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From "Eli Finkelshteyn (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2529) Creation of a Python PiggyBank
Date Mon, 13 Feb 2012 15:46:59 GMT

    [ https://issues.apache.org/jira/browse/PIG-2529?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206943#comment-13206943
] 

Eli Finkelshteyn commented on PIG-2529:
---------------------------------------

That's true. The original function worked for my original case, but something more general
and useful would convert a bag of tuples to just a tuple of the items that were inside the
tuples in the original bag (i.e. essentially flattening the original bag by one dimension).
This converts:

    {(1,4),(2,5),(3,6)} => (1,4,2,5,3,6)

The function that accomplishes this is:

    @outputSchema("t:tuple()") 
    def bagToTuple(bag): 
        t = sum(bag,tuple([]))
        return t
                
> Creation of a Python PiggyBank
> ------------------------------
>
>                 Key: PIG-2529
>                 URL: https://issues.apache.org/jira/browse/PIG-2529
>             Project: Pig
>          Issue Type: New Feature
>          Components: piggybank
>            Reporter: Eli Finkelshteyn
>            Priority: Minor
>              Labels: piggybank, python
>
> As per a conversation on the Pig user list, I think it makes sense to create a PiggyBank
for Python functions. To get us started, here's something short and quick I wrote to convert
a bag of single item tuples to one single tuple:
> @outputSchema("t:tuple()")                                                          
  
> def bagToTuple(bag):                                                                
          
>   t = tuple([item[0] for item in bag])                                              
  
>   return t

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