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https://issues.apache.org/jira/browse/PIG-4673?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Murali Rao updated PIG-4673:
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Description:
Lets say we have a string = 'A1B2C3D4'. Our objective is to replace A with 1, B
with 2, C with 3 and D with 4 to derive 11223344 string.
Using existing REPLACE method
REPLACE(REPLACE(REPLACE(REPLACE('ABCD','A','1'),'B','2'),'C','3'),'D','4')
With proposed UDF : REPLACE_MULTI method
General Syntax :
REPLACE_MULTI( 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.
was:
Lets say we have a string = 'A1B2C3D4'. Our objective is to replace A with 1, B
with 2, C with 3 and D with 4 to derive 11223344 string.
Using existing REPLACE method
REPLACE(REPLACE(REPLACE(REPLACE('ABCD','A','1'),'B','2'),'C','3'),'D','4')
With proposed UDF : REPLACE_MULTI method
General Syntax :
REPLACE_MULTI( 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.
> 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 = 'A1B2C3D4'. Our objective is to replace A with 1,
> B with 2, C with 3 and D with 4 to derive 11223344 string.
> Using existing REPLACE method
> REPLACE(REPLACE(REPLACE(REPLACE('ABCD','A','1'),'B','2'),'C','3'),'D','4')
> With proposed UDF : REPLACE_MULTI method
> General Syntax :
> REPLACE_MULTI( 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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