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Operations on Records

Common operation on records ... access record via RecordId: 

Record get_record(Relation rel, RecordId rid) {
    (pid,tid) = rid;
    Page buf = get_page(rel, pid);
    return get_bytes(rel, buf, tid);
}

Cannot use a Record directly; need a Tuple: 

Relation rel = ... // relation schema
Record rec = get_record(rel, rid)
Tuple t = mkTuple(rel, rec)

Once we have a Tuple, we can access individual attributes/fields