org.apache.hadoop.hive.ql.udf.UDFToDouble Maven / Gradle / Ivy
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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.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.hive.ql.exec.vector.VectorizedExpressions;
import org.apache.hadoop.hive.ql.exec.vector.expressions.CastDecimalToDouble;
import org.apache.hadoop.hive.ql.exec.vector.expressions.CastStringToDouble;
import org.apache.hadoop.hive.ql.exec.vector.expressions.gen.CastLongToDouble;
import org.apache.hadoop.hive.ql.exec.vector.expressions.CastTimestampToDouble;
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.hive.serde2.io.TimestampWritable;
import org.apache.hadoop.hive.serde2.lazy.LazyUtils;
import org.apache.hadoop.io.BooleanWritable;
import org.apache.hadoop.io.FloatWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
/**
* UDFToDouble.
*
*/
@VectorizedExpressions({CastTimestampToDouble.class, CastLongToDouble.class,
CastDecimalToDouble.class, CastStringToDouble.class})
public class UDFToDouble extends UDF {
private final DoubleWritable doubleWritable = new DoubleWritable();
public UDFToDouble() {
}
/**
* Convert from void to a double. This is called for CAST(... AS DOUBLE)
*
* @param i
* The void value to convert
* @return DoubleWritable
*/
public DoubleWritable evaluate(NullWritable i) {
return null;
}
/**
* Convert from boolean to a double. This is called for CAST(... AS DOUBLE)
*
* @param i
* The boolean value to convert
* @return DoubleWritable
*/
public DoubleWritable evaluate(BooleanWritable i) {
if (i == null) {
return null;
} else {
doubleWritable.set(i.get() ? 1.0 : 0.0);
return doubleWritable;
}
}
/**
* Convert from boolean to a double. This is called for CAST(... AS DOUBLE)
*
* @param i
* The byte value to convert
* @return DoubleWritable
*/
public DoubleWritable evaluate(ByteWritable i) {
if (i == null) {
return null;
} else {
doubleWritable.set(i.get());
return doubleWritable;
}
}
/**
* Convert from short to a double. This is called for CAST(... AS DOUBLE)
*
* @param i
* The short value to convert
* @return DoubleWritable
*/
public DoubleWritable evaluate(ShortWritable i) {
if (i == null) {
return null;
} else {
doubleWritable.set(i.get());
return doubleWritable;
}
}
/**
* Convert from integer to a double. This is called for CAST(... AS DOUBLE)
*
* @param i
* The integer value to convert
* @return DoubleWritable
*/
public DoubleWritable evaluate(IntWritable i) {
if (i == null) {
return null;
} else {
doubleWritable.set(i.get());
return doubleWritable;
}
}
/**
* Convert from long to a double. This is called for CAST(... AS DOUBLE)
*
* @param i
* The long value to convert
* @return DoubleWritable
*/
public DoubleWritable evaluate(LongWritable i) {
if (i == null) {
return null;
} else {
doubleWritable.set(i.get());
return doubleWritable;
}
}
/**
* Convert from float to a double. This is called for CAST(... AS DOUBLE)
*
* @param i
* The float value to convert
* @return DoubleWritable
*/
public DoubleWritable evaluate(FloatWritable i) {
if (i == null) {
return null;
} else {
doubleWritable.set(i.get());
return doubleWritable;
}
}
/**
* Convert from string to a double. This is called for CAST(... AS DOUBLE)
*
* @param i
* The string value to convert
* @return DoubleWritable
*/
public DoubleWritable evaluate(Text i) {
if (i == null) {
return null;
} else {
if (!LazyUtils.isNumberMaybe(i.getBytes(), 0, i.getLength())) {
return null;
}
try {
doubleWritable.set(Double.parseDouble(i.toString()));
return doubleWritable;
} catch (NumberFormatException e) {
// MySQL returns 0 if the string is not a well-formed double value.
// But we decided to return NULL instead, which is more conservative.
return null;
}
}
}
public DoubleWritable evaluate(TimestampWritable i) {
if (i == null) {
return null;
} else {
try {
doubleWritable.set(i.getDouble());
return doubleWritable;
} catch (NumberFormatException e) {
// MySQL returns 0 if the string is not a well-formed numeric value.
// But we decided to return NULL instead, which is more conservative.
return null;
}
}
}
public DoubleWritable evaluate(HiveDecimalWritable i) {
if (i == null || !i.isSet()) {
return null;
} else {
doubleWritable.set(i.doubleValue());
return doubleWritable;
}
}
}