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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6228) Integrating the OVER windows in the Table API
Date Thu, 20 Apr 2017 22:11:06 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6228?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15977677#comment-15977677
] 

ASF GitHub Bot commented on FLINK-6228:
---------------------------------------

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3743#discussion_r112570409
  
    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/OverAggregate.scala
---
    @@ -23,7 +23,9 @@ import org.apache.calcite.rel.`type`.{RelDataType, RelDataTypeFieldImpl}
     import org.apache.calcite.rel.core.AggregateCall
     import org.apache.calcite.rel.core.Window.Group
     import org.apache.calcite.rel.core.Window
    -import org.apache.calcite.rex.{RexInputRef}
    +import org.apache.calcite.rex.{RexInputRef, RexLiteral}
    --- End diff --
    
    All these changes could be undone if we don't use a literal for the orderBy() expression


> Integrating the OVER windows in the Table API
> ---------------------------------------------
>
>                 Key: FLINK-6228
>                 URL: https://issues.apache.org/jira/browse/FLINK-6228
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API & SQL
>            Reporter: sunjincheng
>            Assignee: sunjincheng
>
> Syntax:
> {code}
> table
>    .overWindows(
>     (Rows|Range [ partitionBy value_expression , ... [ n ]] [ orderBy order_by_expression]

>       (preceding  UNBOUNDED|value_specification.(rows|milli|second|minute|hour|day|month|year)|CURRENTROW)
>      [following UNBOUNDED|value_specification.(rows|milli|second|minute|hour|day|month|year)|CURRENTROW]
>     as alias,...[n])
>    )
>   .select( [col1,...[n]], (agg(col1) OVER overWindowAlias, … [n])
> {code}
> Implement restrictions:
> * All OVER clauses in the same SELECT clause must be exactly the same.
> * The PARTITION BY clause is optional (no partitioning results in single threaded execution).
> * The ORDER BY Before the [FLINK-5884|https://issues.apache.org/jira/browse/FLINK-5884]
 implementation orderBy may only have ‘rowtime/’proctime(for stream)/‘specific-time-field(for
batch).
> * FOLLOWING is not supported.
> User interface design document [See | https://docs.google.com/document/d/13Z-Ovx3jwtmzkSweJyGkMy751BouhuJ29Y1CTNZt2DI/edit#]



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