MDEV-9560 Mariadb 10.1 Crashes when replicating from 10.0

when replicating old temporal type fields (that don't store
metadata in the binlog), take the precision from
destination fields.

(this fixes the replication failure, crashes were
fixed in a different commit)

mysql-test/suite/rpl/r/temporal_row-9560,old2new.rdiff

+--- suite/rpl/r/temporal_row-9560.result
++++ suite/rpl/r/temporal_row-9560.reject
+@@ -7,7 +7,7 @@
+ insert into t1 values ('2016-02-15 12:50:06.123');
+ select @@mysql56_temporal_format;
+ @@mysql56_temporal_format
+-0
++1
+ select * from t1;
+ ts
+ 2016-02-15 12:50:06.123

mysql-test/suite/rpl/r/temporal_row-9560.result

+include/master-slave.inc
+[connection master]
+select @@mysql56_temporal_format;
+@@mysql56_temporal_format
+0
+create table t1 (ts timestamp(3), t time(3), dt datetime(3));
+insert into t1 values ('2016-02-15 12:50:06.123', '12:50:06.123', '2016-02-15 12:50:06.123');
+select @@mysql56_temporal_format;
+@@mysql56_temporal_format
+0
+select * from t1;
+ts	t	dt
+2016-02-15 12:50:06.123	12:50:06.123	2016-02-15 12:50:06.123
+drop table t1;
+include/rpl_end.inc

mysql-test/suite/rpl/t/temporal_row-9560-master.opt

+--disable-mysql56-temporal-format

mysql-test/suite/rpl/t/temporal_row-9560.combinations

+[old2old]
+--disable-mysql56-temporal-format
+
+[old2new]
+--enable-mysql56-temporal-format
+

mysql-test/suite/rpl/t/temporal_row-9560.test

+#
+# MDEV-9560 Mariadb 10.1 Crashes when replicating from 10.0
+#
+source include/have_binlog_format_row.inc;
+source include/master-slave.inc;
+
+select @@mysql56_temporal_format;
+create table t1 (ts timestamp(3), t time(3), dt datetime(3));
+insert into t1 values ('2016-02-15 12:50:06.123', '12:50:06.123', '2016-02-15 12:50:06.123');
+
+sync_slave_with_master;
+
+select @@mysql56_temporal_format;
+select * from t1;
+
+connection master;
+drop table t1;
+
+source include/rpl_end.inc;
+

sql/rpl_utility.cc

@@ -991,6 +991,17 @@ TABLE *table_def::create_conversion_table(THD *thd, rpl_group_info *rgi,
       */
       unsigned_flag= static_cast<Field_num*>(target_field)->unsigned_flag;
       break;
+    case MYSQL_TYPE_TIMESTAMP:
+    case MYSQL_TYPE_TIME:
+    case MYSQL_TYPE_DATETIME:
+      /*
+        As we don't know the precision of the temporal field on the master,
+        assume it's the same on master and slave.  This is true when not
+        using conversions so it should be true also when using conversions.
+      */
+      if (target_field->decimals())
+        max_length+= target_field->decimals() + 1;
+      break;
     default:
       break;
     }