine

acl_tables_setup()

static void acl_tables_setup ( Table_ref *  tables, thr_lock_type  lock_type, enum_mdl_type  mdl_type  )

static

Construct Table_ref array for ACL tables.

Parameters

[in,out]	tables	Table_ref array
[in]	lock_type	Read or Write
[in]	mdl_type	MDL to be used

acl_tables_setup_for_read()

void acl_tables_setup_for_read

(

Table_ref *

tables

)

Setup ACL tables to be opened in read mode.

Prepare references to all of the grant tables in the order of the ACL_TABLES enum.

Parameters

[in,out]

tables

Table handles

acl_tables_setup_for_write_and_acquire_mdl()

static bool acl_tables_setup_for_write_and_acquire_mdl ( THD *  thd, Table_ref *  tables  )

static

Setup ACL tables to be opened in write mode.

Prepare references to all of the grant tables in the order of the ACL_TABLES enum.

Obtain locks on required MDLs upfront.

Parameters

[in]	thd	THD handle
[in,out]	tables	Table handles

Returns

Status of MDL acquisition

Return values

false	OK
true	Error

check_engine_type_for_acl_table()

bool check_engine_type_for_acl_table	(	Table_ref *	tables,
		bool	report_error
	)

Check that every ACL table has a supported storage engine (InnoDB).

Report error if table's engine type is not supported.

Parameters

tables	Pointer to TABLES_LIST of ACL tables to check.
report_error	If true report error to the client/diagnostic area, otherwise write a warning to the error log.

Returns

bool

Return values

false	OK
true	some of ACL tables has an unsupported engine type.

commit_and_close_mysql_tables()

void commit_and_close_mysql_tables

(

THD *

thd

)

A helper function to commit statement transaction and close ACL tables after reading some data from them as part of FLUSH PRIVILEGES statement or during server initialization.

Note

We assume that we have only read from the tables so commit can't fail.

See also

close_mysql_tables().

Note

This function also rollbacks the transaction if rollback was requested (e.g. as result of deadlock).

get_access()

Access_bitmask get_access	(	TABLE *	form,
		uint	fieldnr,
		uint *	next_field
	)

get_grantor()

static void get_grantor ( THD *  thd, char *  grantor  )

static

handle_grant_table()

int handle_grant_table	(	THD *	,
		Table_ref *	tables,
		ACL_TABLES	table_no,
		bool	drop,
		LEX_USER *	user_from,
		LEX_USER *	user_to
	)

Handle a privilege table.

Parameters

tables	The array with the four open tables.
table_no	The number of the table to handle (0..4).
drop	If user_from is to be dropped.
user_from	The the user to be searched/dropped/renamed.
user_to	The new name for the user if to be renamed, NULL otherwise.

This function scans through following tables: mysql.user, mysql.db, mysql.tables_priv, mysql.columns_priv, mysql.procs_priv, mysql.proxies_priv. For all above tables, we do an index scan and then iterate over the found records do following: Delete from grant table if drop is true. Update in grant table if drop is false and user_to is not NULL. Search in grant table if drop is false and user_to is NULL.

Returns

Operation result

Return values

0	OK, but no record matched.
<	0 Error.
>	0 At least one record matched.

is_acl_table()

bool is_acl_table

(

const TABLE *

table

)

Check if given TABLE* is a ACL table name.

Parameters

table

TABLE object.

Returns

bool

Return values

true	If it is a ACL table, otherwise false.

is_acl_table_name()

bool is_acl_table_name

(

const char *

name

)

Check if given table name is a ACL table name.

Parameters

name	Table name.

Returns

bool

Return values

true	If it is a ACL table, otherwise false.

log_and_commit_acl_ddl()

bool log_and_commit_acl_ddl	(	THD *	thd,
		bool	transactional_tables,
		std::set< LEX_USER * > *	extra_users,
		Rewrite_params *	rewrite_params,
		bool	extra_error,
		bool	write_to_binlog,
		Lock_state_list *	modified_user_lock_state_list
	)

modify_grant_table()

static int modify_grant_table ( TABLE *  table, Field *  host_field, Field *  user_field, LEX_USER *  user_to  )

static

Modify a privilege table.

