项目中使用的hive版本低于0.11,无法使用hive在0.11中新加的开窗分析函数. 在项目中需要使用到row_number()函数的地方,有人写了udf来实现这个功能. new java project, BuildPath add hadoop-core..jar and hive-exec…jar. package myudf; import java.util.Arrays; import org.apache.hadoop.hive.ql.exec.UDF; public final
hive UDF添加的方式 1.添加临时函数,只能在此会话中生效,退出hive自动失效 hive> add jar /home/jtdata/hiveUDF/out0.jar; Added [/home/jtdata/hiveUDF/out0.jar] to class path Added resources: [/home/jtdata/hiveUDF/out0.jar] hive> create temporary function quling as 'com.redhadoop.da
Creating Custom UDFs First, you need to create a new class that extends UDF, with one or more methods named evaluate. package com.example.hive.udf; import org.apache.hadoop.hive.ql.exec.UDF; import org.apache.hadoop.io.Text; public final class Lo
上传jar包到hdfs目录中, hdfs dfs -put /home/user/hive-functions.jar /user/hive/jars/hive-functions.jar create function default.unis_check as 'com.fhpt.hive.functions.UniversityCheckUDF' using jar 'hdfs:/user/hive/jars/hive-functions-0.0.1.jar'; 查看函数: sho
数据文件内容 TEST DATA HERE Good to Go 我们准备写一个函数,把所有字符变为小写. 1.开发UDF package MyTestPackage; import org.apache.hadoop.hive.ql.exec.UDF; import org.apache.hadoop.io.Text; public class ToLowerCase extends UDF { public Text evaluate(final Text s) { return new T
our project use hive 0.10 , and in the hiveql , we need use addMonths function builtin in hive-0.11. so I write this udf and test. java code: package myudf; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Calendar