MDEV-19338 InnoDB: Failing assertion: !cursor->index->is_committed()

Call mark_columns_per_binlog_row_image before find_row() to set up table->vcol_set early,
so the virtual column value will be updated after record read (ha_rnd_pos/ha_index_next/etc)
by table->update_virtual_fields() call

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

+include/master-slave.inc
+[connection master]
+connection master;
+create table t1 (
+id int auto_increment,
+data varchar(32),
+virt tinyint as (1),
+primary key (id),
+key virt (virt)
+) engine=innodb default charset=utf8mb4;
+insert into t1 (data) values ('broken');
+update t1 set data='more broken';
+connection slave;
+select * from t1;
+id	data	virt
+1	more broken	1
+connection master;
+drop table t1;
+connection slave;
+include/rpl_end.inc

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

+--source include/have_binlog_format_row.inc
+--source include/master-slave.inc
+--source include/have_innodb.inc
+connection master;
+
+create table t1 (
+  id int auto_increment,
+  data varchar(32),
+  virt tinyint as (1),
+  primary key (id),
+  key virt (virt)
+) engine=innodb default charset=utf8mb4;
+
+insert into t1 (data) values ('broken');
+
+update t1 set data='more broken';
+
+--sync_slave_with_master
+
+select * from t1;
+
+--connection master
+drop table t1;
+
+--sync_slave_with_master
+
+--source include/rpl_end.inc

sql/log_event.cc

@@ -13614,7 +13614,6 @@ int Rows_log_event::find_row(rpl_group_info *rgi)
   if (is_table_scan || is_index_scan)
     issue_long_find_row_warning(get_general_type_code(), m_table->alias.c_ptr(), 
                                 is_index_scan, rgi);
-  table->default_column_bitmaps();
   DBUG_RETURN(error);
 }
 
@@ -13928,6 +13927,12 @@ Update_rows_log_event::do_exec_row(rpl_group_info *rgi)
 #endif /* WSREP_PROC_INFO */
 
   thd_proc_info(thd, message);
+  // Temporary fix to find out why it fails [/Matz]
+  memcpy(m_table->read_set->bitmap, m_cols.bitmap, (m_table->read_set->n_bits + 7) / 8);
+  memcpy(m_table->write_set->bitmap, m_cols_ai.bitmap, (m_table->write_set->n_bits + 7) / 8);
+
+  m_table->mark_columns_per_binlog_row_image();
+  
   int error= find_row(rgi); 
   if (error)
   {
@@ -13997,12 +14002,7 @@ Update_rows_log_event::do_exec_row(rpl_group_info *rgi)
     error= HA_ERR_GENERIC; // in case if error is not set yet
     goto err;
   }
-
-  // Temporary fix to find out why it fails [/Matz]
-  memcpy(m_table->read_set->bitmap, m_cols.bitmap, (m_table->read_set->n_bits + 7) / 8);
-  memcpy(m_table->write_set->bitmap, m_cols_ai.bitmap, (m_table->write_set->n_bits + 7) / 8);
-
-  m_table->mark_columns_per_binlog_row_image();
+  
   error= m_table->file->ha_update_row(m_table->record[1], m_table->record[0]);
   if (error == HA_ERR_RECORD_IS_THE_SAME)
     error= 0;