Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9415#discussion_r44048499
--- Diff:
examples/src/main/scala/org/apache/spark/examples/sql/DatasetWordCount.scala ---
@@ -0,0 +1,42 @@
+/*
+ * 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.
+ */
+
+// scalastyle:off println
+package org.apache.spark.examples.sql
+
+import org.apache.spark.sql.{Dataset, SQLContext}
+import org.apache.spark.{SparkContext, SparkConf}
+
+object DatasetWordCount {
+ def main(args: Array[String]): Unit = {
+ val sparkConf = new SparkConf().setAppName("DatasetWordCount")
+ val sc = new SparkContext(sparkConf)
+ val sqlContext = new SQLContext(sc)
+
+ // Importing the SQL context gives access to all the SQL functions and
implicit conversions.
+ import sqlContext.implicits._
+
+ val lines: Dataset[String] = Seq("hello world", "say hello to the
world").toDS()
+ val words: Dataset[(String, Int)] = lines.flatMap(_.split("
")).map(word => word -> 1)
+ val counts: Dataset[(String, Int)] = words.groupBy(_._1).mapGroups {
+ case (word, iter) => Iterator(word -> iter.length)
--- End diff --
Yeah, agree. I wasn't planning to commit all of these unless they end up
being good examples of the API. I mostly just think it super helpful to see
various ways that people might try to implement common tasks.
Anyway, this will be much easier once #9499 is merged.
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