[GitHub] [calcite] asereda-gs commented on a change in pull request #1127: [CALCITE-2913] Adapter for Apache Kafka

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asereda-gs commented on a change in pull request #1127: [CALCITE-2913] Adapter for Apache Kafka
URL: https://github.com/apache/calcite/pull/1127#discussion_r286996689
 
 

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 File path: kafka/src/main/java/org/apache/calcite/adapter/kafka/KafkaRowConverter.java
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 @@ -0,0 +1,51 @@
+/*
+ * 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.
+ */
+package org.apache.calcite.adapter.kafka;
+
+import org.apache.calcite.rel.type.RelDataType;
+
+import org.apache.kafka.clients.consumer.ConsumerConfig;
+import org.apache.kafka.clients.consumer.ConsumerRecord;
+
+/**
+ * Interface to handle formatting between Kafka message and Calcite row.
+ *
+ * @param <K>: type for Kafka message key,
+ *           refer to {@link ConsumerConfig#KEY_DESERIALIZER_CLASS_CONFIG};
+ * @param <V>: type for Kafka message value,
+ *           refer to {@link ConsumerConfig#VALUE_DESERIALIZER_CLASS_CONFIG};
+ *
+ */
+public interface KafkaRowConverter<K, V> {
+
+  /**
+   * Generate row type for a given Kafka topic.
+   *
+   * @param topicName, Kafka topic name;
+   * @return row type
+   */
+  RelDataType rowDataType(String topicName);
 
 Review comment:
   OK if  [CALCITE-3080](https://issues.apache.org/jira/browse/CALCITE-3080) addresses it separately. 

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