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Fix some additional cases of VACUUM "No one parent tuple was found" error
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Prevent VACUUM from being called inside a function (Bruce)
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Ensure pg_clog updates are sync'd to disk before marking checkpoint complete
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Avoid integer overflow during large hash joins
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Make GROUP commands work when pg_group.grolist is large enough to be toasted
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Fix errors in datetime tables; some timezone names weren't being recognized
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Fix integer overflows in circle_poly(), path_encode(), path_add() (Neil)
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Repair long-standing logic errors in lseg_eq(), lseg_ne(), lseg_center()
