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ASF GitHub Bot commented on FLINK-5630: --------------------------------------- Github user aljoscha commented on a diff in the pull request: https://github.com/apache/flink/pull/3207#discussion_r97773952 --- Diff: flink-core/src/main/java/org/apache/flink/api/common/functions/AggregateFunction.java --- @@ -18,14 +18,37 @@ package org.apache.flink.api.common.functions; +import org.apache.flink.annotation.PublicEvolving; + import java.io.Serializable; /** + * The {@code AggregateFunction} is a flexible aggregation function, characterized by the + * following features: + * + * <ul> + * <li>The aggregates may use different types for input values, intermediate aggregates, + * and result type, to support a wide range of aggregation types.</li> + * + * <li>Support for distributive aggregations: Different intermediate aggregates can be + * merged together, to allow for pre-aggregation/final-aggregation optimizations.</li> + * </ul> + * + * <p>The {@code AggregateFunction}'s intermediate aggregate (in-progress aggregation state) + * in called the <i>accumulator</i>. Values are added to the accumulator, and final aggregates are --- End diff -- Typo: "is called" > Followups to AggregationFunction > -------------------------------- > > Key: FLINK-5630 > URL: https://issues.apache.org/jira/browse/FLINK-5630 > Project: Flink > Issue Type: Improvement > Components: Streaming > Affects Versions: 1.3.0 > Reporter: Stephan Ewen > Assignee: Stephan Ewen > Fix For: 1.3.0 > > > Various followup issues to the aggregation function, like > - Allowing different input/output types for the cases where an additional > window apply function is specified > - Adding the {{aggregate()}} methods to the Scala API > - Adding the window translation tests -- This message was sent by Atlassian JIRA (v6.3.4#6332)