[HIVE-3559] UDF RIGHT(string,position) to HIVE

• Type: New Feature
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 0.9.0
• Component/s: UDF
• Assignee: Vinaya Varghese
• Reporter: Vinaya Varghese
• Created: 09/Oct/12 12:01
• Updated: 26/Feb/16 09:09

Description

Introduction

UDF (User Defined Function) to obtain the rightmost 'n' characters from a string in HIVE.

Relevance

Current releases of Hive lacks a function which would returns the rightmost len characters from the string str, or NULL if any argument is NULL. The function LEFT(string,length) would return the rightmost 'length' characters from the string 'string' , or NULL if any argument is NULL which would be useful while using HiveQL. This would find its use in all the technical aspects where the concept of strings are used.

Functionality :-

Function Name: RIGHT(string,length)

Returns the rightmost 'length' characters from the string or NULL if any argument is NULL.
Example: hive>SELECT LEFT('https://www.irctc.com',3);
-> 'com'

Usage :-
Case 1: To query a table to find details based on an https request
Table :-Transaction
Request_id|date|period_id|url_name

0001|01/07/2012|110001|https://www.irctc.com

0002|02/07/2012|110001|https://nextstep.tcs.com

0003|03/07/2012|110001|https://www.hdfcbank.com

0005|01/07/2012|110001|http://www.lmnm.org

0006|08/07/2012|110001|http://nextstart.gov

0007|10/07/2012|110001|https://netbanking.icicibank.com

0012|21/07/2012|110001|http://www.people.nic

0026|08/07/2012|110001|http://nextprobs.gov

00023|25/07/2012|110001|https://netbanking.canarabank.com

Query : select * from transaction where RIGHT(url_name,3)='com';

Result :-
0001|01/07/2012|110001|https://www.irctc.com
0002|02/07/2012|110001|https://nextstep.tcs.com
0003|03/07/2012|110001|https://www.hdfcbank.com
0007|10/07/2012|110001|https://netbanking.icicibank.com
00023|25/07/2012|110001|https://netbanking.canarabank.com