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https://issues.apache.org/jira/browse/FLINK-31424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17700109#comment-17700109
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ZhengYi Weng commented on FLINK-31424:
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[~jirawech.s] Of course.But I am also new in Flink, the following suggestion
may be completely right.You can clone the repo and repeat the error in the
repo. Then you can try to find where the error is and to fix it. This kind of
issue are mostly about Planner, so you can check the unit test of the Planner.
But It seem that there isn't unit test about this issue. If you don't mind,
could I try to fix it if it is a real bug? And you can have a review. Hoping
that we can make progress together.
> 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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