org.apache.hadoop.hive.ql.udf.UDFToShort 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.CastDecimalToLong;
import org.apache.hadoop.hive.ql.exec.vector.expressions.gen.CastDoubleToLong;
import org.apache.hadoop.hive.ql.exec.vector.expressions.gen.CastTimestampToLongViaLongToLong;
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.LazyShort;
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;
/**
* UDFToShort.
*
*/
@VectorizedExpressions({CastTimestampToLongViaLongToLong.class, CastDoubleToLong.class,
CastDecimalToLong.class})
public class UDFToShort extends UDF {
ShortWritable shortWritable = new ShortWritable();
public UDFToShort() {
}
/**
* Convert from void to a short. This is called for CAST(... AS SMALLINT)
*
* @param i
* The void value to convert
* @return ShortWritable
*/
public ShortWritable evaluate(NullWritable i) {
return null;
}
/**
* Convert from boolean to a short. This is called for CAST(... AS SMALLINT)
*
* @param i
* The boolean value to convert
* @return ShortWritable
*/
public ShortWritable evaluate(BooleanWritable i) {
if (i == null) {
return null;
} else {
shortWritable.set(i.get() ? (short) 1 : (short) 0);
return shortWritable;
}
}
/**
* Convert from byte to a short. This is called for CAST(... AS SMALLINT)
*
* @param i
* The byte value to convert
* @return ShortWritable
*/
public ShortWritable evaluate(ByteWritable i) {
if (i == null) {
return null;
} else {
shortWritable.set(i.get());
return shortWritable;
}
}
/**
* Convert from integer to a short. This is called for CAST(... AS SMALLINT)
*
* @param i
* The integer value to convert
* @return ShortWritable
*/
public ShortWritable evaluate(IntWritable i) {
if (i == null) {
return null;
} else {
shortWritable.set((short) i.get());
return shortWritable;
}
}
/**
* Convert from long to a short. This is called for CAST(... AS SMALLINT)
*
* @param i
* The long value to convert
* @return ShortWritable
*/
public ShortWritable evaluate(LongWritable i) {
if (i == null) {
return null;
} else {
shortWritable.set((short) i.get());
return shortWritable;
}
}
/**
* Convert from float to a short. This is called for CAST(... AS SMALLINT)
*
* @param i
* The float value to convert
* @return ShortWritable
*/
public ShortWritable evaluate(FloatWritable i) {
if (i == null) {
return null;
} else {
shortWritable.set((short) i.get());
return shortWritable;
}
}
/**
* Convert from double to a short. This is called for CAST(... AS SMALLINT)
*
* @param i
* The double value to convert
* @return ShortWritable
*/
public ShortWritable evaluate(DoubleWritable i) {
if (i == null) {
return null;
} else {
shortWritable.set((short) i.get());
return shortWritable;
}
}
/**
* Convert from string to a short. This is called for CAST(... AS SMALLINT)
*
* @param i
* The string value to convert
* @return ShortWritable
*/
public ShortWritable evaluate(Text i) {
if (i == null) {
return null;
} else {
try {
shortWritable.set(LazyShort.parseShort(i.getBytes(), 0, i.getLength(),
10));
return shortWritable;
} catch (NumberFormatException e) {
// MySQL returns 0 if the string is not a well-formed numeric value.
// return Byte.valueOf(0);
// But we decided to return NULL instead, which is more conservative.
return null;
}
}
}
public ShortWritable evaluate(TimestampWritable i) {
if (i == null) {
return null;
} else {
shortWritable.set((short) i.getSeconds());
return shortWritable;
}
}
public ShortWritable evaluate(HiveDecimalWritable i) {
if (i == null) {
return null;
} else {
shortWritable.set(i.getHiveDecimal().shortValue());
return shortWritable;
}
}
}