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https://issues.apache.org/jira/browse/FLINK-31424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17700010#comment-17700010
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ZhengYi Weng commented on FLINK-31424:
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Hi,[~jirawech.s] .It seems be a bug caused by that when executing multi sinks,
it will optimize the sinkBlocks with collecting the statistics.But when getting
the window properties of join, join relnode's child are exchanges, their window
properties are null.
> 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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