MDEV-34716 Allow arbitrary options in CREATE SERVER

The existing syntax for CREATE SERVER

CREATE [OR REPLACE] SERVER [IF NOT EXISTS] server_name
    FOREIGN DATA WRAPPER wrapper_name
    OPTIONS (option [, option] ...)

option:
  { HOST character-literal
  | DATABASE character-literal
  | USER character-literal
  | PASSWORD character-literal
  | SOCKET character-literal
  | OWNER character-literal
  | PORT numeric-literal }

With this change we have:

option:
  { HOST character-literal
  | DATABASE character-literal
  | USER character-literal
  | PASSWORD character-literal
  | SOCKET character-literal
  | OWNER character-literal
  | PORT numeric-literal
  | PORT quoted-numerical-literal
  | identifier character-literal}

We store these options as a JSON field in the mysql.servers system
table. We retain the restriction that PORT needs to be a number, but
also allow it to be a quoted number, so that SHOW CREATE SERVER can be
used for dumping. Without an accompanied implementation of SHOW CREATE
SERVER, some mysqldump tests will fail. Therefore this commit should
be immediately followed by the one implementating SHOW CREATE SERVER,
with testing covering both.

mysql-test/suite/funcs_1/r/is_check_constraints.result

@@ -139,6 +139,7 @@ SELECT * FROM information_schema.check_constraints;
 CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	TABLE_NAME	CONSTRAINT_NAME	LEVEL	CHECK_CLAUSE
 def	db	t1	CONSTRAINT_1	Table	`b` > 0
 def	mysql	global_priv	Priv	Column	json_valid(`Priv`)
+def	mysql	servers	Options	Column	json_valid(`Options`)
 CONNECT con1,localhost, foo,, db;
 SELECT a FROM t1;
 a
@@ -172,6 +173,7 @@ t	CREATE TABLE `t` (
 ) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_uca1400_ai_ci
 select * from information_schema.table_constraints where CONSTRAINT_TYPE='CHECK';
 CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_SCHEMA	TABLE_NAME	CONSTRAINT_TYPE
+def	mysql	Options	mysql	servers	CHECK
 def	mysql	Priv	mysql	global_priv	CHECK
 def	test	CONSTRAINT_1	test	t	CHECK
 def	test	t1	test	t	CHECK
@@ -181,6 +183,7 @@ def	test	tc_1	test	t	CHECK
 select * from information_schema.check_constraints;
 CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	TABLE_NAME	CONSTRAINT_NAME	LEVEL	CHECK_CLAUSE
 def	mysql	global_priv	Priv	Column	json_valid(`Priv`)
+def	mysql	servers	Options	Column	json_valid(`Options`)
 def	test	t	CONSTRAINT_1	Table	`t0` > 0
 def	test	t	t1	Column	`t1` < 0
 def	test	t	t2	Column	`t2` < -1

mysql-test/suite/funcs_1/r/is_columns_mysql.result

@@ -160,6 +160,7 @@ def	mysql	roles_mapping	Role	3	''	NO	char	128	384	NULL	NULL	NULL	utf8mb3	utf8mb3
 def	mysql	roles_mapping	User	2	''	NO	char	128	384	NULL	NULL	NULL	utf8mb3	utf8mb3_bin	char(128)	PRI		select,insert,update,references		NEVER	NULL	NO	NO
 def	mysql	servers	Db	3	''	NO	char	64	192	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	char(64)			select,insert,update,references		NEVER	NULL	NO	NO
 def	mysql	servers	Host	2	''	NO	varchar	2048	6144	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(2048)			select,insert,update,references		NEVER	NULL	NO	NO
+def	mysql	servers	Options	10	'{}'	NO	longtext	4294967295	4294967295	NULL	NULL	NULL	utf8mb4	utf8mb4_bin	longtext			select,insert,update,references		NEVER	NULL	NO	NO
 def	mysql	servers	Owner	9	''	NO	varchar	512	1536	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	varchar(512)			select,insert,update,references		NEVER	NULL	NO	NO
 def	mysql	servers	Password	5	''	NO	char	64	192	NULL	NULL	NULL	utf8mb3	utf8mb3_general_ci	char(64)			select,insert,update,references		NEVER	NULL	NO	NO
 def	mysql	servers	Port	6	0	NO	int	NULL	NULL	10	0	NULL	NULL	NULL	int(4)			select,insert,update,references		NEVER	NULL	NO	NO
@@ -495,6 +496,7 @@ NULL	mysql	servers	Port	int	NULL	NULL	NULL	NULL	int(4)
 3.0000	mysql	servers	Socket	char	108	324	utf8mb3	utf8mb3_general_ci	char(108)
 3.0000	mysql	servers	Wrapper	char	64	192	utf8mb3	utf8mb3_general_ci	char(64)
 3.0000	mysql	servers	Owner	varchar	512	1536	utf8mb3	utf8mb3_general_ci	varchar(512)
+1.0000	mysql	servers	Options	longtext	4294967295	4294967295	utf8mb4	utf8mb4_bin	longtext
 NULL	mysql	slow_log	start_time	timestamp	NULL	NULL	NULL	NULL	timestamp(6)
 1.0000	mysql	slow_log	user_host	mediumtext	16777215	16777215	utf8mb3	utf8mb3_general_ci	mediumtext
 NULL	mysql	slow_log	query_time	time	NULL	NULL	NULL	NULL	time(6)

mysql-test/suite/funcs_1/r/is_table_constraints.result

@@ -81,6 +81,7 @@ def	mysql	PRIMARY	mysql	proc
 def	mysql	PRIMARY	mysql	procs_priv
 def	mysql	PRIMARY	mysql	proxies_priv
 def	mysql	Host	mysql	roles_mapping
+def	mysql	Options	mysql	servers
 def	mysql	PRIMARY	mysql	servers
 def	mysql	PRIMARY	mysql	tables_priv
 def	mysql	PRIMARY	mysql	table_stats

mysql-test/suite/funcs_1/r/is_table_constraints_mysql.result

@@ -30,6 +30,7 @@ def	mysql	PRIMARY	mysql	proc	PRIMARY KEY
 def	mysql	PRIMARY	mysql	procs_priv	PRIMARY KEY
 def	mysql	PRIMARY	mysql	proxies_priv	PRIMARY KEY
 def	mysql	Host	mysql	roles_mapping	UNIQUE
+def	mysql	Options	mysql	servers	CHECK
 def	mysql	PRIMARY	mysql	servers	PRIMARY KEY
 def	mysql	PRIMARY	mysql	tables_priv	PRIMARY KEY
 def	mysql	PRIMARY	mysql	table_stats	PRIMARY KEY

mysql-test/suite/funcs_1/r/is_tables_mysql.result

@@ -515,7 +515,7 @@ TABLE_SCHEMA	mysql
 TABLE_NAME	servers
 TABLE_TYPE	BASE TABLE
 ENGINE	MYISAM_OR_MARIA
-VERSION	10
+VERSION	11
 ROW_FORMAT	DYNAMIC_OR_PAGE
 TABLE_ROWS	#TBLR#
 AVG_ROW_LENGTH	#ARL#