new_column_from_field

# File activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb, line 81
          def new_column_from_field(table_name, field)
            type_metadata = fetch_type_metadata(field[:Type], field[:Extra])
            if type_metadata.type == :datetime && /\ACURRENT_TIMESTAMP(?:\([0-6]?\))?\z/.match?(field[:Default])
              default, default_function = nil, field[:Default]
            else
              default, default_function = field[:Default], nil
            end

            MySQL::Column.new(
              field[:Field],
              default,
              type_metadata,
              field[:Null] == "YES",
              table_name,
              default_function,
              field[:Collation],
              comment: field[:Comment].presence
            )
          end