| /* |
| * 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.flink.table.hive.functions; |
| |
| import org.apache.flink.table.api.functions.FunctionContext; |
| import org.apache.flink.table.api.functions.ScalarFunction; |
| import org.apache.flink.table.api.types.DataType; |
| |
| import org.apache.hadoop.hive.ql.exec.UDFArgumentException; |
| import org.apache.hadoop.hive.ql.metadata.HiveException; |
| import org.apache.hadoop.hive.ql.udf.UDFType; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDF; |
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * A Flink Scalar Function wrapper which wraps a Hive's GenericUDF. |
| */ |
| public class HiveGenericUDF extends ScalarFunction { |
| |
| private final HiveFunctionWrapper<GenericUDF> hiveFunctionWrapper; |
| |
| private transient GenericUDF function; |
| private transient ObjectInspector returnInspector; |
| private transient GenericUDF.DeferredObject[] deferredObjects; |
| private transient boolean initialized = false; |
| |
| public HiveGenericUDF(HiveFunctionWrapper<GenericUDF> hiveFunctionWrapper) { |
| this.hiveFunctionWrapper = hiveFunctionWrapper; |
| this.initialized = false; |
| } |
| |
| @Override |
| public void open(FunctionContext context) throws Exception { |
| function = hiveFunctionWrapper.createFunction(); |
| initialized = false; |
| } |
| |
| @Override |
| public void close() { |
| // Users may use the instance later. |
| initialized = false; |
| } |
| |
| private void initialize(Object... args) throws UDFArgumentException { |
| ObjectInspector[] argumentInspectors = |
| HiveInspectors.toInspectors(args, hiveFunctionWrapper.getConstants()); |
| returnInspector = function.initializeAndFoldConstants(argumentInspectors); |
| deferredObjects = new GenericUDF.DeferredObject[args.length]; |
| for (int i = 0; i < deferredObjects.length; i++) { |
| deferredObjects[i] = new DeferredObjectAdapter(); |
| } |
| initialized = true; |
| } |
| |
| public Object eval(Object... args) throws HiveException { |
| if (!initialized) { |
| // Initialize at the server side |
| initialize(args); |
| } |
| int i = 0; |
| while (i < args.length) { |
| ((DeferredObjectAdapter) deferredObjects[i]).set(args[i]); |
| i++; |
| } |
| Object obj = function.evaluate(deferredObjects); |
| return HiveInspectors.unwrap(obj, returnInspector); |
| } |
| |
| @Override |
| public DataType getResultType(Object[] arguments, Class[] argTypes) { |
| try { |
| if (null == function) { |
| function = hiveFunctionWrapper.createFunction(); |
| } |
| List<Boolean> contants = new ArrayList<>(); |
| for (Object argument : arguments) { |
| if (argument == null) { |
| contants.add(false); |
| } else { |
| contants.add(true); |
| } |
| } |
| hiveFunctionWrapper.setConstants(contants); |
| // Initialize at the client side |
| initialize(arguments); |
| } catch (UDFArgumentException | IllegalAccessException | ClassNotFoundException | InstantiationException e) { |
| throw new RuntimeException(e); |
| } |
| return HiveInspectors.inspectorToDataType(returnInspector); |
| } |
| |
| @Override |
| public boolean isDeterministic() { |
| try { |
| UDFType udfType = hiveFunctionWrapper.getUDFClass().getAnnotation(UDFType.class); |
| return udfType != null && udfType.deterministic() && !udfType.stateful(); |
| } catch (ClassNotFoundException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |