pub unsafe fn build_implied_join_equality(
    arg_root: *mut PlannerInfo,
    arg_opno: Oid,
    arg_collation: Oid,
    arg_item1: *mut Expr,
    arg_item2: *mut Expr,
    arg_qualscope: Relids,
    arg_nullable_relids: Relids,
    arg_security_level: Index
) -> *mut RestrictInfo