Function get_select_field_pos

sql/handler.cc:9170–9181

int get_select_field_pos(Alter_info *alter_info, bool versioned)
{
  int select_field_pos= alter_info->field_count();
  if (alter_info->select_field_count && versioned &&
      /*
        ALTER_PARSER_ADD_COLUMN indicates system fields was created implicitly,
        select_field_count guarantees it's not ALTER TABLE
      */
      alter_info->flags & ALTER_PARSER_ADD_COLUMN)
    select_field_pos-= 2;
  return select_field_pos;
}


bool Table_scope_and_contents_source_st::vers_check_system_fields(