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https://issues.apache.org/jira/browse/SPARK-27850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16850280#comment-16850280
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Hyukjin Kwon commented on SPARK-27850:
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They are under execution package which is meant to be private.
> Make SparkPlan#doExecuteBroadcast public
> ----------------------------------------
>
> Key: SPARK-27850
> URL: https://issues.apache.org/jira/browse/SPARK-27850
> Project: Spark
> Issue Type: Improvement
> Components: Optimizer, Spark Core, SQL
> Affects Versions: 2.4.3
> Reporter: Marc Arndt
> Priority: Major
>
> The handling of broadcasts of SparkPlan objects is handled inside the
> SparkPlan#executeBroadcast method. According to the documentation of
> SparkPlan to provide custom broadcast functionality the `doExecuteBroadcast`
> method should be overriden as indicated by the comment:
> {code:scala}
> /**
> * Returns the result of this query as a broadcast variable by delegating
> to `doExecuteBroadcast`
> * after preparations.
> *
> * Concrete implementations of SparkPlan should override
> `doExecuteBroadcast`.
> */
> final def executeBroadcast[T](): broadcast.Broadcast[T] = executeQuery {
> if (isCanonicalizedPlan) {
> throw new IllegalStateException("A canonicalized plan is not supposed
> to be executed.")
> }
> doExecuteBroadcast()
> }
> {code}
> When looking at the definition of SparkPlan#doExecuteBroadcast:
> {code:scala}
> /**
> * Produces the result of the query as a broadcast variable.
> *
> * Overridden by concrete implementations of SparkPlan.
> */
> protected[sql] def doExecuteBroadcast[T](): broadcast.Broadcast[T] = {
> throw new UnsupportedOperationException(s"$nodeName does not implement
> doExecuteBroadcast")
> }
> {code}
> it becomes apparent that it is not possible to override the method from
> user-defined SparkPlan implementations, because the method has been defined
> as package protected.
> To allow custom SparkPlan implementations to provide their own broadcast
> operations I ask to change the SparkPlan#doExecuteBroadcast to be a public
> method, so that all SparkPlan implementations, independent of the package
> they belong to, can override it.
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