| /* |
| * 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.datasketches.hive.quantiles; |
| |
| import java.util.Comparator; |
| |
| import org.apache.datasketches.ArrayOfItemsSerDe; |
| import org.apache.datasketches.hive.common.BytesWritableHelper; |
| import org.apache.datasketches.memory.Memory; |
| import org.apache.datasketches.quantiles.ItemsSketch; |
| import org.apache.hadoop.hive.ql.metadata.HiveException; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator; |
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector.PrimitiveCategory; |
| import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory; |
| import org.apache.hadoop.io.BytesWritable; |
| |
| abstract class ItemsEvaluator<T> extends GenericUDAFEvaluator { |
| |
| private final Comparator<? super T> comparator_; |
| private final ArrayOfItemsSerDe<T> serDe_; |
| protected PrimitiveObjectInspector inputObjectInspector; |
| protected PrimitiveObjectInspector kObjectInspector; |
| |
| ItemsEvaluator(final Comparator<? super T> comparator, final ArrayOfItemsSerDe<T> serDe) { |
| comparator_ = comparator; |
| serDe_ = serDe; |
| } |
| |
| @Override |
| public ObjectInspector init(final Mode mode, final ObjectInspector[] parameters) throws HiveException { |
| super.init(mode, parameters); |
| inputObjectInspector = (PrimitiveObjectInspector) parameters[0]; |
| |
| // Parameters: |
| // In PARTIAL1 and COMPLETE mode, the parameters are original data. |
| // In PARTIAL2 and FINAL mode, the parameters are partial aggregations. |
| if (mode == Mode.PARTIAL1 || mode == Mode.COMPLETE) { |
| if (parameters.length > 1) { |
| kObjectInspector = (PrimitiveObjectInspector) parameters[1]; |
| } |
| } |
| |
| return PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(PrimitiveCategory.BINARY); |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public void reset(final AggregationBuffer buf) throws HiveException { |
| @SuppressWarnings("unchecked") |
| final ItemsUnionState<T> state = (ItemsUnionState<T>) buf; |
| state.reset(); |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public Object terminatePartial(final AggregationBuffer buf) throws HiveException { |
| return terminate(buf); |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public void merge(final AggregationBuffer buf, final Object data) throws HiveException { |
| if (data == null) { return; } |
| @SuppressWarnings("unchecked") |
| final ItemsUnionState<T> state = (ItemsUnionState<T>) buf; |
| final Memory serializedSketch = BytesWritableHelper.wrapAsMemory( |
| (BytesWritable) inputObjectInspector.getPrimitiveWritableObject(data)); |
| state.update(serializedSketch); |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public Object terminate(final AggregationBuffer buf) throws HiveException { |
| @SuppressWarnings("unchecked") |
| final ItemsUnionState<T> state = (ItemsUnionState<T>) buf; |
| final ItemsSketch<T> resultSketch = state.getResult(); |
| if (resultSketch == null) { return null; } |
| return new BytesWritable(resultSketch.toByteArray(serDe_)); |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public AggregationBuffer getNewAggregationBuffer() throws HiveException { |
| return new ItemsUnionState<T>(comparator_, serDe_); |
| } |
| |
| } |