GroupByColumnSelectorStrategyFactory (druid-processing 30.0.1 API)

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

All Methods Instance Methods Concrete Methods
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 Detail
  - GroupByColumnSelectorStrategyFactory
```
public GroupByColumnSelectorStrategyFactory()
```
- Method Detail
  - 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>