Function pgrx_pg_sys::var_eq_const

pub unsafe fn var_eq_const(
    arg_vardata: *mut VariableStatData,
    arg_oproid: Oid,
    arg_collation: Oid,
    arg_constval: Datum,
    arg_constisnull: bool,
    arg_varonleft: bool,
    arg_negate: bool
) -> f64