Function pgx::htup::heap_getattr_datum_ex

pub fn heap_getattr_datum_ex(
    tuple: &PgBox<HeapTupleData>, 
    attno: usize, 
    tupdesc: &PgTupleDesc<'_>
) -> DatumWithTypeInfo

Similar to heap_getattr(), but returns extended information about the requested attribute attno is 1-based