TimestampAggregatorFactory (io.druid:druid 0.10.0 API)

java.lang.Object
- io.druid.query.aggregation.AggregatorFactory
- - io.druid.query.aggregation.TimestampAggregatorFactory

All Implemented Interfaces:

Cacheable

Direct Known Subclasses:

TimestampMaxAggregatorFactory, TimestampMinAggregatorFactory
```
public class TimestampAggregatorFactory
extends AggregatorFactory
```

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Object`	`combine(Object lhs, Object rhs)` A method that knows how to combine the outputs of the getIntermediate() method from the Aggregators produced via factorize().
`Object`	`deserialize(Object object)` A method that knows how to "deserialize" the object from whatever form it might have been put into in order to transfer via JSON.
`boolean`	`equals(Object o)`
`Aggregator`	`factorize(ColumnSelectorFactory metricFactory)`
`BufferAggregator`	`factorizeBuffered(ColumnSelectorFactory metricFactory)`
`Object`	`finalizeComputation(Object object)` "Finalizes" the computation of an object.
`byte[]`	`getCacheKey()` Get a byte array used as a cache key.
`AggregatorFactory`	`getCombiningFactory()` Returns an AggregatorFactory that can be used to combine the output of aggregators from this factory.
`Comparator`	`getComparator()`
`String`	`getFieldName()`
`int`	`getMaxIntermediateSize()` Returns the maximum size that this aggregator will require in bytes for intermediate storage of results.
`AggregatorFactory`	`getMergingFactory(AggregatorFactory other)` Returns an AggregatorFactory that can be used to merge the output of aggregators from this factory and other factory.
`String`	`getName()`
`List<AggregatorFactory>`	`getRequiredColumns()` Gets a list of all columns that this AggregatorFactory will scan
`String`	`getTimeFormat()`
`String`	`getTypeName()`
`int`	`hashCode()`
`List<String>`	`requiredFields()`

Methods inherited from class io.druid.query.aggregation.AggregatorFactory
mergeAggregators

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - factorize
```
public Aggregator factorize(ColumnSelectorFactory metricFactory)
```
    Specified by:
    
    factorize in class AggregatorFactory
  - factorizeBuffered
```
public BufferAggregator factorizeBuffered(ColumnSelectorFactory metricFactory)
```
    Specified by:
    
    factorizeBuffered in class AggregatorFactory
  - getComparator
```
public Comparator getComparator()
```
    Specified by:
    
    getComparator in class AggregatorFactory
  - combine
```
public Object combine(Object lhs,
                      Object rhs)
```
    Description copied from class: AggregatorFactory
    
    A method that knows how to combine the outputs of the getIntermediate() method from the Aggregators produced via factorize(). Note, even though this is called combine, this method's contract *does* allow for mutation of the input objects. Thus, any use of lhs or rhs after calling this method is highly discouraged.
    
    Specified by:
    
    combine in class AggregatorFactory
    
    Parameters:
    
    lhs - The left hand side of the combine
    
    rhs - The right hand side of the combine
    
    Returns:
    
    an object representing the combination of lhs and rhs, this can be a new object or a mutation of the inputs
  - getCombiningFactory
```
public AggregatorFactory getCombiningFactory()
```
    Description copied from class: AggregatorFactory
    
    Returns an AggregatorFactory that can be used to combine the output of aggregators from this factory. This generally amounts to simply creating a new factory that is the same as the current except with its input column renamed to the same as the output column.
    
    Specified by:
    
    getCombiningFactory in class AggregatorFactory
    
    Returns:
    
    a new Factory that can be used for operations on top of data output from the current factory.
  - getMergingFactory
```
public AggregatorFactory getMergingFactory(AggregatorFactory other)
                                    throws AggregatorFactoryNotMergeableException
```
    Description copied from class: AggregatorFactory
    
    Returns an AggregatorFactory that can be used to merge the output of aggregators from this factory and other factory. This method is relevant only for AggregatorFactory which can be used at ingestion time.
    
    Overrides:
    
    getMergingFactory in class AggregatorFactory
    
    Returns:
    
    a new Factory that can be used for merging the output of aggregators from this factory and other.
    
    Throws:
    
    AggregatorFactoryNotMergeableException
  - getRequiredColumns
```
public List<AggregatorFactory> getRequiredColumns()
```
    Description copied from class: AggregatorFactory
    
    Gets a list of all columns that this AggregatorFactory will scan
    
    Specified by:
    
    getRequiredColumns in class AggregatorFactory
    
    Returns:
    
    AggregatorFactories for the columns to scan of the parent AggregatorFactory
  - deserialize
```
public Object deserialize(Object object)
```
    Description copied from class: AggregatorFactory
    
    A method that knows how to "deserialize" the object from whatever form it might have been put into in order to transfer via JSON.
    
    Specified by:
    
    deserialize in class AggregatorFactory
    
    Parameters:
    
    object - the object to deserialize
    
    Returns:
    
    the deserialized object
  - finalizeComputation
```
public Object finalizeComputation(Object object)
```
    Description copied from class: AggregatorFactory
    
    "Finalizes" the computation of an object. Primarily useful for complex types that have a different mergeable intermediate format than their final resultant output.
    
    Specified by:
    
    finalizeComputation in class AggregatorFactory
    
    Parameters:
    
    object - the object to be finalized
    
    Returns:
    
    the finalized value that should be returned for the initial query
  - getName
```
public String getName()
```
    Specified by:
    
    getName in class AggregatorFactory
  - getFieldName
```
public String getFieldName()
```
  - getTimeFormat
```
public String getTimeFormat()
```
  - requiredFields
```
public List<String> requiredFields()
```
    Specified by:
    
    requiredFields in class AggregatorFactory
  - getCacheKey
```
public byte[] getCacheKey()
```
    Description copied from interface: Cacheable
    
    Get a byte array used as a cache key.
    
    Returns:
    
    a cache key
  - getTypeName
```
public String getTypeName()
```
    Specified by:
    
    getTypeName in class AggregatorFactory
  - getMaxIntermediateSize
```
public int getMaxIntermediateSize()
```
    Description copied from class: AggregatorFactory
    
    Returns the maximum size that this aggregator will require in bytes for intermediate storage of results.
    
    Specified by:
    
    getMaxIntermediateSize in class AggregatorFactory
    
    Returns:
    
    the maximum number of bytes that an aggregator of this type will require for intermediate result storage.
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object

Class TimestampAggregatorFactory

Method Summary

Methods inherited from class io.druid.query.aggregation.AggregatorFactory

Methods inherited from class java.lang.Object

Method Detail

factorize

factorizeBuffered

getComparator

combine

getCombiningFactory

getMergingFactory

getRequiredColumns

deserialize

finalizeComputation

getName

getFieldName

getTimeFormat

requiredFields

getCacheKey

getTypeName

getMaxIntermediateSize

equals

hashCode