/* * 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.hadoop.hive.ql.exec.UDFArgumentException; 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.PrimitiveCategory; 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 != 1) && (inspectors.length != 2)) { throw new UDFArgumentException("One or two arguments expected"); } ObjectInspectorValidator.validateCategoryPrimitive(inspectors[0], 0); if (inspectors.length == 2) { ObjectInspectorValidator.validateGivenPrimitiveCategory(inspectors[1], 1, PrimitiveCategory.INT); } return createEvaluator(); } public abstract GenericUDAFEvaluator createEvaluator(); public static abstract class DataToSketchEvaluator<T> extends ItemsEvaluator<T> { DataToSketchEvaluator(final Comparator<? super T> comparator, final ArrayOfItemsSerDe<T> serDe) { super(comparator, serDe); } @SuppressWarnings("deprecation") @Override public void iterate(final AggregationBuffer buf, final Object[] data) throws HiveException { if (data[0] == null) { return; } @SuppressWarnings("unchecked") final ItemsUnionState<T> state = (ItemsUnionState<T>) buf; if (!state.isInitialized() && (kObjectInspector != null)) { final int k = PrimitiveObjectInspectorUtils.getInt(data[1], kObjectInspector); state.init(k); } state.update(extractValue(data[0], inputObjectInspector)); } public abstract T extractValue(final Object data, final ObjectInspector objectInspector) throws HiveException; } }