Parameters

table	The table to modify.
host_field	The host name field.
user_field	The user name field.
user_to	The new name for the user if to be renamed, NULL otherwise.

Note

Update user/host in the current record if user_to is not NULL. Delete the current record if user_to is NULL.

Return values

0	OK.
!=	0 Error.

open_grant_tables()

int open_grant_tables	(	THD *	thd,
		Table_ref *	tables,
		bool *	transactional_tables
	)

Open the grant tables.

Parameters

	thd	The current thread.
[in,out]	tables	Array of ACL_TABLES::LAST_ENTRY table list elements which will be used for opening tables.
[out]	transactional_tables	Set to true if one of grant tables is transactional, false otherwise.

Return values

1	Skip GRANT handling during replication.
0	OK.
<	0 Error.

Note

IX Backup Lock is implicitly acquired as side effect of calling this function.

replace_column_table()

int replace_column_table	(	THD *	thd,
		GRANT_TABLE *	g_t,
		TABLE *	table,
		const LEX_USER &	combo,
		List< LEX_COLUMN > &	columns,
		const char *	db,
		const char *	table_name,
		Access_bitmask	rights,
		bool	revoke_grant
	)

Update record in the table mysql.columns_priv.

Parameters

thd	Current thread execution context.
g_t	Pointer to a cached table grant object
table	Pointer to a TABLE object for open mysql.columns_priv table
combo	Pointer to a LEX_USER object containing info about a user being processed
columns	List of columns to give/revoke grant
db	Database name of table for which column privileges are modified
table_name	Name of table for which column privileges are modified
rights	Table level grant
revoke_grant	Set to true if this is a REVOKE command

Returns

Operation result

Return values

0	OK.
<	0 System error or storage engine error happen
>	0 Error in handling current user entry but still can continue processing subsequent user specified in the ACL statement.

replace_db_table()

int replace_db_table	(	THD *	thd,
		TABLE *	table,
		const char *	db,
		const LEX_USER &	combo,
		Access_bitmask	rights,
		bool	revoke_grant
	)

change grants in the mysql.db table.

Parameters

thd	Current thread execution context.
table	Pointer to a TABLE object for opened mysql.db table.
db	Database name of table for which column privileges are modified.
combo	Pointer to a LEX_USER object containing info about a user being processed.
rights	Database level grant.
revoke_grant	Set to true if this is a REVOKE command.

Returns

Operation result

Return values

0	OK.
1	Error in handling current user entry but still can continue processing subsequent user specified in the ACL statement.
<	0 Error.

replace_proxies_priv_table()

int replace_proxies_priv_table	(	THD *	thd,
		TABLE *	table,
		const LEX_USER *	user,
		const LEX_USER *	proxied_user,
		bool	with_grant_arg,
		bool	revoke_grant
	)

Insert, update or remove a record in the mysql.proxies_priv table.

Parameters

thd	The current thread.
table	Pointer to a TABLE object for opened mysql.proxies_priv table.
user	Information about user being handled.
proxied_user	Information about proxied user being handled.
with_grant_arg	True if a user is allowed to execute GRANT, else false.
revoke_grant	Set to true if this is REVOKE command.

Returns

Operation result.

Return values

0	OK.
1	Error in handling current user entry but still can continue processing subsequent user specified in the ACL statement.
<	0 Error.

replace_routine_table()

int replace_routine_table	(	THD *	thd,
		GRANT_NAME *	grant_name,
		TABLE *	table,
		const LEX_USER &	combo,
		const char *	db,
		const char *	routine_name,
		bool	is_proc,
		Access_bitmask	rights,
		bool	revoke_grant
	)

Search and create/update a record for the routine requested.

