/* * 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.ArrayOfStringsSerDe; import org.apache.hadoop.hive.common.type.HiveChar; import org.apache.hadoop.hive.common.type.HiveVarchar; import org.apache.hadoop.hive.ql.exec.Description; import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException; 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; @Description(name = "DataToSketch", value = "_FUNC_(value, k) - " + "Returns an ItemsSketch<String> in a serialized form as a binary blob." + " Values must be of string type." + " Parameter k controls the accuracy and the size of the sketch." + " If k is ommitted, the default is used.") @SuppressWarnings("javadoc") public class DataToStringsSketchUDAF extends DataToItemsSketchUDAF<String> { @Override public GenericUDAFEvaluator createEvaluator() { return new DataToStringsSketchEvaluator(); } static class DataToStringsSketchEvaluator extends DataToSketchEvaluator<String> { DataToStringsSketchEvaluator() { super(Comparator.naturalOrder(), new ArrayOfStringsSerDe()); } @Override public String extractValue(final Object data, final ObjectInspector objectInspector) throws HiveException { final Object value = inputObjectInspector.getPrimitiveJavaObject(data); if (value instanceof String) { return (String) value; } else if (value instanceof HiveChar) { return ((HiveChar) value).getValue(); } else if (value instanceof HiveVarchar) { return ((HiveVarchar) value).getValue(); } else { throw new UDFArgumentTypeException(0, "unsupported type " + value.getClass().getName()); } } } }