org.apache.hadoop.hive.ql.udf.UDFCeil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of hive-exec Show documentation

Hive is a data warehouse infrastructure built on top of Hadoop see http://wiki.apache.org/hadoop/Hive

There is a newer version: 0.11.0-shark-0.9.1

/**
 * 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.ql.exec.UDF;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
import org.apache.hadoop.io.LongWritable;

/**
 * UDFCeil.
 *
 */
@Description(name = "ceil,ceiling",
    value = "_FUNC_(x) - Find the smallest integer not smaller than x",
    extended = "Example:\n"
    + "  > SELECT _FUNC_(-0.1) FROM src LIMIT 1;\n"
    + "  0\n"
    + "  > SELECT _FUNC_(5) FROM src LIMIT 1;\n" + "  5")
public class UDFCeil extends UDF {
  private final LongWritable longWritable = new LongWritable();
  private final HiveDecimalWritable decimalWritable = new HiveDecimalWritable();

  public UDFCeil() {
  }

  public LongWritable evaluate(DoubleWritable i) {
    if (i == null) {
      return null;
    } else {
      longWritable.set((long) Math.ceil(i.get()));
      return longWritable;
    }
  }

  public HiveDecimalWritable evaluate(HiveDecimalWritable i) {
    if (i == null) {
      return null;
    } else {
      HiveDecimal bd = i.getHiveDecimal();
      int origScale = bd.scale();
      decimalWritable.set(bd.setScale(0, HiveDecimal.ROUND_CEILING).setScale(origScale));
      return decimalWritable;
    }
  }
}