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https://issues.apache.org/jira/browse/FLINK-20747?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17275506#comment-17275506
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charlieme commented on FLINK-20747:
-----------------------------------
What's the problem with Flink after it's taken over by Alibaba.
Bugs ,disordered type systems and plans.
Shouldn't it be tested?
> ClassCastException when using MAX aggregate function
> ----------------------------------------------------
>
> Key: FLINK-20747
> URL: https://issues.apache.org/jira/browse/FLINK-20747
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.12.0
> Reporter: zengjinbo
> Priority: Critical
> Fix For: 1.12.2, 1.13.0
>
> Attachments: image-2020-12-23-18-04-21-079.png
>
>
> During the process of upgrading 1.12.0, I found that Flink SQL 1.11.1 is not
> compatible
> java.lang.ClassCastException: java.lang.Integer cannot be cast to
> org.apache.flink.table.data.StringDatajava.lang.ClassCastException:
> java.lang.Integer cannot be cast to org.apache.flink.table.data.StringData at
> org$apache$flink$table$planner$functions$aggfunctions$MaxWithRetractAggFunction$MaxWithRetractAccumulator$Converter.toInternal(Unknown
> Source) at
> org.apache.flink.table.data.conversion.StructuredObjectConverter.toInternal(StructuredObjectConverter.java:92)
> at
> org.apache.flink.table.data.conversion.StructuredObjectConverter.toInternal(StructuredObjectConverter.java:47)
> at
> org.apache.flink.table.data.conversion.DataStructureConverter.toInternalOrNull(DataStructureConverter.java:59)
> at GroupAggsHandler$875.getAccumulators(Unknown Source) at
> org.apache.flink.table.runtime.operators.aggregate.GroupAggFunction.processElement(GroupAggFunction.java:175)
> at
> org.apache.flink.table.runtime.operators.aggregate.GroupAggFunction.processElement(GroupAggFunction.java:45)
> at
> org.apache.flink.streaming.api.operators.KeyedProcessOperator.processElement(KeyedProcessOperator.java:85)
> at
> org.apache.flink.streaming.runtime.tasks.OneInputStreamTask$StreamTaskNetworkOutput.emitRecord(OneInputStreamTask.java:193)
> at
> org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.processElement(StreamTaskNetworkInput.java:179)
> at
> org.apache.flink.streaming.runtime.io.StreamTaskNetworkInput.emitNext(StreamTaskNetworkInput.java:152)
> at
> org.apache.flink.streaming.runtime.io.StreamOneInputProcessor.processInput(StreamOneInputProcessor.java:67)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.processInput(StreamTask.java:372)
> at
> org.apache.flink.streaming.runtime.tasks.mailbox.MailboxProcessor.runMailboxLoop(MailboxProcessor.java:186)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.runMailboxLoop(StreamTask.java:575)
> at
> org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:539)
> at org.apache.flink.runtime.taskmanager.Task.doRun(Task.java:722) at
> org.apache.flink.runtime.taskmanager.Task.run(Task.java:547)
>
>
> !image-2020-12-23-18-04-21-079.png!
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