Murali Rao created PIG-4673:
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Summary: Built In UDF - REPLACE_MULTI : For a given string, search
and replace all occurrences of search keys with replacement values.
Key: PIG-4673
URL: https://issues.apache.org/jira/browse/PIG-4673
Project: Pig
Issue Type: New Feature
Components: piggybank
Reporter: Murali Rao
Assignee: Murali Rao
Priority: Minor
Lets say we have a string = 'ABCD'. Our objective is to replace A with 1, B
with 2, C with 3 and D with 4 to derive 1234 string.
Using existing REPLACE method
REPLACE(REPLACE(REPLACE(REPLACE('ABCD','1'),'2'),'3'),'4')
With Proposed UDF : REPLACE_MULTI method
General Syntax :
MULTI_REPLACE(String sourceString,[search1#replacement1, ...])
REPLACE_MULTI('abcd',['A'#'1','B'#'2', 'C'#'3', 'D'#'4'])
Advantage :
1. Function calls are reduced.
2. Ease to code and better readable.
Let me know your thoughts/ inputs on having this UDF in Piggy Bank. Will take
this up based on this.
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