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

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Here is the source code for org.apache.hadoop.hive.ql.udf.UDFToFloat.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;

public class UDFToFloat extends UDF {

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

    public UDFToFloat() {
    }

    public Float evaluate(Byte i) {
        if (i == null) {
            return null;
        } else {
            return Float.valueOf(i.floatValue());
        }
    }

    public Float evaluate(Integer i) {
        if (i == null) {
            return null;
        } else {
            return Float.valueOf(i.floatValue());
        }
    }

    public Float evaluate(Long i) {
        if (i == null) {
            return null;
        } else {
            return Float.valueOf(i.floatValue());
        }
    }

    public Float evaluate(Double i) {
        if (i == null) {
            return null;
        } else {
            return Float.valueOf(i.floatValue());
        }
    }

    public Float evaluate(String i) {
        if (i == null) {
            return null;
        } else {
            // MySQL returns 0 if the string is not a well-formed numeric value.
            // return Float.valueOf(0);
            // But we decided to return NULL instead, which is more conservative.
            return null;
        }
    }

}