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Registering an auxiliary equivalence predicate with NULL on one side would be incorrect, because <expr> = NULL is false (even NULL = NULL). Change-Id: Ie10d0e2fa61e5c2c7d4040c8b78d5bfb1a1e2761 Reviewed-on: http://gerrit.cloudera.org:8080/777 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: Internal Jenkins