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