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https://issues.apache.org/jira/browse/SPARK-22503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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wangsan resolved SPARK-22503.
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Resolution: Not A Problem
> Using current processing time to generate windows in streaming processing
> -------------------------------------------------------------------------
>
> Key: SPARK-22503
> URL: https://issues.apache.org/jira/browse/SPARK-22503
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 2.2.0, 2.3.0
> Reporter: wangsan
> Priority: Major
>
> There are cases we want to use processing time to generate windows in stream
> processing, but `current_timestamp()` are not allowed in `window()` function
> now.
> When using `current_timestamp` in `window` function, the exception tells
> "nondeterministic expressions are only allowed in Project, Filter, Aggregate
> or Window".
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