Github user tdas commented on a diff in the pull request:
https://github.com/apache/spark/pull/20243#discussion_r161967603
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/sources/ConsoleWriter.scala
---
@@ -0,0 +1,57 @@
+/*
+ * 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.execution.streaming.sources
+
+import org.apache.spark.internal.Logging
+import org.apache.spark.sql.{Row, SparkSession}
+import org.apache.spark.sql.sources.v2.DataSourceV2Options
+import org.apache.spark.sql.sources.v2.writer.{DataSourceV2Writer,
DataWriterFactory, WriterCommitMessage}
+import org.apache.spark.sql.types.StructType
+
+class ConsoleWriter(batchId: Long, schema: StructType, options:
DataSourceV2Options)
+ extends DataSourceV2Writer with Logging {
+ // Number of rows to display, by default 20 rows
+ private val numRowsToShow = options.getInt("numRows", 20)
+
+ // Truncate the displayed data if it is too long, by default it is true
+ private val isTruncated = options.getBoolean("truncate", true)
+
+ assert(SparkSession.getActiveSession.isDefined)
+ private val spark = SparkSession.getActiveSession.get
+
+ override def createWriterFactory(): DataWriterFactory[Row] =
PackedRowWriterFactory
+
+ override def commit(messages: Array[WriterCommitMessage]): Unit =
synchronized {
+ val batch = messages.collect {
+ case PackedRowCommitMessage(rows) => rows
+ }.fold(Array())(_ ++ _)
--- End diff --
Why this complicated fold? Just `array.collect { ... }` returns an Array ..
isnt it?
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