SQL: system_versioning_transaction_registry default OFF

mysql-test/suite/versioning/common.opt

 --system-versioning-hide=implicit
+--system-versioning-transaction-registry=1
 --plugin-load=versioning

mysql-test/suite/versioning/r/insert.result

@@ -284,11 +284,13 @@ rollback to a;
 commit;
 call verify_vtq;
 No	A	B	C	D
-set global transaction_registry= off;
+set global system_versioning_transaction_registry= off;
 insert into t2(x) values (1);
 insert into t1(x) values (1);
 ERROR HY000: Temporal operation requires `mysql.transaction_registry` (@@system_versioning_transaction_registry).
-set global transaction_registry= on;
+set global system_versioning_transaction_registry= on;
+Warnings:
+Warning	4145	Transaction-based system versioning is EXPERIMENTAL and is subject to change in future.
 create or replace table t1 (
 x int,
 y int as (x) virtual,

mysql-test/suite/versioning/r/trx_id.result

+select @@system_versioning_transaction_registry;
+@@system_versioning_transaction_registry
+0
+create or replace table t1 (
+x int,
+sys_trx_start bigint(20) unsigned generated always as row start,
+sys_trx_end bigint(20) unsigned generated always as row end,
+period for system_time (sys_trx_start, sys_trx_end)
+) with system versioning engine innodb;
+ERROR HY000: Temporal operation requires `mysql.transaction_registry` (@@system_versioning_transaction_registry).
+set global system_versioning_transaction_registry= 1;
+Warnings:
+Warning	4145	Transaction-based system versioning is EXPERIMENTAL and is subject to change in future.
+create or replace table t1 (
+x int,
+sys_trx_start bigint(20) unsigned generated always as row start,
+sys_trx_end bigint(20) unsigned generated always as row end,
+period for system_time (sys_trx_start, sys_trx_end)
+) with system versioning engine innodb;
+insert into t1 (x) values (1);
+set global system_versioning_transaction_registry= 0;
+insert into t1 (x) values (2);
+ERROR HY000: Temporal operation requires `mysql.transaction_registry` (@@system_versioning_transaction_registry).
+delete from t1;
+ERROR HY000: Temporal operation requires `mysql.transaction_registry` (@@system_versioning_transaction_registry).
+update t1 set x= 3;
+ERROR HY000: Temporal operation requires `mysql.transaction_registry` (@@system_versioning_transaction_registry).
+drop table t1;

mysql-test/suite/versioning/t/insert.test

@@ -188,11 +188,11 @@ rollback to a;
 commit;
 call verify_vtq;
 
-set global transaction_registry= off;
+set global system_versioning_transaction_registry= off;
 insert into t2(x) values (1);
 --error ER_VERS_TRT_IS_DISABLED
 insert into t1(x) values (1);
-set global transaction_registry= on;
+set global system_versioning_transaction_registry= on;
 
 # virtual columns
 create or replace table t1 (

mysql-test/suite/versioning/t/trx_id.test

+-- source include/have_innodb.inc
+
+select @@system_versioning_transaction_registry;
+
+--error ER_VERS_TRT_IS_DISABLED
+create or replace table t1 (
+  x int,
+  sys_trx_start bigint(20) unsigned generated always as row start,
+  sys_trx_end bigint(20) unsigned generated always as row end,
+  period for system_time (sys_trx_start, sys_trx_end)
+) with system versioning engine innodb;
+
+set global system_versioning_transaction_registry= 1;
+
+create or replace table t1 (
+  x int,
+  sys_trx_start bigint(20) unsigned generated always as row start,
+  sys_trx_end bigint(20) unsigned generated always as row end,
+  period for system_time (sys_trx_start, sys_trx_end)
+) with system versioning engine innodb;
+
+insert into t1 (x) values (1);
+
+set global system_versioning_transaction_registry= 0;
+--error ER_VERS_TRT_IS_DISABLED
+insert into t1 (x) values (2);
+--error ER_VERS_TRT_IS_DISABLED
+delete from t1;
+--error ER_VERS_TRT_IS_DISABLED
+update t1 set x= 3;
+
+drop table t1;

sql/share/errmsg-utf8.txt

@@ -7928,3 +7928,6 @@ ER_VERS_DUPLICATE_ROW_START_END
 
 ER_VERS_ALREADY_VERSIONED
         eng "Table %`s is already system-versioned"
+
+WARN_VERS_TRT_EXPERIMENTAL
+        eng "Transaction-based system versioning is EXPERIMENTAL and is subject to change in future."

sql/sys_vars.cc

@@ -426,14 +426,19 @@ static Sys_var_enum Sys_vers_alter_history(
 static bool update_transaction_registry(sys_var *self, THD *thd, enum_var_type type)
 {
   use_transaction_registry= opt_transaction_registry;
+  if (use_transaction_registry)
+  {
+    push_warning(thd, Sql_condition::WARN_LEVEL_WARN, WARN_VERS_TRT_EXPERIMENTAL,
+                 ER_THD(thd, WARN_VERS_TRT_EXPERIMENTAL));
+  }
   return false;
 }
 
-static Sys_var_mybool Sys_transaction_registry(
-       "transaction_registry",
-       "Enable or disable update of transaction_registry",
+static Sys_var_mybool Sys_vers_transaction_registry(
+       "system_versioning_transaction_registry",
+       "Enable or disable update of `mysql`.`transaction_registry`",
        GLOBAL_VAR(opt_transaction_registry), CMD_LINE(OPT_ARG),
-       DEFAULT(TRUE), NO_MUTEX_GUARD, NOT_IN_BINLOG,
+       DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG,
        0, ON_UPDATE(update_transaction_registry));
 
 static Sys_var_ulonglong Sys_binlog_cache_size(

sql/table.h

@@ -1499,7 +1499,6 @@ struct TABLE
   int update_virtual_field(Field *vf);
   int update_virtual_fields(handler *h, enum_vcol_update_mode update_mode);
   int update_default_fields(bool update, bool ignore_errors);
-  void vers_update_fields();
   void reset_default_fields();
   inline ha_rows stat_records() { return used_stat_records; }
 
@@ -1558,6 +1557,7 @@ struct TABLE
   ulonglong vers_end_id() const;
 
   int delete_row();
+  void vers_update_fields();
 
 /** Number of additional fields used in versioned tables */
 #define VERSIONING_FIELDS 2