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https://issues.apache.org/jira/browse/FLINK-6368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15983234#comment-15983234
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ASF GitHub Bot commented on FLINK-6368:
---------------------------------------
Github user shaoxuan-wang commented on the issue:
https://github.com/apache/flink/pull/3768
I ran into the same problem today when adding the new test cases for UDAGG.
Thanks for the fix, @xccui
> Grouping keys in stream aggregations have wrong order
> -----------------------------------------------------
>
> Key: FLINK-6368
> URL: https://issues.apache.org/jira/browse/FLINK-6368
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Timo Walther
> Assignee: Xingcan Cui
> Fix For: 1.3.0
>
>
> FLINK-5768 removed the `AggregateUtil.createPrepareMapFunction` stage. It
> seems that the order of grouping keys is sometimes messed up. The following
> tests fails:
> {code}
> @Test
> def testEventTimeSlidingGroupWindow(): Unit = {
> val env = StreamExecutionEnvironment.getExecutionEnvironment
> env.setStreamTimeCharacteristic(TimeCharacteristic.EventTime)
> val tEnv = TableEnvironment.getTableEnvironment(env)
> StreamITCase.testResults = mutable.MutableList()
> val stream = env
> .fromCollection(data)
> .assignTimestampsAndWatermarks(new TimestampWithEqualWatermark())
> .map(t => (t._2, t._6))
> val table = stream.toTable(tEnv, 'int, 'string)
> val windowedTable = table
> .window(Slide over 10.milli every 5.milli on 'rowtime as 'w)
> .groupBy('w, 'string)
> .select('string, 'int.count, 'w.start, 'w.end)
> val results = windowedTable.toDataStream[Row]
> results.addSink(new StreamITCase.StringSink)
> env.execute()
> }
> {code}
> Exception:
> {code}
> Caused by: java.lang.RuntimeException: Could not forward element to next
> operator
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.pushToOperator(OperatorChain.java:532)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:505)
> at
> org.apache.flink.streaming.runtime.tasks.OperatorChain$CopyingChainingOutput.collect(OperatorChain.java:485)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:871)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator$CountingOutput.collect(AbstractStreamOperator.java:849)
> at
> org.apache.flink.streaming.api.operators.TimestampedCollector.collect(TimestampedCollector.java:51)
> at
> org.apache.flink.table.runtime.aggregate.TimeWindowPropertyCollector.collect(TimeWindowPropertyCollector.scala:50)
> at
> org.apache.flink.table.runtime.aggregate.TimeWindowPropertyCollector.collect(TimeWindowPropertyCollector.scala:29)
> at
> org.apache.flink.table.runtime.aggregate.IncrementalAggregateWindowFunction.apply(IncrementalAggregateWindowFunction.scala:74)
> at
> org.apache.flink.table.runtime.aggregate.IncrementalAggregateTimeWindowFunction.apply(IncrementalAggregateTimeWindowFunction.scala:64)
> at
> org.apache.flink.table.runtime.aggregate.IncrementalAggregateTimeWindowFunction.apply(IncrementalAggregateTimeWindowFunction.scala:35)
> at
> org.apache.flink.streaming.runtime.operators.windowing.functions.InternalSingleValueWindowFunction.process(InternalSingleValueWindowFunction.java:45)
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.emitWindowContents(WindowOperator.java:598)
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.onEventTime(WindowOperator.java:505)
> at
> org.apache.flink.streaming.api.operators.HeapInternalTimerService.advanceWatermark(HeapInternalTimerService.java:276)
> at
> org.apache.flink.streaming.api.operators.InternalTimeServiceManager.advanceWatermark(InternalTimeServiceManager.java:119)
> at
> org.apache.flink.streaming.api.operators.AbstractStreamOperator.processWatermark(AbstractStreamOperator.java:940)
> at
> org.apache.flink.streaming.runtime.io.StreamInputProcessor$ForwardingValveOutputHandler.handleWatermark(StreamInputProcessor.java:288)
> ... 7 more
> Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to
> java.lang.String
> {code}
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