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/**
* 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.hadoop.hive.ql.udf.generic;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.common.type.HiveDecimal;
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.parse.SemanticException;
import org.apache.hadoop.hive.ql.udf.generic.GenericUDAFEvaluator.Mode;
import org.apache.hadoop.hive.ql.util.JavaDataModel;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorUtils;
import org.apache.hadoop.hive.serde2.typeinfo.DecimalTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.util.StringUtils;
/**
* GenericUDAFSum.
*
*/
@Description(name = "sum", value = "_FUNC_(x) - Returns the sum of a set of numbers")
public class GenericUDAFSum extends AbstractGenericUDAFResolver {
static final Log LOG = LogFactory.getLog(GenericUDAFSum.class.getName());
@Override
public GenericUDAFEvaluator getEvaluator(TypeInfo[] parameters)
throws SemanticException {
if (parameters.length != 1) {
throw new UDFArgumentTypeException(parameters.length - 1,
"Exactly one argument is expected.");
}
if (parameters[0].getCategory() != ObjectInspector.Category.PRIMITIVE) {
throw new UDFArgumentTypeException(0,
"Only primitive type arguments are accepted but "
+ parameters[0].getTypeName() + " is passed.");
}
switch (((PrimitiveTypeInfo) parameters[0]).getPrimitiveCategory()) {
case BYTE:
case SHORT:
case INT:
case LONG:
return new GenericUDAFSumLong();
case TIMESTAMP:
case FLOAT:
case DOUBLE:
case STRING:
case VARCHAR:
case CHAR:
return new GenericUDAFSumDouble();
case DECIMAL:
return new GenericUDAFSumHiveDecimal();
case BOOLEAN:
case DATE:
default:
throw new UDFArgumentTypeException(0,
"Only numeric or string type arguments are accepted but "
+ parameters[0].getTypeName() + " is passed.");
}
}
/**
* GenericUDAFSumHiveDecimal.
*
*/
public static class GenericUDAFSumHiveDecimal extends GenericUDAFEvaluator {
private PrimitiveObjectInspector inputOI;
private HiveDecimalWritable result;
@Override
public ObjectInspector init(Mode m, ObjectInspector[] parameters) throws HiveException {
assert (parameters.length == 1);
super.init(m, parameters);
result = new HiveDecimalWritable(HiveDecimal.ZERO);
inputOI = (PrimitiveObjectInspector) parameters[0];
// The output precision is 10 greater than the input which should cover at least
// 10b rows. The scale is the same as the input.
DecimalTypeInfo outputTypeInfo = null;
if (mode == Mode.PARTIAL1 || mode == Mode.COMPLETE) {
int precision = Math.min(HiveDecimal.MAX_PRECISION, inputOI.precision() + 10);
outputTypeInfo = TypeInfoFactory.getDecimalTypeInfo(precision, inputOI.scale());
} else {
outputTypeInfo = (DecimalTypeInfo) inputOI.getTypeInfo();
}
return PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(outputTypeInfo);
}
/** class for storing decimal sum value. */
@AggregationType(estimable = false) // hard to know exactly for decimals
static class SumHiveDecimalAgg extends AbstractAggregationBuffer {
boolean empty;
HiveDecimal sum;
}
@Override
public AggregationBuffer getNewAggregationBuffer() throws HiveException {
SumHiveDecimalAgg agg = new SumHiveDecimalAgg();
reset(agg);
return agg;
}
@Override
public void reset(AggregationBuffer agg) throws HiveException {
SumHiveDecimalAgg bdAgg = (SumHiveDecimalAgg) agg;
bdAgg.empty = true;
bdAgg.sum = HiveDecimal.ZERO;
}
boolean warned = false;
@Override
public void iterate(AggregationBuffer agg, Object[] parameters) throws HiveException {
assert (parameters.length == 1);
try {
merge(agg, parameters[0]);
} catch (NumberFormatException e) {
if (!warned) {
warned = true;
LOG.warn(getClass().getSimpleName() + " "
+ StringUtils.stringifyException(e));
LOG
.warn(getClass().getSimpleName()
+ " ignoring similar exceptions.");
}
}
}
@Override
public Object terminatePartial(AggregationBuffer agg) throws HiveException {
return terminate(agg);
}
@Override
public void merge(AggregationBuffer agg, Object partial) throws HiveException {
if (partial != null) {
SumHiveDecimalAgg myagg = (SumHiveDecimalAgg) agg;
if (myagg.sum == null) {
return;
}
myagg.empty = false;
myagg.sum = myagg.sum.add(PrimitiveObjectInspectorUtils.getHiveDecimal(partial, inputOI));
}
}
@Override
public Object terminate(AggregationBuffer agg) throws HiveException {
SumHiveDecimalAgg myagg = (SumHiveDecimalAgg) agg;
if (myagg.empty || myagg.sum == null) {
return null;
}
result.set(myagg.sum);
return result;
}
}
/**
* GenericUDAFSumDouble.
