Test for the issue #12615

tests/integration/test_storage_kafka/clickhouse_path/format_schemas/social.proto

@@ -0,0 +1,6 @@
+syntax = "proto3";
+
+message User {
+  string username = 1;
+  int32 timestamp = 2;
+}

tests/integration/test_storage_kafka/social_pb2.py

@@ -0,0 +1,75 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: social.proto
+
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+
+
+DESCRIPTOR = _descriptor.FileDescriptor(
+  name='social.proto',
+  package='',
+  syntax='proto3',
+  serialized_options=None,
+  serialized_pb=b'\n\x0csocial.proto\"+\n\x04User\x12\x10\n\x08username\x18\x01 \x01(\t\x12\x11\n\ttimestamp\x18\x02 \x01(\x05\x62\x06proto3'
+)
+
+
+
+
+_USER = _descriptor.Descriptor(
+  name='User',
+  full_name='User',
+  filename=None,
+  file=DESCRIPTOR,
+  containing_type=None,
+  fields=[
+    _descriptor.FieldDescriptor(
+      name='username', full_name='User.username', index=0,
+      number=1, type=9, cpp_type=9, label=1,
+      has_default_value=False, default_value=b"".decode('utf-8'),
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+    _descriptor.FieldDescriptor(
+      name='timestamp', full_name='User.timestamp', index=1,
+      number=2, type=5, cpp_type=1, label=1,
+      has_default_value=False, default_value=0,
+      message_type=None, enum_type=None, containing_type=None,
+      is_extension=False, extension_scope=None,
+      serialized_options=None, file=DESCRIPTOR),
+  ],
+  extensions=[
+  ],
+  nested_types=[],
+  enum_types=[
+  ],
+  serialized_options=None,
+  is_extendable=False,
+  syntax='proto3',
+  extension_ranges=[],
+  oneofs=[
+  ],
+  serialized_start=16,
+  serialized_end=59,
+)
+
+DESCRIPTOR.message_types_by_name['User'] = _USER
+_sym_db.RegisterFileDescriptor(DESCRIPTOR)
+
+User = _reflection.GeneratedProtocolMessageType('User', (_message.Message,), {
+  'DESCRIPTOR' : _USER,
+  '__module__' : 'social_pb2'
+  # @@protoc_insertion_point(class_scope:User)
+  })
+_sym_db.RegisterMessage(User)
+
+
+# @@protoc_insertion_point(module_scope)

tests/integration/test_storage_kafka/test.py

@@ -30,6 +30,8 @@ libprotoc 3.0.0
 protoc --python_out=. kafka.proto
 """
 from . import kafka_pb2
+from . import social_pb2
+
 
 # TODO: add test for run-time offset update in CH, if we manually update it on Kafka side.
 # TODO: add test for SELECT LIMIT is working.
@@ -115,6 +117,20 @@ def kafka_produce_protobuf_messages_no_delimeters(topic, start_index, num_messag
     producer.flush()
     print("Produced {} messages for topic {}".format(num_messages, topic))
 
+def kafka_produce_protobuf_social(topic, start_index, num_messages):
+    data = b''
+    for i in range(start_index, start_index + num_messages):
+        msg = social_pb2.User()
+        msg.username='John Doe {}'.format(i)
+        msg.timestamp=1000000+i
+        serialized_msg = msg.SerializeToString()
+        data = data + _VarintBytes(len(serialized_msg)) + serialized_msg
+    producer = KafkaProducer(bootstrap_servers="localhost:9092", value_serializer=producer_serializer)
+    producer.send(topic=topic, value=data)
+    producer.flush()
+    print(("Produced {} messages for topic {}".format(num_messages, topic)))
+
+
 def avro_confluent_message(schema_registry_client, value):
     # type: (CachedSchemaRegistryClient, dict) -> str
 
@@ -982,6 +998,84 @@ def test_kafka_protobuf(kafka_cluster):
     kafka_check_result(result, True)
 
 
+@pytest.mark.timeout(180)
+def test_kafka_string_field_on_first_position_in_protobuf(kafka_cluster):
+# https://github.com/ClickHouse/ClickHouse/issues/12615
+
+    instance.query('''
+CREATE TABLE test.kafka (
+    username String,
+    timestamp Int32
+  ) ENGINE = Kafka()
+SETTINGS
+    kafka_broker_list = 'kafka1:19092',
+    kafka_topic_list = 'string_field_on_first_position_in_protobuf',
+    kafka_group_name = 'string_field_on_first_position_in_protobuf',
+    kafka_format = 'Protobuf',
+    kafka_schema = 'social:User';
+
+    SELECT * FROM test.kafka;
+        ''')
+
+    kafka_produce_protobuf_social('string_field_on_first_position_in_protobuf', 0, 20)
+    kafka_produce_protobuf_social('string_field_on_first_position_in_protobuf', 20, 1)
+    kafka_produce_protobuf_social('string_field_on_first_position_in_protobuf', 21, 29)
+
+    result = instance.query('SELECT * FROM test.kafka', ignore_error=True)
+    expected = '''\
+John Doe 0	1000000
+John Doe 1	1000001
+John Doe 2	1000002
+John Doe 3	1000003
+John Doe 4	1000004
+John Doe 5	1000005
+John Doe 6	1000006
+John Doe 7	1000007
+John Doe 8	1000008
+John Doe 9	1000009
+John Doe 10	1000010
+John Doe 11	1000011
+John Doe 12	1000012
+John Doe 13	1000013
+John Doe 14	1000014
+John Doe 15	1000015
+John Doe 16	1000016
+John Doe 17	1000017
+John Doe 18	1000018
+John Doe 19	1000019
+John Doe 20	1000020
+John Doe 21	1000021
+John Doe 22	1000022
+John Doe 23	1000023
+John Doe 24	1000024
+John Doe 25	1000025
+John Doe 26	1000026
+John Doe 27	1000027
+John Doe 28	1000028
+John Doe 29	1000029
+John Doe 30	1000030
+John Doe 31	1000031
+John Doe 32	1000032
+John Doe 33	1000033
+John Doe 34	1000034
+John Doe 35	1000035
+John Doe 36	1000036
+John Doe 37	1000037
+John Doe 38	1000038
+John Doe 39	1000039
+John Doe 40	1000040
+John Doe 41	1000041
+John Doe 42	1000042
+John Doe 43	1000043
+John Doe 44	1000044
+John Doe 45	1000045
+John Doe 46	1000046
+John Doe 47	1000047
+John Doe 48	1000048
+John Doe 49	1000049
+'''
+    assert TSV(result) == TSV(expected)
+
 @pytest.mark.timeout(30)
 def test_kafka_protobuf_no_delimiter(kafka_cluster):
     instance.query('''