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From "Anand Murugappan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-420) Limit on nothing functionality
Date Fri, 05 Sep 2008 20:54:46 GMT

     [ https://issues.apache.org/jira/browse/PIG-420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Anand Murugappan updated PIG-420:
---------------------------------

    Description: 
Pig 2.0 implements the limit feature but as a standalone statement. 

Limit is very useful in debug mode where we could run queries on smaller amount of data (faster
and on fewer nodes) to iron out issues but in the production mode we would like to run through
all the data. It would be good to have a easy "switch" between debug and prod mode using the
limit statement without having to change the underlying code templates. Given that LIMIT is
a separate standalone statement it gets hard to parametrize the code. 

For instance a query template might look like, 
A = LOAD '...';
B = LIMIT A $N;
C = FOREACH B .... 

In debug mode, we would like to set the variable $N to 100 but in prod mode we would like
to set it to a 'special value' that would not apply LIMIT and letting us run it on all the
data. 


  was:
Pig 2.0 implements the limit feature but as a standalone statement. 

Limit is very useful in debug mode where we could run queries on smaller amount of data (faster
and on fewer nodes) to iron out issues but in the production mode we would like to run through
all the data. It would be good to have a easy "switch" between debug and prod mode using the
limit statement without having to change the underlying code templates. Given that LIMIT is
a separate standalone statement it gets hardware to parametrize the code. 

For instance a query template might look like, 
A = LOAD '...';
B = LIMIT A $N;
C = FOREACH B .... 

In debug mode, we would like to set the variable $N to 100 but in prod mode we would like
to set it to a 'special value' that would not apply LIMIT and letting us run it on all the
data. 



> Limit on nothing functionality
> ------------------------------
>
>                 Key: PIG-420
>                 URL: https://issues.apache.org/jira/browse/PIG-420
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Anand Murugappan
>
> Pig 2.0 implements the limit feature but as a standalone statement. 
> Limit is very useful in debug mode where we could run queries on smaller amount of data
(faster and on fewer nodes) to iron out issues but in the production mode we would like to
run through all the data. It would be good to have a easy "switch" between debug and prod
mode using the limit statement without having to change the underlying code templates. Given
that LIMIT is a separate standalone statement it gets hard to parametrize the code. 
> For instance a query template might look like, 
> A = LOAD '...';
> B = LIMIT A $N;
> C = FOREACH B .... 
> In debug mode, we would like to set the variable $N to 100 but in prod mode we would
like to set it to a 'special value' that would not apply LIMIT and letting us run it on all
the data. 

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