*
*/
public static class GenericUDAFSumDouble extends GenericUDAFEvaluator {
private PrimitiveObjectInspector inputOI;
private DoubleWritable result;
@Override
public ObjectInspector init(Mode m, ObjectInspector[] parameters) throws HiveException {
assert (parameters.length == 1);
super.init(m, parameters);
result = new DoubleWritable(0);
inputOI = (PrimitiveObjectInspector) parameters[0];
return PrimitiveObjectInspectorFactory.writableDoubleObjectInspector;
}
/** class for storing double sum value. */
@AggregationType(estimable = true)
static class SumDoubleAgg extends AbstractAggregationBuffer {
boolean empty;
double sum;
@Override
public int estimate() { return JavaDataModel.PRIMITIVES1 + JavaDataModel.PRIMITIVES2; }
}
@Override
public AggregationBuffer getNewAggregationBuffer() throws HiveException {
SumDoubleAgg result = new SumDoubleAgg();
reset(result);
return result;
}
@Override
public void reset(AggregationBuffer agg) throws HiveException {
SumDoubleAgg myagg = (SumDoubleAgg) agg;
myagg.empty = true;
myagg.sum = 0;
}
boolean warned = false;
@Override
public void iterate(AggregationBuffer agg, Object[] parameters) throws HiveException {
assert (parameters.length == 1);
try {
merge(agg, parameters[0]);
} catch (NumberFormatException e) {
if (!warned) {
warned = true;
LOG.warn(getClass().getSimpleName() + " "
+ StringUtils.stringifyException(e));
LOG
.warn(getClass().getSimpleName()
+ " ignoring similar exceptions.");
}
}
}
@Override
public Object terminatePartial(AggregationBuffer agg) throws HiveException {
return terminate(agg);
}
@Override
public void merge(AggregationBuffer agg, Object partial) throws HiveException {
if (partial != null) {
SumDoubleAgg myagg = (SumDoubleAgg) agg;
myagg.empty = false;
myagg.sum += PrimitiveObjectInspectorUtils.getDouble(partial, inputOI);
}
}
@Override
public Object terminate(AggregationBuffer agg) throws HiveException {
SumDoubleAgg myagg = (SumDoubleAgg) agg;
if (myagg.empty) {
return null;
}
result.set(myagg.sum);
return result;
}
}
/**
* GenericUDAFSumLong.
*
*/
public static class GenericUDAFSumLong extends GenericUDAFEvaluator {
private PrimitiveObjectInspector inputOI;
private LongWritable result;
@Override
public ObjectInspector init(Mode m, ObjectInspector[] parameters) throws HiveException {
assert (parameters.length == 1);
super.init(m, parameters);
result = new LongWritable(0);
inputOI = (PrimitiveObjectInspector) parameters[0];
return PrimitiveObjectInspectorFactory.writableLongObjectInspector;
}
/** class for storing double sum value. */
@AggregationType(estimable = true)
static class SumLongAgg extends AbstractAggregationBuffer {
boolean empty;
long sum;
@Override
public int estimate() { return JavaDataModel.PRIMITIVES1 + JavaDataModel.PRIMITIVES2; }
}
@Override
public AggregationBuffer getNewAggregationBuffer() throws HiveException {
SumLongAgg result = new SumLongAgg();
reset(result);
return result;
}
@Override
public void reset(AggregationBuffer agg) throws HiveException {
SumLongAgg myagg = (SumLongAgg) agg;
myagg.empty = true;
myagg.sum = 0;
}
private boolean warned = false;
@Override
public void iterate(AggregationBuffer agg, Object[] parameters) throws HiveException {
assert (parameters.length == 1);
try {
merge(agg, parameters[0]);
} catch (NumberFormatException e) {
if (!warned) {
warned = true;
LOG.warn(getClass().getSimpleName() + " "
+ StringUtils.stringifyException(e));
}
}
}
@Override
public Object terminatePartial(AggregationBuffer agg) throws HiveException {
return terminate(agg);
}
@Override
public void merge(AggregationBuffer agg, Object partial) throws HiveException {
if (partial != null) {
SumLongAgg myagg = (SumLongAgg) agg;
myagg.sum += PrimitiveObjectInspectorUtils.getLong(partial, inputOI);
myagg.empty = false;
}
}
@Override
public Object terminate(AggregationBuffer agg) throws HiveException {
SumLongAgg myagg = (SumLongAgg) agg;
if (myagg.empty) {
return null;
}
result.set(myagg.sum);
return result;
}
}
}