Package org.apache.druid.query.groupby.epinephelinae

Class GroupByColumnSelectorStrategyFactory

java.lang.Object

org.apache.druid.query.groupby.epinephelinae.GroupByColumnSelectorStrategyFactory

All Implemented Interfaces:

ColumnSelectorStrategyFactory<GroupByColumnSelectorStrategy>

public class GroupByColumnSelectorStrategyFactory
extends Object
implements ColumnSelectorStrategyFactory<GroupByColumnSelectorStrategy>

Creates ColumnSelectorStrategys for grouping dimensions If the type is STRING, then it delegates the group by handling to KeyMappingMultiValueGroupByColumnSelectorStrategy which is specialized for DimensionSelectors and multi-value dimensions. If the type is numeric, then it delegates the handling to the FixedWidthGroupByColumnSelectorStrategy Else, it delegates the handling to DictionaryBuildingGroupByColumnSelectorStrategy which is a generic strategy and builds dictionaries on the fly.

Constructor Summary

Constructors

Constructor	Description
GroupByColumnSelectorStrategyFactory()

Method Summary

Modifier and Type	Method	Description
GroupByColumnSelectorStrategy	makeColumnSelectorStrategy(ColumnCapabilities capabilities, ColumnValueSelector selector, String dimension)
boolean	supportsComplexTypes()	Whether the strategy supports complex types.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

GroupByColumnSelectorStrategyFactory

public GroupByColumnSelectorStrategyFactory()

Method Details

makeColumnSelectorStrategy

public GroupByColumnSelectorStrategy makeColumnSelectorStrategy(ColumnCapabilities capabilities,
 ColumnValueSelector selector,
 String dimension)

Specified by:

makeColumnSelectorStrategy in interface ColumnSelectorStrategyFactory<GroupByColumnSelectorStrategy>

supportsComplexTypes

public boolean supportsComplexTypes()

Description copied from interface: ColumnSelectorStrategyFactory

Whether the strategy supports complex types. If a strategy doesn't support the complex types, they can either throw an unsupported exception or treat them like strings.

Specified by:

supportsComplexTypes in interface ColumnSelectorStrategyFactory<GroupByColumnSelectorStrategy>