MDEV-22420 DDL on temporary object is prohibited when XA is in prepare state

The parser must reject DDL operations on temporary objects when
they may modify or alter such object, including temporary tables and sequences.
The rejection is regardless (has been already in place for bin-loggable DML:s)
of the binlogging capability of the server or connection.

The patch implements the requirement. A binlog test is added.

Author: andrelkin

mysql-test/suite/binlog/r/binlog_empty_xa_prepared.result

@@ -0,0 +1,31 @@
+CREATE TEMPORARY SEQUENCE seq_1;
+XA START '3';
+CREATE TEMPORARY TABLE tmp_1(c INT);
+XA END '3';
+XA PREPARE '3';
+DROP TEMPORARY TABLE tmp_1;
+ERROR XAE07: XAER_RMFAIL: The command cannot be executed when global transaction is in the  PREPARED state
+ALTER TABLE tmp_1 DROP COLUMN c;
+ERROR XAE07: XAER_RMFAIL: The command cannot be executed when global transaction is in the  PREPARED state
+DROP TEMPORARY SEQUENCE seq_1;
+ERROR XAE07: XAER_RMFAIL: The command cannot be executed when global transaction is in the  PREPARED state
+ALTER SEQUENCE seq_1 INCREMENT BY 1;
+ERROR XAE07: XAER_RMFAIL: The command cannot be executed when global transaction is in the  PREPARED state
+CREATE TEMPORARY TABLE tmp_2(c INT);
+ERROR XAE07: XAER_RMFAIL: The command cannot be executed when global transaction is in the  PREPARED state
+CREATE TEMPORARY SEQUENCE seq_2;
+ERROR XAE07: XAER_RMFAIL: The command cannot be executed when global transaction is in the  PREPARED state
+XA ROLLBACK '3';
+# Proof of  correct logging incl empty XA-PREPARE
+include/show_binlog_events.inc
+Log_name	Pos	Event_type	Server_id	End_log_pos	Info
+master-bin.000001	#	Gtid	#	#	GTID #-#-#
+master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY SEQUENCE seq_1
+master-bin.000001	#	Gtid	#	#	BEGIN GTID #-#-#
+master-bin.000001	#	Query	#	#	use `test`; CREATE TEMPORARY TABLE tmp_1(c INT)
+master-bin.000001	#	Query	#	#	COMMIT
+master-bin.000001	#	Gtid	#	#	XA START X'33',X'',1 GTID #-#-#
+master-bin.000001	#	Query	#	#	XA END X'33',X'',1
+master-bin.000001	#	XA_prepare	#	#	XA PREPARE X'33',X'',1
+master-bin.000001	#	Gtid	#	#	GTID #-#-#
+master-bin.000001	#	Query	#	#	XA ROLLBACK X'33',X'',1

mysql-test/suite/binlog/t/binlog_empty_xa_prepared.test

@@ -0,0 +1,35 @@
+# The test verifies execution and binary logging of user XA that produce empty
+# XA-PREPARE group of events.
+
+--source include/have_binlog_format_mixed.inc
+--source include/have_innodb.inc
+
+
+# MDEV-22420 DDL on temporary object is prohibited when XA is in prepare state
+
+# Temporary sequnce may not be created within a transaction
+CREATE TEMPORARY SEQUENCE seq_1;
+
+XA START '3';
+CREATE TEMPORARY TABLE tmp_1(c INT);
+XA END '3';
+XA PREPARE '3';
+--error ER_XAER_RMFAIL
+DROP TEMPORARY TABLE tmp_1;
+--error ER_XAER_RMFAIL
+ALTER TABLE tmp_1 DROP COLUMN c;
+--error ER_XAER_RMFAIL
+DROP TEMPORARY SEQUENCE seq_1;
+--error ER_XAER_RMFAIL
+ALTER SEQUENCE seq_1 INCREMENT BY 1;
+
+--error ER_XAER_RMFAIL
+CREATE TEMPORARY TABLE tmp_2(c INT);
+--error ER_XAER_RMFAIL
+CREATE TEMPORARY SEQUENCE seq_2;
+
+# Cleanup
+XA ROLLBACK '3';
+
+--echo # Proof of  correct logging incl empty XA-PREPARE
+--source include/show_binlog_events.inc

sql/sql_parse.cc

@@ -4890,6 +4890,8 @@ mysql_execute_command(THD *thd)
     }
     else
     {
+      if (thd->transaction->xid_state.check_has_uncommitted_xa())
+        goto error;
       status_var_decrement(thd->status_var.com_stat[lex->sql_command]);
       status_var_increment(thd->status_var.com_drop_tmp_table);