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Apache Hive adaptors for the DataSketches library.
/*
* 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 type of item
*/
@SuppressWarnings("deprecation")
public abstract class DataToItemsSketchUDAF 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 extends ItemsEvaluator {
DataToSketchEvaluator(final Comparator comparator, final ArrayOfItemsSerDe serDe) {
super(comparator, serDe);
}
@Override
public void iterate(final AggregationBuffer buf, final Object[] data) throws HiveException {
if (data[0] == null) { return; }
@SuppressWarnings("unchecked")
final ItemsUnionState state = (ItemsUnionState) buf;
if (!state.isInitialized() && (this.kObjectInspector != null)) {
final int k = PrimitiveObjectInspectorUtils.getInt(data[1], this.kObjectInspector);
state.init(k);
}
state.update(extractValue(data[0], this.inputObjectInspector));
}
public abstract T extractValue(final Object data, final ObjectInspector objectInspector)
throws HiveException;
}
}