/**
* 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;
import org.apache.hadoop.hive.common.type.HiveDecimal;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.serde2.io.ByteWritable;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
import org.apache.hadoop.hive.serde2.io.ShortWritable;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
/**
* class for computing positive modulo. Used for positive_mod command in Cli See
* {org.apache.hadoop.hive.ql.udf.UDFOPMod} See
* {org.apache.hadoop.hive.ql.exec.FunctionRegistry}
*/
@Description(name = "pmod", value = "a _FUNC_ b - Compute the positive modulo")
public class UDFPosMod extends UDFBaseNumericOp {
public UDFPosMod() {
}
@Override
public ByteWritable evaluate(ByteWritable a, ByteWritable b) {
// LOG.info("Get input " + a.getClass() + ":" + a + " " + b.getClass() + ":"
// + b);
if ((a == null) || (b == null)) {
return null;
}
byteWritable.set((byte) (((a.get() % b.get()) + b.get()) % b.get()));
return byteWritable;
}
@Override
public ShortWritable evaluate(ShortWritable a, ShortWritable b) {
// LOG.info("Get input " + a.getClass() + ":" + a + " " + b.getClass() + ":"
// + b);
if ((a == null) || (b == null)) {
return null;
}
shortWritable.set((short) (((a.get() % b.get()) + b.get()) % b.get()));
return shortWritable;
}
@Override
public IntWritable evaluate(IntWritable a, IntWritable b) {
// LOG.info("Get input " + a.getClass() + ":" + a + " " + b.getClass() + ":"
// + b);
if ((a == null) || (b == null)) {
return null;
}
intWritable.set((((a.get() % b.get()) + b.get()) % b.get()));
return intWritable;
}
@Override
public LongWritable evaluate(LongWritable a, LongWritable b) {
// LOG.info("Get input " + a.getClass() + ":" + a + " " + b.getClass() + ":"
// + b);
if ((a == null) || (b == null)) {
return null;
}
longWritable.set(((a.get() % b.get()) + b.get()) % b.get());
return longWritable;
}
@Override
public FloatWritable evaluate(FloatWritable a, FloatWritable b) {
// LOG.info("Get input " + a.getClass() + ":" + a + " " + b.getClass() + ":"
// + b);
if ((a == null) || (b == null)) {
return null;
}
floatWritable.set(((a.get() % b.get()) + b.get()) % b.get());
return floatWritable;
}
@Override
public DoubleWritable evaluate(DoubleWritable a, DoubleWritable b) {
// LOG.info("Get input " + a.getClass() + ":" + a + " " + b.getClass() + ":"
// + b);
if ((a == null) || (b == null)) {
return null;
}
doubleWritable.set(((a.get() % b.get()) + b.get()) % b.get());
return doubleWritable;
}
@Override
public HiveDecimalWritable evaluate(HiveDecimalWritable a, HiveDecimalWritable b) {
if ((a == null) || (b == null)) {
return null;
}
HiveDecimal av = a.getHiveDecimal();
HiveDecimal bv = b.getHiveDecimal();
if (bv.compareTo(HiveDecimal.ZERO) == 0) {
return null;
}
try {
decimalWritable.set(av.remainder(bv).add(bv).remainder(bv));
} catch (NumberFormatException e) {
return null;
}
return decimalWritable;
}
}