Simplify rgi->get_table_data call

sql/rpl_record.cc

@@ -223,12 +223,10 @@ int unpack_row(rpl_group_info *rgi, TABLE *table, uint const colcnt,
   // The "current" null bits
   unsigned int null_bits= *null_ptr++;
   uint i= 0;
-  table_def *tabledef= NULL;
-  TABLE *conv_table= NULL;
-  const Copy_field *copy_fields;
-  const Copy_field *copy_fields_end;
-  bool table_found= rgi && rgi->get_table_data(table, &tabledef, &conv_table,
-                                               &copy_fields, &copy_fields_end);
+  Rpl_table_data rpl_data{};
+  bool table_found= rgi && rgi->get_table_data(table, &rpl_data);
+  const table_def *tabledef= rpl_data.tabledef;
+  const TABLE *conv_table= rpl_data.conv_table;
   DBUG_PRINT("debug", ("Table data: table_found: %d, tabldef: %p, conv_table: %p",
                        table_found, tabledef, conv_table));
   DBUG_ASSERT(table_found);
@@ -350,7 +348,7 @@ int unpack_row(rpl_group_info *rgi, TABLE *table, uint const colcnt,
         If copy_fields is set, it means we are doing an online alter table,
         and will use copy_fields set up in copy_data_between_tables
       */
-      if (conv_field && !copy_fields)
+      if (conv_field && !rpl_data.is_online_alter())
       {
         Copy_field copy;
 #ifndef DBUG_OFF
@@ -382,9 +380,10 @@ int unpack_row(rpl_group_info *rgi, TABLE *table, uint const colcnt,
     i++;
   }
 
-  if (copy_fields)
+  if (rpl_data.is_online_alter())
   {
-    for (const auto *copy=copy_fields; copy != copy_fields_end; copy++)
+    for (const auto *copy=rpl_data.copy_fields;
+         copy != rpl_data.copy_fields_end; copy++)
     {
       copy->do_copy(copy);
     }

sql/rpl_rli.h

@@ -669,6 +669,23 @@ struct start_alter_info
   mysql_cond_t start_alter_cond;
 };
 
+struct Rpl_table_data
+{
+  const table_def *tabledef;
+  TABLE *conv_table;
+  const Copy_field *copy_fields;
+  const Copy_field *copy_fields_end;
+  Rpl_table_data& operator =(const RPL_TABLE_LIST &rpl_table_list)
+  {
+    tabledef= &rpl_table_list.m_tabledef;
+    conv_table= rpl_table_list.m_conv_table;
+    copy_fields= rpl_table_list.m_online_alter_copy_fields;
+    copy_fields_end= rpl_table_list.m_online_alter_copy_fields_end;
+    return *this;
+  }
+  bool is_online_alter() const { return copy_fields != NULL; }
+};
+
 /*
   This is data for various state needed to be kept for the processing of
   one event group (transaction) during replication.
@@ -941,24 +958,20 @@ struct rpl_group_info
     }
   }
 
-  bool get_table_data(TABLE *table_arg, table_def **tabledef_var,
-          TABLE **conv_table_var,
-          const Copy_field *copy[], const Copy_field **copy_end) const
+  bool get_table_data(const TABLE *table_arg, Rpl_table_data *table_data) const
   {
-    DBUG_ASSERT(tabledef_var && conv_table_var);
+    DBUG_ASSERT(table_data);
     for (TABLE_LIST *ptr= tables_to_lock ; ptr != NULL ; ptr= ptr->next_global)
       if (ptr->table == table_arg)
       {
         auto *rpl_table_list= static_cast<RPL_TABLE_LIST*>(ptr);
         DBUG_ASSERT(rpl_table_list->m_tabledef_valid);
-        *tabledef_var= &rpl_table_list->m_tabledef;
-        *conv_table_var= rpl_table_list->m_conv_table;
-        *copy= rpl_table_list->m_online_alter_copy_fields;
-        *copy_end= rpl_table_list->m_online_alter_copy_fields_end;
+        *table_data= *rpl_table_list;
+
         DBUG_PRINT("debug", ("Fetching table data for table %s.%s:"
                              " tabledef: %p, conv_table: %p",
                              table_arg->s->db.str, table_arg->s->table_name.str,
-                             *tabledef_var, *conv_table_var));
+                             table_data->tabledef, table_data->conv_table));
         return true;
       }
     return false;