leiyiz commented on a change in pull request #12580:
URL: https://github.com/apache/beam/pull/12580#discussion_r470758203



##########
File path: 
sdks/python/apache_beam/testing/benchmarks/nexmark/models/bids_per_session.py
##########
@@ -0,0 +1,56 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+"""Result of Query11 and 12."""
+from __future__ import absolute_import
+
+from apache_beam.coders import coder_impl
+from apache_beam.coders.coders import FastCoder
+from apache_beam.testing.benchmarks.nexmark import nexmark_util
+
+
+class BidsPerSessionCoder(FastCoder):

Review comment:
       I think there will be further transforms, at least there is going to be 
metrics transform after the query is done to collect data and re-stamping the 
elements for streaming purposes i suppose




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