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Pig >> mail # user >> TOBAG Function on a Tuple?

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TOBAG Function on a Tuple?
I was recently interested in converting a tuple to a bag. I found the
useful looking TOBAG function and figured it was perfect. Problem is,
when I pass it just a tuple, it just takes that tuple and makes a bag
with the tuple as the one item in the bag. If the tuple has a variable
number of items in it, how can I get TOBAG to put each of those items
individually in a bag ( i.e. (1,2,3) => {(1),(2),(3)} )? I know I can
just make a udf for this, but I'm feeling like there's a way to do it
with TOBAG that I'm likely missing.