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https://issues.apache.org/jira/browse/SPARK-35767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dongjoon Hyun updated SPARK-35767:
----------------------------------
Affects Version/s: 3.2.0
> [SQL] CoalesceExec can execute child plan twice
> -----------------------------------------------
>
> Key: SPARK-35767
> URL: https://issues.apache.org/jira/browse/SPARK-35767
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.2, 3.1.2, 3.2.0
> Reporter: Andy Grove
> Priority: Minor
>
> CoalesceExec calls `child.execute()` in the if condition and throws away the
> results, then calls `child.execute()` again in the else condition. This could
> cause a section of the plan to be executed twice.
> {code:java}
> protected override def doExecute(): RDD[InternalRow] = {
> if (numPartitions == 1 && child.execute().getNumPartitions < 1) {
> // Make sure we don't output an RDD with 0 partitions, when claiming that
> we have a
> // `SinglePartition`.
> new CoalesceExec.EmptyRDDWithPartitions(sparkContext, numPartitions)
> } else {
> child.execute().coalesce(numPartitions, shuffle = false)
> }
> } {code}
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