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https://issues.apache.org/jira/browse/FLINK-11068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16773732#comment-16773732
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sunjincheng commented on FLINK-11068:
-------------------------------------

Hi [~twalthr] for the current JIRA. we do not introduce Java expression, right? 

If so, we need two Table Interface, one is in `api-java` and one is in 
`api-scala`. For Scala user can using both String interface and Expression 
interface, but i am also agree Scala user can only using expression interface.

any thoughts ?

> Convert the API classes *Table, *Window to interfaces
> -----------------------------------------------------
>
>                 Key: FLINK-11068
>                 URL: https://issues.apache.org/jira/browse/FLINK-11068
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: vinoyang
>            Priority: Major
>
> A more detailed description can be found in 
> [FLIP-32|https://cwiki.apache.org/confluence/display/FLINK/FLIP-32%3A+Restructure+flink-table+for+future+contributions].
> This includes: Table, GroupedTable, WindowedTable, WindowGroupedTable, 
> OverWindowedTable, Window, OverWindow
> We can keep the "Table" Scala implementation in a planner module until it has 
> been converted to Java.
> We can add a method to the planner later to give us a concrete instance. This 
> is one possibility to have a smooth transition period instead of changing all 
> classes at once.



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