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https://issues.apache.org/jira/browse/PIG-1713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13009280#comment-13009280
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Gianmarco De Francisci Morales commented on PIG-1713:
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To support the simple use case one would simply need to allow expressions in
the SAMPLE argument.
This should mainly require changes to the front-end I assume.
For more complex techniques like reservoir one should implement a new
(physical?) operator.
What is the exact scope/goal of the project?
Maybe it could be split in 2 parts. Supporting sampling with variable arguments
as the first part, and adding more complex techniques as a second part?
> SAMPLE command should accept parameters
> ---------------------------------------
>
> Key: PIG-1713
> URL: https://issues.apache.org/jira/browse/PIG-1713
> Project: Pig
> Issue Type: Improvement
> Reporter: Viraj Bhat
> Labels: gsoc2011
> Fix For: 0.10
>
>
> I have a script which takes in a command line parameter.
> {code}
> pig -p number=100 script.pig
> {code}
> The script contains the following parameters:
> {code}
> A = load '/user/viraj/test' using PigStorage() as (a,b,c);
> B = SAMPLE A 1/$number;
> dump B;
> {code}
> Realistic use cases of SAMPLE require statisticians to calculate SAMPLE data
> on demand.
> Ideally I would like to calculate SAMPLE from within Pig script without
> having to run one Pig script first get it's results and another to pass the
> results.
> Ideal use case:
> {code}
> A = load '/user/viraj/input' using PigStorage() as (col1, col2, col3);
> ...
> ...
> W = group X by col1;
> Z = foreach Y generate AVG(X);
> AA = load '/user/viraj/test' using PigStorage() as (a,b,c);
> BB = SAMPLE AA 1/Z;
> dump BB;
> {code}
> Viraj
> Limit should has the same case.
> This is a candidate project for Google summer of code 2011. More information
> about the program can be found at http://wiki.apache.org/pig/GSoc2011
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