Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/20285#discussion_r163336725
--- Diff:
examples/src/main/java/org/apache/spark/examples/ml/JavaVectorSizeHintExample.java
---
@@ -0,0 +1,78 @@
+/*
+ * 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.examples.ml;
+
+import org.apache.spark.sql.SparkSession;
+
+// $example on$
+import java.util.Arrays;
+
+import org.apache.spark.ml.feature.VectorAssembler;
+import org.apache.spark.ml.feature.VectorSizeHint;
+import org.apache.spark.ml.linalg.VectorUDT;
+import org.apache.spark.ml.linalg.Vectors;
+import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Row;
+import org.apache.spark.sql.RowFactory;
+import org.apache.spark.sql.types.StructField;
+import org.apache.spark.sql.types.StructType;
+import static org.apache.spark.sql.types.DataTypes.*;
+// $example off$
+
+public class JavaVectorSizeHintExample {
+ public static void main(String[] args) {
+ SparkSession spark = SparkSession
+ .builder()
+ .appName("JavaVectorSizeHintExample")
+ .getOrCreate();
+
+ // $example on$
+ StructType schema = createStructType(new StructField[]{
+ createStructField("id", IntegerType, false),
+ createStructField("hour", IntegerType, false),
+ createStructField("mobile", DoubleType, false),
+ createStructField("userFeatures", new VectorUDT(), false),
+ createStructField("clicked", DoubleType, false)
+ });
+ Row row = RowFactory.create(0, 18, 1.0, Vectors.dense(0.0, 10.0, 0.5),
1.0);
--- End diff --
Hi, @MrBago . It seems that we need to add one more row here.
```java
RowFactory.create(0, 18, 1.0, Vectors.dense(0.0, 10.0), 0.0);
```
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