hive 自定义UDF

 <dependency>
      <groupId>org.apache.hive</groupId>
      <artifactId>hive-exec</artifactId>
      <version>1.1.0</version>
    </dependency>

package com.cslc;
import org.apache.hadoop.hive.ql.exec.UDF;
public class testudf  extends  UDF{
    public static String evaluate(String time){

        String day=time.split("\t")[0];
        String result =day.substring(0,4)+"/"+day.substring(5,7)+"/"+day.substring(8,10);
        return  result;
    }

    public static void main(String[] args) {

        String date1=("2017-06-13 18:00:01");
        System.out.println(evaluate(date1));
    }
}