Fabian Hueske created FLINK-6930:
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Summary: 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
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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