Vinayak Joshi created SPARK-20440:
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Summary: 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 the user code need not always include SparkR and so 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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