Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/929#discussion_r55475892
--- Diff:
tajo-plan/src/main/java/org/apache/tajo/plan/function/HiveFunctionInvoke.java
---
@@ -0,0 +1,113 @@
+/**
+ * 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.tajo.plan.function;
+
+import org.apache.hadoop.io.*;
+import org.apache.tajo.catalog.FunctionDesc;
+import org.apache.tajo.common.TajoDataTypes;
+import org.apache.tajo.datum.Datum;
+import org.apache.tajo.exception.TajoInternalError;
+import org.apache.tajo.exception.TajoRuntimeException;
+import org.apache.tajo.function.UDFInvocationDesc;
+import org.apache.tajo.storage.Tuple;
+import org.apache.tajo.util.WritableTypeConverter;
+
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.net.URL;
+import java.net.URLClassLoader;
+
+public class HiveFunctionInvoke extends FunctionInvoke implements
Cloneable {
+ private Object instance = null;
+ private Method evalMethod = null;
+ private Writable [] params;
+
+ public HiveFunctionInvoke(FunctionDesc desc) {
+ super(desc);
+ params = new Writable[desc.getParamTypes().length];
+ }
+
+ @Override
+ public void init(FunctionInvokeContext context) throws IOException {
+ UDFInvocationDesc udfDesc = functionDesc.getInvocation().getUDF();
+
+ URL [] urls = new URL [] { new URL(udfDesc.getPath()) };
+ URLClassLoader loader = new URLClassLoader(urls);
+
+ try {
+ Class<?> udfclass = loader.loadClass(udfDesc.getName());
+ evalMethod = getEvaluateMethod(functionDesc.getParamTypes(),
udfclass);
+ } catch (ClassNotFoundException e) {
+ throw new TajoInternalError(e);
+ }
+ }
+
+ private Method getEvaluateMethod(TajoDataTypes.DataType [] paramTypes,
Class<?> clazz) {
+ Constructor constructor = clazz.getConstructors()[0];
+
+ try {
+ instance = constructor.newInstance();
+ } catch
(InstantiationException|IllegalAccessException|InvocationTargetException e) {
+ throw new TajoInternalError(e);
+ }
+
+ for (Method m: clazz.getMethods()) {
+ if (m.getName().equals("evaluate")) {
--- End diff --
Class.getMethod(String name, Class<?>... parameterTypes) can simplify this
for loop.
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