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We have added a new function, SystemCatalog::upgrade(), which will create a new column in the database and fill it with default values. It uses a reference column to fill the column, which is passed as a std::unordered_map<key, value> value to SystemCatalog::upgrade() function, where key is the target column which needs to be created. In addition, we pass additional std::unordered_map's to SystemCatalog::upgrade() containing information such as the datatypes and colwidths of the target and reference columns, as well as the default value which will be used to fill the target column.