Github user yhuai commented on a diff in the pull request:
https://github.com/apache/spark/pull/7458#discussion_r34870080
--- Diff:
sql/hive/src/test/java/test/org/apache/spark/sql/hive/aggregate2/MyJavaUDAF.java
---
@@ -0,0 +1,100 @@
+/*
+ * 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 test.org.apache.spark.sql.hive.aggregate2;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import
org.apache.spark.sql.catalyst.expressions.aggregate2.MutableAggregationBuffer;
+import
org.apache.spark.sql.execution.expressions.aggregate2.UserDefinedAggregateFunction;
+import org.apache.spark.sql.types.StructField;
+import org.apache.spark.sql.types.StructType;
+import org.apache.spark.sql.types.DataType;
+import org.apache.spark.sql.types.DataTypes;
+import org.apache.spark.sql.Row;
+
+public class MyJavaUDAF extends UserDefinedAggregateFunction {
+
+ private StructType _inputDataType;
+
+ private StructType _bufferSchema;
+
+ private DataType _returnDataType;
+
+ public MyJavaUDAF() {
+ List<StructField> inputfields = new ArrayList<StructField>();
+ inputfields.add(DataTypes.createStructField("inputDouble",
DataTypes.DoubleType, true));
+ _inputDataType = DataTypes.createStructType(inputfields);
+
+ List<StructField> bufferFields = new ArrayList<StructField>();
+ bufferFields.add(DataTypes.createStructField("bufferDouble",
DataTypes.DoubleType, true));
+ _bufferSchema = DataTypes.createStructType(bufferFields);
+
+ _returnDataType = DataTypes.DoubleType;
+ }
+
+ @Override public StructType inputDataType() {
+ return _inputDataType;
+ }
+
+ @Override public StructType bufferSchema() {
+ return _bufferSchema;
+ }
+
+ @Override public DataType returnDataType() {
+ return _returnDataType;
+ }
+
+ @Override public boolean deterministic() {
+ return true;
+ }
+
+ @Override public void initialize(MutableAggregationBuffer buffer) {
+ buffer.update(0, null);
+ }
+
+ @Override public void update(MutableAggregationBuffer buffer, Row input)
{
+ if (!input.isNullAt(0)) {
+ if (buffer.isNullAt(0)) {
+ buffer.update(0, input.getDouble(0));
+ } else {
+ Double newValue = input.getDouble(0) * buffer.getDouble(0);
+ buffer.update(0, newValue);
+ }
+ }
+ }
+
+ @Override public void merge(MutableAggregationBuffer buffer1, Row
buffer2) {
+ if (!buffer2.isNullAt(0)) {
+ if (buffer1.isNullAt(0)) {
+ buffer1.update(0, buffer2.getDouble(0));
+ } else {
+ Double newValue = buffer2.getDouble(0) * buffer1.getDouble(0);
+ buffer1.update(0, newValue);
+ }
+ }
+ }
+
+ @Override public Object evaluate(Row buffer) {
+ if (buffer.isNullAt(0)) {
+ return null;
+ } else {
+ return buffer.getDouble(0);
+ }
+ }
+}
--- End diff --
@marmbrus @rxin @davies This is an example UDAF in JAVA.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
