| /* |
| * 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.frequencies; |
| |
| import org.apache.datasketches.ArrayOfItemsSerDe; |
| import org.apache.hadoop.hive.ql.exec.UDFArgumentException; |
| import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException; |
| import org.apache.hadoop.hive.ql.metadata.HiveException; |
| import org.apache.hadoop.hive.ql.parse.SemanticException; |
| import org.apache.hadoop.hive.ql.udf.generic.AbstractGenericUDAFResolver; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFParameterInfo; |
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils; |
| |
| /** |
| * This is a generic implementation to be specialized in subclasses |
| * @param <T> type of item |
| */ |
| @SuppressWarnings("javadoc") |
| public abstract class DataToItemsSketchUDAF<T> extends AbstractGenericUDAFResolver { |
| |
| @Override |
| public GenericUDAFEvaluator getEvaluator(final GenericUDAFParameterInfo info) |
| throws SemanticException { |
| final ObjectInspector[] inspectors = info.getParameterObjectInspectors(); |
| if (inspectors.length != 2) { |
| throw new UDFArgumentException("Two arguments expected"); |
| } |
| |
| if (inspectors[0].getCategory() != ObjectInspector.Category.PRIMITIVE) { |
| throw new UDFArgumentTypeException(0, "Primitive argument expected, but " |
| + inspectors[0].getTypeName() + " was recieved"); |
| } |
| |
| if (inspectors[1].getCategory() != ObjectInspector.Category.PRIMITIVE) { |
| throw new UDFArgumentTypeException(0, "Primitive argument expected, but " |
| + inspectors[1].getTypeName() + " was recieved"); |
| } |
| final PrimitiveObjectInspector inspector2 = (PrimitiveObjectInspector) inspectors[1]; |
| if (inspector2.getPrimitiveCategory() != PrimitiveObjectInspector.PrimitiveCategory.INT) { |
| throw new UDFArgumentTypeException(0, "Integer value expected as the second argument, but " |
| + inspector2.getPrimitiveCategory().name() + " was received"); |
| } |
| |
| return createEvaluator(); |
| } |
| |
| public abstract GenericUDAFEvaluator createEvaluator(); |
| |
| public static abstract class DataToItemsSketchEvaluator<T> extends ItemsEvaluator<T> { |
| |
| private PrimitiveObjectInspector maxMapSizeObjectInspector; |
| |
| public DataToItemsSketchEvaluator(final ArrayOfItemsSerDe<T> serDe) { |
| super(serDe); |
| } |
| |
| @Override |
| public ObjectInspector init(final Mode mode, final ObjectInspector[] parameters) |
| throws HiveException { |
| final ObjectInspector result = super.init(mode, parameters); |
| |
| // Parameters: |
| // In PARTIAL1 and COMPLETE mode, the parameters are original data. |
| // In PARTIAL2 and FINAL mode, the parameters are just partial aggregations. |
| if ((mode == Mode.PARTIAL1) || (mode == Mode.COMPLETE)) { |
| if (parameters.length > 1) { |
| this.maxMapSizeObjectInspector = (PrimitiveObjectInspector) parameters[1]; |
| } |
| } |
| |
| return result; |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public void iterate(final AggregationBuffer buf, final Object[] data) throws HiveException { |
| if (data[0] == null) { return; } |
| @SuppressWarnings("unchecked") |
| final ItemsState<T> state = (ItemsState<T>) buf; |
| if (!state.isInitialized()) { |
| final int maxMapSize = PrimitiveObjectInspectorUtils.getInt(data[1], this.maxMapSizeObjectInspector); |
| state.init(maxMapSize); |
| } |
| state.update(extractValue(data[0], this.inputObjectInspector)); |
| } |
| |
| public abstract T extractValue(final Object data, final ObjectInspector objectInspector) |
| throws HiveException; |
| |
| } |
| |
| } |