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https://issues.apache.org/jira/browse/FLINK-10686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16679755#comment-16679755
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ASF GitHub Bot commented on FLINK-10686:
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xueyumusic opened a new pull request #7059: [FLINK-10686][table] Port UDFs in
Table API extension points to flink-table-common
URL: https://github.com/apache/flink/pull/7059
## What is the purpose of the change
This PR tries to port UDFs interfaces of TableApi extension points to
flink-table-common in java. Right now it ports UserDefinedFunction,
ScalarFunction, TableFunction, AggregateFunction, DistinctAggregateFunction in
org.apache.flink.table.functions execpt FunctionService and
TemporalTableFunction. FunctionService and TemporalTableFunction may be could
be ported following.
## Brief change log
*(for example:)*
- *port several scala file in org.apache.flink.table.functions to java *
## Verifying this change
This change is a code refactor with existed tests.
## 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): (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? (no)
- If yes, how is the feature documented? (not documented)
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> Introduce a flink-table-common module
> -------------------------------------
>
> Key: FLINK-10686
> URL: https://issues.apache.org/jira/browse/FLINK-10686
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Affects Versions: 1.7.0
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.8.0
>
>
> Because more and more table factories for connectors and formats are added
> and external catalog support is also on the horizon, {{flink-table}} becomes
> a dependency for many Flink modules. Since {{flink-table}} is implemented in
> Scala it requires other modules to be suffixes with Scala prefixes. However,
> as we have learned in the past, Scala code is hard to maintain which is why
> our long-term goal is to avoid Scala/Scala dependencies.
> Therefore we propose a new module {{flink-table-common}} that contains
> interfaces between {{flink-table}} and other modules. This module is
> implemented in Java and should contain minimal (or better no) external
> dependencies.
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