pub unsafe fn ineq_histogram_selectivity( arg_root: *mut PlannerInfo, arg_vardata: *mut VariableStatData, arg_opoid: Oid, arg_opproc: *mut FmgrInfo, arg_isgt: bool, arg_iseq: bool, arg_collation: Oid, arg_constval: Datum, arg_consttype: Oid) -> f64