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https://issues.apache.org/jira/browse/FLINK-31424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17700039#comment-17700039
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jirawech.s commented on FLINK-31424:
------------------------------------
[~zhengyiweng] I see. Thank you so much. Could you mind walk me through how to
start if i want to fix this kind of issue? I am not familiar with Java so much.
I do not know where to start. For example, I can clone the repo and start to
run unit test for Flink Table API? If yes, which unit test i need to check.
> NullPointer when using StatementSet for multiple sinks
> ------------------------------------------------------
>
> Key: FLINK-31424
> URL: https://issues.apache.org/jira/browse/FLINK-31424
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.16.1
> Reporter: jirawech.s
> Priority: Major
> Attachments: HelloFlinkWindowJoin.java
>
>
> I got following error when i tried to execute multiple sinks using
> StatementSet. I am not sure what it is and where to find possible solution.
> Error
> {code:java}
> // code placeholder
> Exception in thread "main" java.lang.NullPointerException
> at
> org.apache.flink.table.planner.plan.metadata.FlinkRelMdWindowProperties.getJoinWindowProperties(FlinkRelMdWindowProperties.scala:373)
> at
> org.apache.flink.table.planner.plan.metadata.FlinkRelMdWindowProperties.getWindowProperties(FlinkRelMdWindowProperties.scala:349)
> at
> GeneratedMetadataHandler_WindowProperties.getWindowProperties_$(Unknown
> Source)
> at GeneratedMetadataHandler_WindowProperties.getWindowProperties(Unknown
> Source)
> at
> org.apache.flink.table.planner.plan.metadata.FlinkRelMetadataQuery.getRelWindowProperties(FlinkRelMetadataQuery.java:261)
> at
> org.apache.flink.table.planner.plan.optimize.StreamCommonSubGraphBasedOptimizer.createIntermediateRelTable(StreamCommonSubGraphBasedOptimizer.scala:287)
> at
> org.apache.flink.table.planner.plan.optimize.StreamCommonSubGraphBasedOptimizer.optimizeBlock(StreamCommonSubGraphBasedOptimizer.scala:138)
> at
> org.apache.flink.table.planner.plan.optimize.StreamCommonSubGraphBasedOptimizer.$anonfun$optimizeBlock$1(StreamCommonSubGraphBasedOptimizer.scala:111)
> at
> org.apache.flink.table.planner.plan.optimize.StreamCommonSubGraphBasedOptimizer.$anonfun$optimizeBlock$1$adapted(StreamCommonSubGraphBasedOptimizer.scala:109)
> at
> scala.collection.mutable.ResizableArray.foreach(ResizableArray.scala:58)
> at
> scala.collection.mutable.ResizableArray.foreach$(ResizableArray.scala:51)
> at
> scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47){code}
> You can test the code, please see the attachment
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