DM: Support MariaDB Xid binlog status (#12408)

close #12407

Author: dveeden

dm/pkg/binlog/event/util.go

@@ -311,6 +311,7 @@ const (
 	QSqlRequirePrimaryKey
 	QDefaultTableEncryption
 	QHrnow = 128
+	QXid   = 129
 )
 
 // https://dev.mysql.com/doc/internals/en/query-event.html
@@ -335,6 +336,8 @@ var statusVarsFixedLength = map[byte]int{
 	QDefaultTableEncryption:       1,
 	// https://github.com/MariaDB/server/blob/94b45787045677c106a25ebb5aaf1273040b2ff6/sql/log_event.cc#L1619
 	QHrnow: 3,
+	// https://mariadb.com/docs/server/reference/clientserver-protocol/replication-protocol/query_event#q_xid-0x81
+	QXid: 8,
 }
 
 // getSQLMode gets SQL mode from binlog statusVars, still could return a reasonable value if found error.

dm/pkg/binlog/event/util_test.go

@@ -124,6 +124,17 @@ func TestStatusVarsToKV(t *testing.T) {
 			},
 			nil,
 		},
+		{ // QXid
+			[]byte{0, 0, 0, 0, 1, 1, 0, 0, 32, 84, 0, 0, 0, 0, 6, 3, 115, 116, 100, 4, 255, 0, 255, 0, 0, 9, 129, 134, 9, 0, 0, 0, 0, 0, 0},
+			map[byte][]byte{
+				0:   {0, 0, 0, 1},
+				1:   {0, 0, 32, 84, 0, 0, 0, 0},
+				4:   {255, 0, 255, 0, 0, 9},
+				6:   {3, 115, 116, 100},
+				129: {134, 9, 0, 0, 0, 0, 0, 0}, // QXid from MariaDB
+			},
+			nil,
+		},
 	}
 
 	for _, test := range testCases {