Package com.illumon.iris.db.v2.by

Interface AggregationContextTransformer

All Known Implementing Classes:

NullColumnAggregationTransformer

public interface AggregationContextTransformer

Transformer to adjust aggregation results for operation building.

Field Summary

Fields

Modifier and Type	Field	Description
static final AggregationContextTransformer[]	ZERO_LENGTH_AGGREGATION_CONTEXT_TRANSFORMER_ARRAY

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.