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https://issues.apache.org/jira/browse/FLINK-3736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15236425#comment-15236425
]
ASF GitHub Bot commented on FLINK-3736:
---------------------------------------
Github user yjshen commented on the pull request:
https://github.com/apache/flink/pull/1870#issuecomment-208661457
The build failure seems unrelated to this PR:
```
[INFO] Compiling 43 source files to
/home/travis/build/apache/flink/flink-libraries/flink-ml/target/classes at
1460411368867
[ERROR] error: error while loading <root>, error in opening zip file
[ERROR] error: scala.reflect.internal.MissingRequirementError: object
scala.runtime in compiler mirror not found.
[ERROR] at
scala.reflect.internal.MissingRequirementError$.signal(MissingRequirementError.scala:16)
[ERROR] at
scala.reflect.internal.MissingRequirementError$.notFound(MissingRequirementError.scala:17)
```
> Move toRexNode and toAggCall logic into Expressions
> ---------------------------------------------------
>
> Key: FLINK-3736
> URL: https://issues.apache.org/jira/browse/FLINK-3736
> Project: Flink
> Issue Type: Improvement
> Components: Table API
> Reporter: Yijie Shen
> Priority: Minor
>
> Since we have a one-to-one mapping from Flink {{Expression}} to Calcite
> {{RexNode}}, and we will implement more and more expressions to make
> flink-table a full-fledged module, I think it's worthwhile to let each
> {{Expression}} take care of its own behaviour on conversion to {{RexNode}}.
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