GitHub user xccui opened a pull request:
https://github.com/apache/flink/pull/4934
[FLINK-7800] [table] Enable window joins without equi-join predicates
## What is the purpose of the change
This PR enables the stream window joins without equi-join predicates.
## Brief change log
- Push down all the predicate checks from `FlinkLogicalRule` to
DataSet/DataStream rules so that we can organise them in a flat mode.
- Create a `JoinPlanUtil` tool to provide utilities (e.g., equi-predicate
checker) for join plan translation.
- Give priority to join plans with equi-join predicates by subtracting 1
from the IO cost.
- Add related tests.
- Update the documents.
## Verifying this change
This change can be verified by the added tests 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**)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (docs)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/xccui/flink FLINK-7800
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/4934.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 #4934
----
commit 2ec1571475214e16eae54e69d4b5beb88a8b6fdc
Author: Xingcan Cui <[email protected]>
Date: 2017-10-27T03:11:21Z
[FLINK-7800] [table] Enable window joins without equi-join predicates
----
---
