org.apache.hadoop.hive.ql.udf.UDFToFloat Maven / Gradle / Ivy
/**
* 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.gen.CastLongToDouble;
import org.apache.hadoop.hive.ql.exec.vector.expressions.gen.CastTimestampToDoubleViaLongToDouble;
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.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;
/**
* UDFToFloat.
*
*/
@VectorizedExpressions({CastTimestampToDoubleViaLongToDouble.class, CastLongToDouble.class,
CastDecimalToDouble.class})
public class UDFToFloat extends UDF {
private final FloatWritable floatWritable = new FloatWritable();
public UDFToFloat() {
}
/**
* Convert from void to a float. This is called for CAST(... AS FLOAT)
*
* @param i
* The void value to convert
* @return FloatWritable
*/
public FloatWritable evaluate(NullWritable i) {
return null;
}
/**
* Convert from boolean to a float. This is called for CAST(... AS FLOAT)
*
* @param i
* The boolean value to convert
* @return FloatWritable
*/
public FloatWritable evaluate(BooleanWritable i) {
if (i == null) {
return null;
} else {
floatWritable.set(i.get() ? (float) 1.0 : (float) 0.0);
return floatWritable;
}
}
/**
* Convert from byte to a float. This is called for CAST(... AS FLOAT)
*
* @param i
* The byte value to convert
* @return FloatWritable
*/
public FloatWritable evaluate(ByteWritable i) {
if (i == null) {
return null;
} else {
floatWritable.set(i.get());
return floatWritable;
}
}
/**
* Convert from short to a float. This is called for CAST(... AS FLOAT)
*
* @param i
* The short value to convert
* @return FloatWritable
*/
public FloatWritable evaluate(ShortWritable i) {
if (i == null) {
return null;
} else {
floatWritable.set(i.get());
return floatWritable;
}
}
/**
* Convert from integer to a float. This is called for CAST(... AS FLOAT)
*
* @param i
* The integer value to convert
* @return FloatWritable
*/
public FloatWritable evaluate(IntWritable i) {
if (i == null) {
return null;
} else {
floatWritable.set(i.get());
return floatWritable;
}
}
/**
* Convert from long to a float. This is called for CAST(... AS FLOAT)
*
* @param i
* The long value to convert
* @return FloatWritable
*/
public FloatWritable evaluate(LongWritable i) {
if (i == null) {
return null;
} else {
floatWritable.set(i.get());
return floatWritable;
}
}
/**
* Convert from double to a float. This is called for CAST(... AS FLOAT)
*
* @param i
* The double value to convert
* @return FloatWritable
*/
public FloatWritable evaluate(DoubleWritable i) {
if (i == null) {
return null;
} else {
floatWritable.set((float) i.get());
return floatWritable;
}
}
/**
* Convert from string to a float. This is called for CAST(... AS FLOAT)
*
* @param i
* The string value to convert
* @return FloatWritable
*/
public FloatWritable evaluate(Text i) {
if (i == null) {
return null;
} else {
try {
floatWritable.set(Float.valueOf(i.toString()));
return floatWritable;
} 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 FloatWritable evaluate(TimestampWritable i) {
if (i == null) {
return null;
} else {
try {
floatWritable.set((float) i.getDouble());
return floatWritable;
} 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 FloatWritable evaluate(HiveDecimalWritable i) {
if (i == null) {
return null;
} else {
floatWritable.set(i.getHiveDecimal().floatValue());
return floatWritable;
}
}
}