GroupWindow (Flink : 2.0-SNAPSHOT API)

java.lang.Object
- org.apache.flink.table.api.GroupWindow

Direct Known Subclasses:

SessionWithGapOnTimeWithAlias, SlideWithSizeAndSlideOnTimeWithAlias, TumbleWithSizeOnTimeWithAlias
```
@PublicEvolving
public abstract class GroupWindow
extends Object
```
A group window specification.
Group windows group rows based on time or row-count intervals and is therefore essentially a special type of groupBy. Just like groupBy, group windows allow to compute aggregates on groups of elements.
Infinite streaming tables can only be grouped into time or row intervals. Hence window grouping is required to apply aggregations on streaming tables.
For finite batch tables, group windows provide shortcuts for time-based groupBy.

- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  Expression getAlias()
  
  Expression getTimeField()
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getAlias
```
public Expression getAlias()
```

getTimeField
```
public Expression getTimeField()
```