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https://issues.apache.org/jira/browse/FLINK-10676?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16665968#comment-16665968
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ASF GitHub Bot commented on FLINK-10676:
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hequn8128 opened a new pull request #6949: [FLINK-10676][table] Add 'as' method
for OverWindowWithOrderBy
URL: https://github.com/apache/flink/pull/6949
## What is the purpose of the change
The preceding clause of OVER Window in the traditional database is optional.
The default is UNBOUNDED. So we can add the `as` method to
`OverWindowWithOrderBy`. This way OVER Window is written more easily. e.g.:
`.window(Over partitionBy 'c orderBy 'proctime preceding UNBOUNDED_ROW as
'w)`
Can be simplified as follows:
`.window(Over partitionBy 'c orderBy 'proctime as 'w)`
SQL has already supported such feature.
## Brief change log
- Add `as` function for `OverWindowWithOrderBy` both for scala and java.
- Add tests to check result plan.
## Verifying this change
This change added tests and can be verified as follows:
- Added tests that validate result plan, such as tests in `OverWindowTest`
and `OverWindowStringExpressionTest`.
## 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)`: (yes)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- 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? (docs)
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> Add 'as' method for OverWindowWithOrderBy in Java API
> -----------------------------------------------------
>
> Key: FLINK-10676
> URL: https://issues.apache.org/jira/browse/FLINK-10676
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.7.0
> Reporter: sunjincheng
> Assignee: Hequn Cheng
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.7.0
>
>
> The preceding clause of OVER Window in the traditional database is optional.
> The default is UNBOUNDED. So we can add the "as" method to
> OverWindowWithOrderBy. This way OVERWindow is written more easily. e.g.:
> {code:java}
> .window(Over partitionBy 'c orderBy 'proctime preceding UNBOUNDED_ROW as
> 'w){code}
> Can be simplified as follows:
> {code:java}
> .window(Over partitionBy 'c orderBy 'proctime as 'w){code}
> What do you think?
>
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