/**
* 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.hadoop.hive.common.type.HiveDecimal;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedExpressions;
import org.apache.hadoop.hive.ql.exec.vector.expressions.BRoundWithNumDigitsDoubleToDouble;
import org.apache.hadoop.hive.ql.exec.vector.expressions.FuncBRoundWithNumDigitsDecimalToDecimal;
import org.apache.hadoop.hive.ql.exec.vector.expressions.gen.FuncBRoundDecimalToDecimal;
import org.apache.hadoop.hive.ql.exec.vector.expressions.gen.FuncBRoundDoubleToDouble;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
@Description(name = "bround",
value = "_FUNC_(x[, d]) - round x to d decimal places using HALF_EVEN rounding mode.",
extended = "Banker's rounding. The value is rounded to the nearest even number. Also known as Gaussian rounding.\n"
+ "Example:\n"
+ " > SELECT _FUNC_(12.25, 1);\n 12.2")
@VectorizedExpressions({ FuncBRoundDoubleToDouble.class, BRoundWithNumDigitsDoubleToDouble.class,
FuncBRoundWithNumDigitsDecimalToDecimal.class, FuncBRoundDecimalToDecimal.class })
public class GenericUDFBRound extends GenericUDFRound {
@Override
protected HiveDecimalWritable round(HiveDecimalWritable inputDecWritable, int scale) {
HiveDecimalWritable result = new HiveDecimalWritable(inputDecWritable);
result.mutateSetScale(scale, HiveDecimal.ROUND_HALF_EVEN);
return result;
}
@Override
protected long round(long input, int scale) {
return RoundUtils.bround(input, scale);
}
@Override
protected double round(double input, int scale) {
return RoundUtils.bround(input, scale);
}
@Override
protected DoubleWritable round(DoubleWritable input, int scale) {
double d = input.get();
if (Double.isNaN(d) || Double.isInfinite(d)) {
return new DoubleWritable(d);
} else {
return new DoubleWritable(RoundUtils.bround(d, scale));
}
}
@Override
public String getDisplayString(String[] children) {
return getStandardDisplayString("bround", children);
}
}