MDEV-28829 Deprecate spider_semi_table_lock and spider_semi_table_lock_connection

When the variable, spider_semi_table_lock, is 1, Spider sends
LOCK TABLES before each SQL execution. The feature is for
non-transactional remote tables and adds some overhead to query
executions.

We change the default value of the plugin variable to 0 and then
deprecate the variable because it is rare to use non-transactional
engines these days and the variable complicates the code.

The variable, spider_semi_table_lock_connection, should be too
deprecated because it is for tweaking the semi-table locking.

storage/spider/mysql-test/spider/r/variable_deprecation.result

@@ -211,6 +211,35 @@ Warnings:
 Warning	1287	The table parameter 'init_sql_alloc_size' is deprecated and will be removed in a future release
 DROP TABLE tbl_a;
 DROP TABLE tbl_b;
+# MDEV-28829 Deprecate spider_semi_table_lock and spider_semi_table_lock_connection
+SET spider_semi_table_lock = 1;
+Warnings:
+Warning	1287	'@@spider_semi_table_lock' is deprecated and will be removed in a future release
+SHOW VARIABLES LIKE "spider_semi_table_lock";
+Variable_name	Value
+spider_semi_table_lock	1
+CREATE TABLE tbl_a (a INT) ENGINE=Spider COMMENT='stl "1"';
+Warnings:
+Warning	1287	The table parameter 'stl' is deprecated and will be removed in a future release
+CREATE TABLE tbl_b (a INT) ENGINE=Spider COMMENT='semi_table_lock "1"';
+Warnings:
+Warning	1287	The table parameter 'semi_table_lock' is deprecated and will be removed in a future release
+DROP TABLE tbl_a;
+DROP TABLE tbl_b;
+SET spider_semi_table_lock_connection = 0;
+Warnings:
+Warning	1287	'@@spider_semi_table_lock_connection' is deprecated and will be removed in a future release
+SHOW VARIABLES LIKE "spider_semi_table_lock_connection";
+Variable_name	Value
+spider_semi_table_lock_connection	0
+CREATE TABLE tbl_a (a INT) ENGINE=Spider COMMENT='stc "0"';
+Warnings:
+Warning	1287	The table parameter 'stc' is deprecated and will be removed in a future release
+CREATE TABLE tbl_b (a INT) ENGINE=Spider COMMENT='semi_table_lock_connection "0"';
+Warnings:
+Warning	1287	The table parameter 'semi_table_lock_connection' is deprecated and will be removed in a future release
+DROP TABLE tbl_a;
+DROP TABLE tbl_b;
 DROP DATABASE auto_test_local;
 for master_1
 for child2

storage/spider/mysql-test/spider/t/variable_deprecation.test

@@ -126,6 +126,23 @@ eval CREATE TABLE tbl_b (a INT) $MASTER_1_ENGINE COMMENT='init_sql_alloc_size "1
 DROP TABLE tbl_a;
 DROP TABLE tbl_b;
 
+--echo # MDEV-28829 Deprecate spider_semi_table_lock and spider_semi_table_lock_connection
+SET spider_semi_table_lock = 1;
+SHOW VARIABLES LIKE "spider_semi_table_lock";
+eval CREATE TABLE tbl_a (a INT) $MASTER_1_ENGINE COMMENT='stl "1"';
+eval CREATE TABLE tbl_b (a INT) $MASTER_1_ENGINE COMMENT='semi_table_lock "1"';
+
+DROP TABLE tbl_a;
+DROP TABLE tbl_b;
+
+SET spider_semi_table_lock_connection = 0;
+SHOW VARIABLES LIKE "spider_semi_table_lock_connection";
+eval CREATE TABLE tbl_a (a INT) $MASTER_1_ENGINE COMMENT='stc "0"';
+eval CREATE TABLE tbl_b (a INT) $MASTER_1_ENGINE COMMENT='semi_table_lock_connection "0"';
+
+DROP TABLE tbl_a;
+DROP TABLE tbl_b;
+
 DROP DATABASE auto_test_local;
 
 --disable_query_log

storage/spider/spd_param.cc

@@ -805,11 +805,11 @@ static int spider_param_semi_table_lock_check(
  */
 static MYSQL_THDVAR_INT(
   semi_table_lock, /* name */
-  PLUGIN_VAR_RQCMDARG, /* opt */
+  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_DEPRECATED, /* opt */
   "Table lock during execute a sql", /* comment */
   &spider_param_semi_table_lock_check, /* check */
   NULL, /* update */
-  1, /* def */
+  0, /* def */
   0, /* min */
   1, /* max */
   0 /* blk */
@@ -870,7 +870,7 @@ static int spider_param_semi_table_lock_connection_check(
  */
 static MYSQL_THDVAR_INT(
   semi_table_lock_connection, /* name */
-  PLUGIN_VAR_RQCMDARG, /* opt */
+  PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_DEPRECATED, /* opt */
   "Use different connection if semi_table_lock is enabled", /* comment */
   &spider_param_semi_table_lock_connection_check, /* check */
   spider_var_deprecated_int, /* update */

storage/spider/spd_table.cc

@@ -2460,7 +2460,9 @@ int spider_parse_connect_info(
 #ifdef WITH_PARTITION_STORAGE_ENGINE
           SPIDER_PARAM_INT_WITH_MAX("ssy", sts_sync, 0, 2);
 #endif
+          SPIDER_PARAM_DEPRECATED_WARNING("stc");
           SPIDER_PARAM_INT_WITH_MAX("stc", semi_table_lock_conn, 0, 1);
+          SPIDER_PARAM_DEPRECATED_WARNING("stl");
           SPIDER_PARAM_INT_WITH_MAX("stl", semi_table_lock, 0, 1);
           SPIDER_PARAM_LONGLONG("srs", static_records_for_status, 0);
           SPIDER_PARAM_LONG_LIST_WITH_MAX("svc", tgt_ssl_vscs, 0, 1);
@@ -2608,6 +2610,7 @@ int spider_parse_connect_info(
           SPIDER_PARAM_DEPRECATED_WARNING("internal_offset");
           SPIDER_PARAM_LONGLONG("internal_offset", internal_offset, 0);
           SPIDER_PARAM_INT_WITH_MAX("reset_sql_alloc", reset_sql_alloc, 0, 1);
+          SPIDER_PARAM_DEPRECATED_WARNING("semi_table_lock");
           SPIDER_PARAM_INT_WITH_MAX("semi_table_lock", semi_table_lock, 0, 1);
           SPIDER_PARAM_LONGLONG("quick_page_byte", quick_page_byte, 0);
           SPIDER_PARAM_LONGLONG("quick_page_size", quick_page_size, 0);
@@ -2749,6 +2752,7 @@ int spider_parse_connect_info(
           error_num = connect_string_parse.print_param_error();
           goto error;
         case 26:
+          SPIDER_PARAM_DEPRECATED_WARNING("semi_table_lock_connection");
           SPIDER_PARAM_INT_WITH_MAX(
             "semi_table_lock_connection", semi_table_lock_conn, 0, 1);
           error_num = connect_string_parse.print_param_error();