public interface AggregationContextTransformer

Transformer to adjust aggregation results for operation building.

Method Summary

Modifier and Type	Method	Description
`default void`	`resultColumnFixup(Map<String,ColumnSource<?>> resultColumns)`	After we have created the key columns, and the default result columns, allow each transformer to add additional columns to the result set that are not handled by the regular modified column set transformer, etc.
`default void`	`setReverseLookupFunction(ToIntFunction<Object> reverseLookup)`	The helper calls the transformer with a suitable reverse lookup function for this table.
`default QueryTable`	`transformResult(QueryTable table)`	Before we return the result, each transformer has a chance to replace it or change it as it sees fit.

Field Details
- ZERO_LENGTH_AGGREGATION_CONTEXT_TRANSFORMER_ARRAY
  
  static final AggregationContextTransformer[] ZERO_LENGTH_AGGREGATION_CONTEXT_TRANSFORMER_ARRAY
Method Details
- resultColumnFixup
  
  default void resultColumnFixup(Map<String,ColumnSource<?>> resultColumns)
  
  After we have created the key columns, and the default result columns, allow each transformer to add additional columns to the result set that are not handled by the regular modified column set transformer, etc. logic.
- transformResult
  
  default QueryTable transformResult(QueryTable table)
  
  Before we return the result, each transformer has a chance to replace it or change it as it sees fit. Practically this is used to change the attributes for rollups.
- setReverseLookupFunction
  
  default void setReverseLookupFunction(ToIntFunction<Object> reverseLookup)
  
  The helper calls the transformer with a suitable reverse lookup function for this table.
  
  Parameters:
  
  reverseLookup - a function that translates an object to an integer position in our output.

Interface AggregationContextTransformer