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Alan Gates commented on HIVE6100:

Ok, never mind my comments then. It makes sense to do this in a UDF.
> Introduce basic set operations as UDFs
> 
>
> Key: HIVE6100
> URL: https://issues.apache.org/jira/browse/HIVE6100
> Project: Hive
> Issue Type: New Feature
> Components: UDF
> Reporter: Kostiantyn Kudriavtsev
> Priority: Minor
> Fix For: 0.13.0
>
>
> Introduce basic set operations:
> 1. Intersection: The intersection of A and B, denoted by A ∩ B, is the set of all things
that are members of both A and B.
> select set_intersection(arr_a, arr_b) from dual
> 2. Union: The union of A and B, denoted by A ∪ B, is the set of all things that are
members of either A or B.
> select set_union(arr_a, arr_b) from dual
> 3. Symmetric difference: the symmetric difference of two sets is the set of elements
which are in either of the sets and not in their intersection.
> select set_symdiff(arr_a, arr_b) from dual

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