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https://issues.apache.org/jira/browse/FLINK-6930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16051581#comment-16051581
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ASF GitHub Bot commented on FLINK-6930:
---------------------------------------
Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/4133
Thanks for the fix @wuchong!
I would adjust the error message as proposed but otherwise it's good to
merge.
Thanks, Fabian
> Selecting window start / end on row-based Tumble/Slide window causes NPE
> ------------------------------------------------------------------------
>
> Key: FLINK-6930
> URL: https://issues.apache.org/jira/browse/FLINK-6930
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.3.0, 1.4.0
> Reporter: Fabian Hueske
> Assignee: Jark Wu
>
> Selecting the start and end properties of a row-based window causes a
> NullPointerException.
> The following program:
> {code}
> val windowedTable = table
> .window(Tumble over 2.rows on 'proctime as 'w)
> .groupBy('w, 'string)
> .select('string as 'n, 'int.count as 'cnt, 'w.start as 's, 'w.end as 'e)
> {code}
> causes
> {code}
> Caused by: java.lang.NullPointerException
> at
> org.apache.calcite.runtime.SqlFunctions.toLong(SqlFunctions.java:1556)
> at
> org.apache.calcite.runtime.SqlFunctions.toLong(SqlFunctions.java:1551)
> at DataStreamCalcRule$40.processElement(Unknown Source)
> at
> org.apache.flink.table.runtime.CRowProcessRunner.processElement(CRowProcessRunner.scala:67)
> at
> org.apache.flink.table.runtime.CRowProcessRunner.processElement(CRowProcessRunner.scala:35)
> at
> org.apache.flink.streaming.api.operators.ProcessOperator.processElement(ProcessOperator.java:66)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:528)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:503)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:483)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:890)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:868)
> at
> org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:51)
> at
> org.apache.flink.table.runtime.aggregate.IncrementalAggregateWindowFunction.apply(IncrementalAggregateWindowFunction.scala:75)
> at
> org.apache.flink.table.runtime.aggregate.IncrementalAggregateWindowFunction.apply(IncrementalAggregateWindowFunction.scala:37)
> at
> org.apache.flink.streaming.runtime.operators.windowing.functions.InternalSingleValueWindowFunction.process(InternalSingleValueWindowFunction.java:46)
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.emitWindowContents(WindowOperator.java:599)
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.processElement(WindowOperator.java:456)
> at
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:207)
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:69)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:265)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:702)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> We should validate that the start and end window properties are not accessed
> if the window is defined on row-counts.
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