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https://issues.apache.org/jira/browse/SPARK-20440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981744#comment-15981744
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Vinayak Joshi commented on SPARK-20440:
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The PR comments include a workaround for this need such that SparkR code
doesn't have to be changed.
> Allow SparkR session and context to have delayed binding
> --------------------------------------------------------
>
> Key: SPARK-20440
> URL: https://issues.apache.org/jira/browse/SPARK-20440
> Project: Spark
> Issue Type: Improvement
> Components: SparkR
> Affects Versions: 2.1.0
> Reporter: Vinayak Joshi
>
> It would be useful if users could do something like this without first
> invoking {{sparkR.session()}}:
> {code}
> delayedAssign(".sparkRsession", { sparkR.session(..) },
> assign.env=SparkR:::.sparkREnv)
> {code}
> This would help providers of interactive environments that bootstrap Spark
> for their users but where, the user code need not always include SparkR. So
> the possibility of lazy semantics for setting up a SparkSession/Context would
> be very useful.
> Note that SparkR API does not have a single entry object (such as
> Scala/Python SparkSession classes) so it's the only env where such lazy setup
> is currently difficult to achieve, so doing this enhancement will make it
> easier.
> The changes required are minor and do not affect the external API or
> functionality in any way. I will attach a PR with the changes needed for
> consideration shortly.
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