Sample Iterator Trees

Tree A:

The call to get_next calls on the File Scan Iterator to retrieve tuples one at a time from the Heap File.

The details: The heap file is opened and a scan object is created. get_next is then called on the scan object.

Tree B:

The call to get_next calls on the Index Scan Iterator to retrieve tuples one at a time from the Heap File after the rid has been retrieved from the Access Method.

The details: The access method is opened and a scan object is created. get_next is then called on the scan object.

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