| Interface | Description | 
|---|---|
| Task | Task is one step on the way to producing a result | 
| Class | Description | 
|---|---|
| AggregateQuery | resolve the columns, num rows not the same | 
| FilterData | filter a given result set by a given constraint | 
| LoadData | Load any data from a table into data | 
| NonAggregateQuery | resolve the columns, num rows stays same | 
| SimpleSort | Sort the given data by the given columns | 
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