org.apache.hadoop.hive.ql.udf.UDFSecond 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 java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import org.apache.hadoop.hive.ql.exec.Description;
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.VectorUDFSecondLong;
import org.apache.hadoop.hive.ql.exec.vector.expressions.VectorUDFSecondString;
import org.apache.hadoop.hive.serde2.io.TimestampWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Text;
/**
* UDFSecond.
*
*/
@Description(name = "second",
value = "_FUNC_(date) - Returns the second of date",
extended = "date is a string in the format of 'yyyy-MM-dd HH:mm:ss' or "
+ "'HH:mm:ss'.\n"
+ "Example:\n "
+ " > SELECT _FUNC_('2009-07-30 12:58:59') FROM src LIMIT 1;\n"
+ " 59\n"
+ " > SELECT _FUNC_('12:58:59') FROM src LIMIT 1;\n" + " 59")
@VectorizedExpressions({VectorUDFSecondLong.class, VectorUDFSecondString.class})
public class UDFSecond extends UDF {
private final SimpleDateFormat formatter1 = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");
private final SimpleDateFormat formatter2 = new SimpleDateFormat("HH:mm:ss");
private final Calendar calendar = Calendar.getInstance();
private final IntWritable result = new IntWritable();
public UDFSecond() {
}
/**
* Get the minute from a date string.
*
* @param dateString
* the dateString in the format of "yyyy-MM-dd HH:mm:ss" or
* "yyyy-MM-dd".
* @return an int from 0 to 59. null if the dateString is not a valid date
* string.
*/
public IntWritable evaluate(Text dateString) {
if (dateString == null) {
return null;
}
try {
Date date = null;
try {
date = formatter1.parse(dateString.toString());
} catch (ParseException e) {
date = formatter2.parse(dateString.toString());
}
calendar.setTime(date);
result.set(calendar.get(Calendar.SECOND));
return result;
} catch (ParseException e) {
return null;
}
}
public IntWritable evaluate(TimestampWritable t) {
if (t == null) {
return null;
}
calendar.setTime(t.getTimestamp());
result.set(calendar.get(Calendar.SECOND));
return result;
}
}