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https://issues.apache.org/jira/browse/FLINK-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15904707#comment-15904707
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ASF GitHub Bot commented on FLINK-5954:
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Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3461
Thanks for the PR @haohui.
Looks good to me. +1 to merge
> Always assign names to the window in the Stream SQL API
> -------------------------------------------------------
>
> Key: FLINK-5954
> URL: https://issues.apache.org/jira/browse/FLINK-5954
> Project: Flink
> Issue Type: Improvement
> Reporter: Haohui Mai
> Assignee: Haohui Mai
>
> CALCITE-1603 and CALCITE-1615 brings in supports for {{TUMBLE}}, {{HOP}},
> {{SESSION}} grouped windows, as well as the corresponding auxiliary functions
> that allow uses to query the start and the end of the windows (e.g.,
> {{TUMBLE_START()}} and {{TUMBLE_END()}} see
> http://calcite.apache.org/docs/stream.html for more details).
> The goal of this jira is to add support for these auxiliary functions in
> Flink. Flink already has runtime supports for them, as these functions are
> essential mapped to the {{WindowStart}} and {{WindowEnd}} classes.
> To implement this feature in transformation, the transformation needs to
> recognize these functions and map them to the {{WindowStart}} and
> {{WindowEnd}} classes.
> The problem is that both classes can only refer to the windows using alias.
> Therefore this jira proposes to assign a unique name for each window to
> enable the transformation.
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