MDEV-7268 Column of table cannot be converted from type 'decimal(0,?)' to type ' 'decimal(10,7)'

Changing the error message to:
 "...from type 'decimal(0,?)/*old*/' to type ' 'decimal(10,7)'..."
So it's now clear that the master data type is OLD decimal.

mysql-test/suite/rpl/r/rpl_old_decimal.result

+include/master-slave.inc
+[connection master]
+CREATE TABLE t1dec102 (a DECIMAL(10,2));
+INSERT INTO t1dec102 VALUES(999.99);
+call mtr.add_suppression("Slave SQL.*Column 0 of table .* cannot be converted from type.* Error_code: 1677");
+include/wait_for_slave_sql_error_and_skip.inc [errno=1677]
+Last_SQL_Error = 'Column 0 of table 'test.t1dec102' cannot be converted from type 'decimal(0,?)/*old*/' to type 'decimal(10,2)''
+DROP TABLE t1dec102;
+include/rpl_end.inc

mysql-test/suite/rpl/t/rpl_old_decimal.test

+--source include/have_binlog_format_row.inc
+--source include/master-slave.inc
+
+
+--connection slave
+CREATE TABLE t1dec102 (a DECIMAL(10,2));
+
+--connection master
+let $MYSQLD_DATADIR= `select @@datadir`;
+
+--copy_file std_data/old_decimal/t1dec102.frm $MYSQLD_DATADIR/test/t1dec102.frm
+--copy_file std_data/old_decimal/t1dec102.MYD $MYSQLD_DATADIR/test/t1dec102.MYD
+--copy_file std_data/old_decimal/t1dec102.MYI $MYSQLD_DATADIR/test/t1dec102.MYI
+INSERT INTO t1dec102 VALUES(999.99);
+
+--let $slave_sql_errno=1677
+--let $show_slave_sql_error= 1
+call mtr.add_suppression("Slave SQL.*Column 0 of table .* cannot be converted from type.* Error_code: 1677");
+--source include/wait_for_slave_sql_error_and_skip.inc
+
+--connection master
+DROP TABLE t1dec102;
+--sync_slave_with_master
+
+--source include/rpl_end.inc

sql/rpl_utility.cc

@@ -417,7 +417,7 @@ void show_sql_type(enum_field_types type, uint16 metadata, String *str, CHARSET_
       CHARSET_INFO *cs= str->charset();
       uint32 length=
         cs->cset->snprintf(cs, (char*) str->ptr(), str->alloced_length(),
-                           "decimal(%d,?)", metadata);
+                           "decimal(%d,?)/*old*/", metadata);
       str->length(length);
     }
     break;