columns

# File activerecord/lib/active_record/connection_adapters/schema_cache.rb, line 340
      def columns(connection, table_name)
        if ignored_table?(table_name)
          raise ActiveRecord::StatementInvalid, "Table '#{table_name}' doesn't exist"
        end

        @columns.fetch(table_name) do
          @columns[deep_deduplicate(table_name)] = deep_deduplicate(connection.columns(table_name))
        end
      end