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https://issues.apache.org/jira/browse/FLINK-9877?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16556025#comment-16556025
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ASF GitHub Bot commented on FLINK-9877:
---------------------------------------
xccui commented on a change in pull request #6407: [FLINK-9877][docs] Add
documentation page for different datastream joins
URL: https://github.com/apache/flink/pull/6407#discussion_r205175476
##########
File path: docs/dev/stream/operators/joining.md
##########
@@ -0,0 +1,286 @@
+---
+title: "Joining"
+nav-id: streaming_joins
+nav-show_overview: true
+nav-parent_id: streaming
+nav-pos: 10
+---
+<!--
+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.
+-->
+
+* toc
+{:toc}
+
+# Window Join
+A window join will join the elements of two streams that share a common key
and lie in the same window. These windows can be defined by using a [window
assigner]({{ site.baseurl}}/dev/stream/operators/windows.html#window-assigners)
and are evaluated on a union of both streams. This is especially important for
session window joins, which will be demonstrated below.
Review comment:
A window join **joins** elements of two streams that share a common key and
lie in the same window. These windows can be defined with a window assigner and
are evaluated on **elements from both of the streams**. ~~This is especially
important for session window joins, which will be demonstrated below.~~
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> Add separate docs page for different join types in DataStream API
> -----------------------------------------------------------------
>
> Key: FLINK-9877
> URL: https://issues.apache.org/jira/browse/FLINK-9877
> Project: Flink
> Issue Type: Sub-task
> Components: Documentation
> Reporter: Florian Schmidt
> Assignee: Florian Schmidt
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.6.0
>
>
> https://github.com/apache/flink/pull/6407
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