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MarkRoddy/gist:6137124

Created August 2, 2013 02:37
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gistfile1.txt
Pig will short-circuit Boolean operations when possible. If the first (left) predicate of an and is false,
the second (right) will not be evaluated. So in 1 == 2 and udf(x), the UDF will never be invoked.
Similarly, if the first predicate of an or is true, the second predicate will not be evaluted. 1 == 1 or
udf(x) will never invoke the UDF.
http://chimera.labs.oreilly.com/books/1234000001811/ch05.html#filter
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