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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-6584) Support multiple consecutive windows in SQL
Date Fri, 30 Jun 2017 08:30:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-6584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16069696#comment-16069696
] 

ASF GitHub Bot commented on FLINK-6584:
---------------------------------------

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

    https://github.com/apache/flink/pull/4199#discussion_r124988636
  
    --- Diff: flink-libraries/flink-table/src/main/java/org/apache/calcite/sql/fun/SqlStdOperatorTable.java
---
    @@ -1900,7 +1900,7 @@ public void unparse(
     		new SqlGroupFunction(SqlKind.TUMBLE, null,
     			OperandTypes.or(OperandTypes.DATETIME_INTERVAL,
     				OperandTypes.DATETIME_INTERVAL_TIME)) {
    -			@Override List<SqlGroupFunction> getAuxiliaryFunctions() {
    +			@Override public List<SqlGroupFunction> getAuxiliaryFunctions() {
    --- End diff --
    
    As I mentioned in the PR description: "We need to get the visibility changes that I made
in Calcite in the next Calcite release." Right now it is not possible to add custom SqlGroupFunctions.


> Support multiple consecutive windows in SQL
> -------------------------------------------
>
>                 Key: FLINK-6584
>                 URL: https://issues.apache.org/jira/browse/FLINK-6584
>             Project: Flink
>          Issue Type: New Feature
>          Components: Table API & SQL
>            Reporter: Timo Walther
>            Assignee: Timo Walther
>
> Right now, the Table API supports multiple consecutive windows as follows:
> {code}
> val table = stream.toTable(tEnv, 'rowtime.rowtime, 'int, 'double, 'float, 'bigdec, 'string)
> val t = table
>   .window(Tumble over 2.millis on 'rowtime as 'w)
>   .groupBy('w)
>   .select('w.rowtime as 'rowtime, 'int.count as 'int)
>   .window(Tumble over 4.millis on 'rowtime as 'w2)
>   .groupBy('w2)
>   .select('w2.rowtime, 'w2.end, 'int.count)
> {code}
> Similar behavior should be supported by the SQL API as well. We need to introduce a new
auxiliary group function, but this should happen in sync with Apache Calcite.



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