启动的时候
spark2-shell --jars hdfs:///xxx/a.jar
进入shell
import org.apache.spark.sql.types.StringType;
import com.test.udf.MyUdf;
spark.sqlContext.udf.register("addressUdf", new MyUdf(),StringType);
val a=spark.sql("select addressUdf('xxxx')");
a.show();
