marshal_dump

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 124
      def marshal_dump
        # if we get current version during initialization, it happens stack over flow.
        @version = connection.migration_context.current_version
        [@version, @columns, @columns_hash, @primary_keys, @data_sources, @indexes, database_version]
      end