GitHub user xccui opened a pull request:
https://github.com/apache/flink/pull/5140
[FLINK-7797] [table] Add support for windowed outer joins for streaming
tables
## What is the purpose of the change
This PR adds support for windowed outer joins for streaming tables.
## Brief change log
- Adjusts the plan translation logic to accept stream window outer join.
- Adheres an ever emitted flag to each row. When a row is removed from
the cache (or detected as not cached), a null padding join result will be
emitted if necessary.
- Adds a custom `JoinAwareCollector` to track whether there's a
successfully joined result for both sides in each join loop.
- Adds table/SQL translation tests, and also join integration tests.
Since the runtime logic is built on the existing window inner join, no new
harness tests are added.
- Updates the SQL/Table API docs.
## Verifying this change
This PR can be verified by the cases added in `JoinTest` and `JoinITCase`.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (**yes**)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (**yes**)
- If yes, how is the feature documented? (**removes the restriction
notes**)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/xccui/flink FLINK-7797
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/5140.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #5140
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commit 34d3fde8049ec407849b61901acd8258a6a1f919
Author: Xingcan Cui <xingc...@gmail.com>
Date: 2017-12-07T17:28:40Z
[FLINK-7797] [table] Add support for windowed outer joins for streaming
tables
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