Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/17043#discussion_r103049353
--- Diff:
external/kafka-0-10-sql/src/main/scala/org/apache/spark/sql/kafka010/KafkaWriteTask.scala
---
@@ -0,0 +1,119 @@
+/*
+ * 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.spark.sql.kafka010
+
+import java.{util => ju}
+
+import org.apache.kafka.clients.producer._
+import org.apache.kafka.common.serialization.ByteArraySerializer
+
+import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.{Attribute, Cast,
Literal, UnsafeProjection}
+import org.apache.spark.sql.types.{BinaryType, StringType}
+import org.apache.spark.unsafe.types.UTF8String
+
+/**
+ * A simple trait for writing out data in a single Spark task, without any
concerns about how
+ * to commit or abort tasks. Exceptions thrown by the implementation of
this class will
+ * automatically trigger task aborts.
+ */
+private[kafka010] class KafkaWriteTask(
+ producerConfiguration: ju.Map[String, Object],
+ inputSchema: Seq[Attribute],
+ topic: Option[String]) {
+ // used to synchronize with Kafka callbacks
+ @volatile var failedWrite: Exception = null
+ val topicExpression =
+ if (topic.isDefined) {
--- End diff --
how about this:
```Scala
val topicExpression = topic.map(Literal(_)).orElse {
inputSchema.find(_.name == KafkaWriter.TOPIC_ATTRIBUTE_NAME)
}.getOrElse {
throw new IllegalStateException(s"topic option required when no " +
s"'${KafkaWriter.TOPIC_ATTRIBUTE_NAME}' attribute is present")
}
```
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