| 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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