Parameters

thd	The current thread.
grant_name	Cached info about stored routine.
table	Pointer to a TABLE object for open mysql.procs_priv table.
combo	User information.
db	Database name for stored routine.
routine_name	Name for stored routine.
is_proc	True for stored procedure, false for stored function.
rights	Rights requested.
revoke_grant	Set to true if a REVOKE command is executed.

Returns

Operation result

Return values

0	OK.
<	0 System error or storage engine error happen
>	0 Error in handling current routine entry but still can continue processing subsequent user specified in the ACL statement.

replace_table_table()

int replace_table_table	(	THD *	thd,
		GRANT_TABLE *	grant_table,
		std::unique_ptr< GRANT_TABLE, Destroy_only< GRANT_TABLE > > *	deleted_grant_table,
		TABLE *	table,
		const LEX_USER &	combo,
		const char *	db,
		const char *	table_name,
		Access_bitmask	rights,
		Access_bitmask	col_rights,
		bool	revoke_grant
	)

Search and create/update a record for requested table privileges.

Parameters

thd	The current thread.
grant_table	Cached info about table/columns privileges.
deleted_grant_table	If non-nullptr and grant is removed from column cache, it is returned here instead of being destroyed.
table	Pointer to a TABLE object for open mysql.tables_priv table.
combo	User information.
db	Database name of table to give grant.
table_name	Name of table to give grant.
rights	Table privileges to set/update.
col_rights	Column privileges to set/update.
revoke_grant	Set to true if a REVOKE command is executed.

Returns

Operation result

Return values

0	OK.
<	0 System error or storage engine error happen.
1	No entry for request.

Variable Documentation

ACL_TABLE_NAMES

const char* ACL_TABLE_NAMES[MAX_ACL_TABLE_NAMES]

static

Initial value:

= {
    "user",          "db",
    "tables_priv",   "columns_priv",
    "procs_priv",    "proxies_priv",
    "role_edges",    "default_roles",
    "global_grants", "password_history"}

initialized

bool initialized

extern

MAX_ACL_TABLE_NAMES

const int MAX_ACL_TABLE_NAMES = 10

static

mysql_columns_priv_table_fields

const TABLE_FIELD_TYPE mysql_columns_priv_table_fields[MYSQL_COLUMNS_PRIV_FIELD_COUNT]

static

Initial value:

= {
        {{STRING_WITH_LEN("Host")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Db")}, {STRING_WITH_LEN("char(64)")}, {nullptr, 0}},
        {{STRING_WITH_LEN("User")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Table_name")},
         {STRING_WITH_LEN("char(64)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Column_name")},
         {STRING_WITH_LEN("char(64)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Timestamp")},
         {STRING_WITH_LEN("timestamp")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Column_priv")},
         {STRING_WITH_LEN("set('Select','Insert','Update','References')")},
         {STRING_WITH_LEN("utf8mb3")}}}

mysql_db_table_fields

const TABLE_FIELD_TYPE mysql_db_table_fields[MYSQL_DB_FIELD_COUNT]

static

mysql_default_roles_table_fields

const TABLE_FIELD_TYPE mysql_default_roles_table_fields[MYSQL_DEFAULT_ROLES_FIELD_COUNT]

static

Initial value:

= {
        {{STRING_WITH_LEN("HOST")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("USER")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("DEFAULT_ROLE_HOST")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("DEFAULT_ROLE_USER")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}}}

mysql_dynamic_priv_table_fields

const TABLE_FIELD_TYPE mysql_dynamic_priv_table_fields[MYSQL_DYNAMIC_PRIV_FIELD_COUNT]

static

Initial value:

= {
        {{STRING_WITH_LEN("USER")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("HOST")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("PRIV")},
         {STRING_WITH_LEN("char(32)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("WITH_GRANT_OPTION")},
         {STRING_WITH_LEN("enum('N','Y')")},
         {nullptr, 0}}}

mysql_password_history_table_fields

const TABLE_FIELD_TYPE mysql_password_history_table_fields[MYSQL_PASSWORD_HISTORY_FIELD_COUNT]

static

Initial value:

