Function pgx_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