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https://issues.apache.org/jira/browse/FLINK-4691?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568504#comment-15568504
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ASF GitHub Bot commented on FLINK-4691:
---------------------------------------
Github user twalthr commented on a diff in the pull request:
https://github.com/apache/flink/pull/2562#discussion_r82988652
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/api/java/table/windows/Session.java
---
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.api.java.table.windows;
+
+import org.apache.flink.api.table.SessionWindow;
+
+/**
+ * Helper class for creating a session window. Session windows are ideal
for cases where the
+ * window boundaries need to adjust to the incoming data. In a session
window it is possible to
+ * have windows that start at individual points in time for each key and
that end once there has
+ * been a certain period of inactivity.
+ */
+public class Session {
--- End diff --
During the development I had the problem that I had to use
`Session$.MODULE$.withGap(10)`. See [1]. But now it is not an companion object
anymore, so it works. I will change that.
[1]
http://stackoverflow.com/questions/3282653/how-do-you-call-a-scala-singleton-method-from-java
> Add group-windows for streaming tables
> ---------------------------------------
>
> Key: FLINK-4691
> URL: https://issues.apache.org/jira/browse/FLINK-4691
> Project: Flink
> Issue Type: Sub-task
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Timo Walther
>
> Add Tumble, Slide, Session group-windows for streaming tables as described in
> [FLIP-11|https://cwiki.apache.org/confluence/display/FLINK/FLIP-11%3A+Table+API+Stream+Aggregations].
>
> Implementation of group-windows on streaming tables. This includes
> implementing the API of group-windows, the logical validation for
> group-windows, and the definition of the “rowtime” and “systemtime” keywords.
> Group-windows on batch tables won’t be initially supported and will throw an
> exception.
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