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From "sunjincheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-5695) Optimize table type systems based on database semantics
Date Tue, 07 Feb 2017 09:27:41 GMT

    [ https://issues.apache.org/jira/browse/FLINK-5695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15855633#comment-15855633
] 

sunjincheng commented on FLINK-5695:
------------------------------------

Thanks [~fhueske] got your mean. 
I will think about it and reply to you later. :)


> Optimize table type systems based on database semantics
> -------------------------------------------------------
>
>                 Key: FLINK-5695
>                 URL: https://issues.apache.org/jira/browse/FLINK-5695
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>
> Optimize table type systems based on database semantics.As follows:
> {code}
>              groupBy
>          -------------------->
> Table                             GroupedTable
>   ∧   <--------------------           ∧
>    |         select&agg                |
>    |                                           |
>    | where                                |
>    | select                                | groupBy
>    | agg                                   |
>    | ...                                      |
>    |             window                 |
>   ∨     --------------------->     
>  Table                            WindowedTable
>           <---------------------
>               select&over
> {code}
> What do you think? [~fhueske] 



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