= {
        {{STRING_WITH_LEN("Host")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("User")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Password_timestamp")},
         {STRING_WITH_LEN("timestamp")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Password")},
         {STRING_WITH_LEN("text")},
         {nullptr, 0}}}

mysql_procs_priv_table_fields

const TABLE_FIELD_TYPE mysql_procs_priv_table_fields[MYSQL_PROCS_PRIV_FIELD_COUNT]

static

Initial value:

= {
        {{STRING_WITH_LEN("Host")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Db")}, {STRING_WITH_LEN("char(64)")}, {nullptr, 0}},
        {{STRING_WITH_LEN("User")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Routine_name")},
         {STRING_WITH_LEN("char(64)")},
         {STRING_WITH_LEN("utf8mb3")}},
        {{STRING_WITH_LEN("Routine_type")},
         {STRING_WITH_LEN("enum('FUNCTION','PROCEDURE')")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Grantor")},
         {STRING_WITH_LEN("varchar(288)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Proc_priv")},
         {STRING_WITH_LEN("set('Execute','Alter Routine','Grant')")},
         {STRING_WITH_LEN("utf8mb3")}},
        {{STRING_WITH_LEN("Timestamp")},
         {STRING_WITH_LEN("timestamp")},
         {nullptr, 0}}}

mysql_proxies_priv_table_fields

const TABLE_FIELD_TYPE mysql_proxies_priv_table_fields[MYSQL_PROXIES_PRIV_FIELD_COUNT]

static

Initial value:

= {
        {{STRING_WITH_LEN("Host")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("User")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Proxied_host")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Proxied_user")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("With_grant")},
         {STRING_WITH_LEN("tinyint")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Grantor")},
         {STRING_WITH_LEN("varchar(288)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Timestamp")},
         {STRING_WITH_LEN("timestamp")},
         {nullptr, 0}}}

mysql_role_edges_table_fields

const TABLE_FIELD_TYPE mysql_role_edges_table_fields[MYSQL_ROLE_EDGES_FIELD_COUNT]

static

Initial value:

= {
        {{STRING_WITH_LEN("FROM_HOST")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("FROM_USER")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("TO_HOST")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("TO_USER")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("WITH_ADMIN_OPTION")},
         {STRING_WITH_LEN("enum('N','Y')")},
         {STRING_WITH_LEN("utf8mb3")}}}

mysql_tables_priv_table_fields

const TABLE_FIELD_TYPE mysql_tables_priv_table_fields[MYSQL_TABLES_PRIV_FIELD_COUNT]

static

Initial value:

= {
        {{STRING_WITH_LEN("Host")},
         {STRING_WITH_LEN("char(255)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Db")}, {STRING_WITH_LEN("char(64)")}, {nullptr, 0}},
        {{STRING_WITH_LEN("User")},
         {STRING_WITH_LEN("char(" USERNAME_CHAR_LENGTH_STR ")")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Table_name")},
         {STRING_WITH_LEN("char(64)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Grantor")},
         {STRING_WITH_LEN("varchar(288)")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Timestamp")},
         {STRING_WITH_LEN("timestamp")},
         {nullptr, 0}},
        {{STRING_WITH_LEN("Table_priv")},
         {STRING_WITH_LEN("set('Select','Insert','Update','Delete','Create',"
                          "'Drop','Grant','References','Index','Alter',"
                          "'Create View','Show view','Trigger')")},
         {STRING_WITH_LEN("utf8mb3")}},
        {{STRING_WITH_LEN("Column_priv")},
         {STRING_WITH_LEN("set('Select','Insert','Update','References')")},
         {STRING_WITH_LEN("utf8mb3")}}}

mysql_user_table_fields

const TABLE_FIELD_TYPE mysql_user_table_fields[MYSQL_USER_FIELD_COUNT]

static