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"
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
