| /* |
| * 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.pig.builtin; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import org.apache.hadoop.hive.ql.exec.UDF; |
| import org.apache.hadoop.hive.ql.metadata.HiveException; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDF; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredJavaObject; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredObject; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDFBridge; |
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector; |
| import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo; |
| import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils; |
| import org.apache.pig.ResourceSchema; |
| import org.apache.pig.ResourceSchema.ResourceFieldSchema; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.logicalLayer.schema.Schema; |
| import org.apache.pig.impl.util.hive.HiveUtils; |
| |
| /** |
| * Use Hive UDF or GenericUDF. |
| * Example: |
| * define sin HiveUDF('sin'); |
| * A = load 'mydata' as (num:double); |
| * B = foreach A generate sin(num); |
| * HiveUDF takes an optional second parameter if the Hive UDF require constant parameters |
| * define in_file HiveUDF('in_file', '(null, "names.txt")'); |
| */ |
| public class HiveUDF extends HiveUDFBase { |
| |
| private boolean inited = false; |
| private GenericUDF evalUDF; |
| |
| static class SchemaInfo { |
| private StructObjectInspector inputObjectInspector; |
| private ObjectInspector outputObjectInspector; |
| |
| private void init(Schema inputSchema, GenericUDF evalUDF, ConstantObjectInspectInfo constantsInfo) throws IOException { |
| ResourceSchema rs = new ResourceSchema(inputSchema); |
| ResourceFieldSchema wrappedTupleFieldSchema = new ResourceFieldSchema(); |
| wrappedTupleFieldSchema.setType(DataType.TUPLE); |
| wrappedTupleFieldSchema.setSchema(rs); |
| |
| TypeInfo ti = HiveUtils.getTypeInfo(wrappedTupleFieldSchema); |
| inputObjectInspector = (StructObjectInspector)HiveUtils.createObjectInspector(ti); |
| |
| try { |
| ObjectInspector[] arguments = new ObjectInspector[inputSchema.size()]; |
| for (int i=0;i<inputSchema.size();i++) { |
| if (constantsInfo!=null && !constantsInfo.isEmpty() && constantsInfo.get(i)!=null) { |
| arguments[i] = constantsInfo.get(i); |
| } else { |
| arguments[i] = inputObjectInspector.getAllStructFieldRefs().get(i).getFieldObjectInspector(); |
| } |
| } |
| outputObjectInspector = evalUDF.initialize(arguments); |
| } catch (Exception e) { |
| throw new IOException(e); |
| } |
| } |
| } |
| |
| SchemaInfo schemaInfo = new SchemaInfo(); |
| |
| ConstantObjectInspectInfo constantsInfo; |
| |
| public HiveUDF(String funcName) throws IOException, InstantiationException, IllegalAccessException { |
| Class hiveUDFClass = resolveFunc(funcName); |
| if (UDF.class.isAssignableFrom(hiveUDFClass)) { |
| evalUDF = new GenericUDFBridge(funcName, false, hiveUDFClass.getName()); |
| } else if (GenericUDF.class.isAssignableFrom(hiveUDFClass)){ |
| evalUDF = (GenericUDF)hiveUDFClass.newInstance(); |
| } else { |
| throw new IOException(getErrorMessage(hiveUDFClass)); |
| } |
| } |
| |
| public HiveUDF(String funcName, String params) throws IOException, InstantiationException, IllegalAccessException { |
| this(funcName); |
| constantsInfo = ConstantObjectInspectInfo.parse(params); |
| } |
| |
| @Override |
| public Object exec(Tuple input) throws IOException { |
| if (!inited) { |
| evalUDF.configure(instantiateMapredContext()); |
| schemaInfo.init(getInputSchema(), evalUDF, constantsInfo); |
| inited = true; |
| } |
| List inputs = schemaInfo.inputObjectInspector.getStructFieldsDataAsList(input); |
| DeferredObject[] arguments = new DeferredObject[inputs.size()]; |
| for (int i=0 ; i<inputs.size() ; i++) { |
| arguments[i] = new DeferredJavaObject(inputs.get(i)); |
| } |
| try { |
| Object returnValue = evalUDF.evaluate(arguments); |
| return HiveUtils.convertHiveToPig(returnValue, schemaInfo.outputObjectInspector, null); |
| } catch (HiveException e) { |
| throw new IOException(e); |
| } |
| } |
| |
| @Override |
| public List<String> getShipFiles() { |
| try { |
| if (!inited) { |
| schemaInfo.init(getInputSchema(), evalUDF, constantsInfo); |
| inited = true; |
| } |
| } catch(Exception e) { |
| throw new RuntimeException(e); |
| } |
| List<String> files = super.getShipFiles(); |
| if (evalUDF.getRequiredFiles() != null) { |
| files.addAll(Arrays.asList(evalUDF.getRequiredFiles())); |
| } |
| if (evalUDF.getRequiredJars() != null) { |
| files.addAll(Arrays.asList(evalUDF.getRequiredJars())); |
| } |
| |
| return files; |
| } |
| |
| @Override |
| public Schema outputSchema(Schema input) { |
| try { |
| if (!inited) { |
| schemaInfo.init(getInputSchema(), evalUDF, constantsInfo); |
| inited = true; |
| } |
| ResourceFieldSchema rfs = HiveUtils.getResourceFieldSchema( |
| TypeInfoUtils.getTypeInfoFromObjectInspector(schemaInfo.outputObjectInspector)); |
| ResourceSchema outputSchema = new ResourceSchema(); |
| outputSchema.setFields(new ResourceFieldSchema[] {rfs}); |
| return Schema.getPigSchema(outputSchema); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Override |
| public void finish() { |
| try { |
| evalUDF.close(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |