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Values in a STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM slot are float8, not of the type of the column the statistics are for. This bug is at least partly the fault of sloppy specification comments for get_attstatsslot()/free_attstatsslot(): the type OID they want is that of the stavalues entries, not of the underlying column. (I double-checked other callers and they seem to get this right.) Adjust the comments to be more correct. Per buildfarm. Security: CVE-2017-7484