Package org.apache.flink.table.api

Class GroupWindow

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 Details

    • getAlias

      public org.apache.flink.table.expressions.Expression getAlias()

    • getTimeField

      public org.apache.flink.table.expressions.Expression getTimeField()