The function hyperLogLogMerge() is faulty [1]. It has no current callers, though. I propose that we rip it out, as in the attached patch. [1] http://www.postgresql.org/message-id/CAM3SWZT-i6R9JU5YXa8MJUou2_r3LfGJZpQ9tYa1BYxfkj0=cQ@mail.gmail.com -- Peter Geoghegan
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