How to customize hive udf

This article mainly introduces how to customize hive udf, which is very detailed and has certain reference value. Friends who are interested must finish reading it!

I have been using hive for some time, but I have never written about it, because the main use of hive is nothing more than the process of create table,upload data,CRUD. Later work need to use some commonly used methods, learned that hive supports UDF (User Define Function), see some articles found that UDF to write is also very easy, inherit UDF and then rewrite evaluate method, the following to an ip2long to the method as a reference.

1. Write UDF classes

Import org.apache.hadoop.hive.ql.exec.UDF

Public class NewIP2Long extends UDF {

Public static long ip2long (String ip) {

String [] ips = ip.split ("[.]")

Long ipNum = 0

If (ips = = null) {

Return 0

}

For (int I = 0; I < ips.length; iTunes +) {

IpNum = ipNum