Explanation:
DIFF takes two bags as arguments and compares them. Any tuples
that are in one bag but not the other are returned.
- If the
fields are not bags then they will be returned if they do not match,
-or
an empty bag will be returned if the two records match.
The implementation assumes that both bags being passed to this function will
fit entirely into memory simultaneously. If that is not the case the UDF
will still function, but it will be
very slow.
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