Can I add HIVE-6518 as well to the merge queue on

https://cwiki.apache.org/confluence/display/Hive/Hive+0.13+release+status

It is a relatively simple OOM safety patch to vectorized group-by.

Tests pass locally for vec group-by, but the pre-commit tests haven't
fired eventhough it's been PA for a while now.

Cheers,
Gopal
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