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https://issues.apache.org/jira/browse/FLINK-11136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16718430#comment-16718430
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ASF GitHub Bot commented on FLINK-11136:
----------------------------------------
dianfu opened a new pull request #7284: [FLINK-11136] [table] Fix the merge
logic of DISTINCT aggregates
URL: https://github.com/apache/flink/pull/7284
## What is the purpose of the change
*This pull request fix the merge logic of DISTINCT aggregates.*
## Brief change log
- *Fix the codegen logic in AggregationCodeGenerator to extract the
distinct fields for merge*
## Verifying this change
This change added tests and can be verified as follows:
- *Updated integration tests
SqlITCase#testDistinctAggWithMergeOnEventTimeSessionGroupWindow*
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (no)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (no)
- The serializers: (no)
- The runtime per-record code paths (performance sensitive): (no)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
- The S3 file system connector: (no)
## Documentation
- Does this pull request introduce a new feature? (no)
- If yes, how is the feature documented? (not applicable)
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> Fix the logical of merge for DISTINCT aggregates
> ------------------------------------------------
>
> Key: FLINK-11136
> URL: https://issues.apache.org/jira/browse/FLINK-11136
> Project: Flink
> Issue Type: Test
> Components: Table API & SQL
> Reporter: Dian Fu
> Assignee: Dian Fu
> Priority: Major
> Labels: pull-request-available
>
> The logic of merge for DISTINCT aggregates has bug. For the following query:
> {code:java}
> SELECT
> c,
> COUNT(DISTINCT b),
> SUM(DISTINCT b),
> SESSION_END(rowtime, INTERVAL '0.005' SECOND)
> FROM MyTable
> GROUP BY SESSION(rowtime, INTERVAL '0.005' SECOND), c{code}
> the following exception will be thrown:
> {code:java}
> Caused by: java.lang.ClassCastException: org.apache.flink.types.Row cannot be
> cast to java.lang.Integer
> at scala.runtime.BoxesRunTime.unboxToInt(BoxesRunTime.java:101)
> at scala.math.Numeric$IntIsIntegral$.plus(Numeric.scala:58)
> at
> org.apache.flink.table.functions.aggfunctions.SumAggFunction.accumulate(SumAggFunction.scala:50)
> at GroupingWindowAggregateHelper$18.mergeAccumulatorsPair(Unknown Source)
> at
> org.apache.flink.table.runtime.aggregate.AggregateAggFunction.merge(AggregateAggFunction.scala:66)
> at
> org.apache.flink.table.runtime.aggregate.AggregateAggFunction.merge(AggregateAggFunction.scala:33)
> at
> org.apache.flink.runtime.state.heap.HeapAggregatingState.mergeState(HeapAggregatingState.java:117)
> at
> org.apache.flink.runtime.state.heap.AbstractHeapMergingState$MergeTransformation.apply(AbstractHeapMergingState.java:102)
> at
> org.apache.flink.runtime.state.heap.CopyOnWriteStateTable.transform(CopyOnWriteStateTable.java:463)
> at
> org.apache.flink.runtime.state.heap.CopyOnWriteStateTable.transform(CopyOnWriteStateTable.java:341)
> at
> org.apache.flink.runtime.state.heap.AbstractHeapMergingState.mergeNamespaces(AbstractHeapMergingState.java:91)
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator$2.merge(WindowOperator.java:341)
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator$2.merge(WindowOperator.java:311)
> at
> org.apache.flink.streaming.runtime.operators.windowing.MergingWindowSet.addWindow(MergingWindowSet.java:212)
> at
> org.apache.flink.streaming.runtime.operators.windowing.WindowOperator.processElement(WindowOperator.java:311)
> at
> org.apache.flink.streaming.runtime.io.StreamInputProcessor.processInput(StreamInputProcessor.java:202)
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask.run(OneInputStreamTask.java:105)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:300)
> at org.apache.flink.runtime.taskmanager.Task.run(Task.java:704)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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