| Class | Description | 
|---|---|
| MarkerRecord | 
 An empty record used to delineate groups in the GroupByOperator. 
 | 
| Record | 
 A wrapper class for an individual record. 
 | 
| RecordID | 
 Represents the ID of a single record. 
 | 
| RecordIterator | 
 An implementation of Iterator that takes in a RecordID iterator provides iteration over Records 
 | 
| Schema | 
 The Schema of a particular table. 
 | 
| Table | 
 A database table. 
 | 
| Exception | Description | 
|---|---|
| SchemaException | 
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