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https://issues.apache.org/jira/browse/SPARK-22238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16199451#comment-16199451
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Apache Spark commented on SPARK-22238:
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User 'brkyvz' has created a pull request for this issue:
https://github.com/apache/spark/pull/19467
> EnsureStatefulOpPartitioning shouldn't ask for the child RDD before planning
> is completed
> -----------------------------------------------------------------------------------------
>
> Key: SPARK-22238
> URL: https://issues.apache.org/jira/browse/SPARK-22238
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.3.0
> Reporter: Burak Yavuz
> Assignee: Burak Yavuz
>
> In EnsureStatefulOpPartitioning, we check that the inputRDD to a SparkPlan
> has the expected partitioning for Streaming Stateful Operators. The problem
> is that we are not allowed to access this information during planning.
> The reason we added that check was because CoalesceExec could actually create
> RDDs with 0 partitions. We should fix it such that when CoalesceExec says
> that there is a SinglePartition, there is in fact an inputRDD of 1 partition
> instead of 0 partitions.
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