org.apache.hadoop.hive.ql.udf.UDFAsin.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.udf.UDFAsin.java

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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;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.ql.exec.description;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;

@description(name = "asin", value = "_FUNC_(x) - returns the arc sine of x if -1<=x<=1 or NULL otherwise", extended = "Example:\n"
        + "  > SELECT _FUNC_(0) FROM src LIMIT 1;\n" + "  0\n" + "  > SELECT _FUNC_(2) FROM src LIMIT 1;\n"
        + "  NULL")
public class UDFAsin extends UDF {

    private static Log LOG = LogFactory.getLog(UDFAsin.class.getName());

    DoubleWritable result = new DoubleWritable();

    public UDFAsin() {
    }

    public DoubleWritable evaluate(DoubleWritable a) {
        if (a == null) {
            return null;
        } else {
            result.set(Math.asin(a.get()));
            return result;
        }
    }

}