Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/15200
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GitHub user shivaram opened a pull request:
https://github.com/apache/spark/pull/15200
Skip building R vignettes if Spark is not built
## What changes were proposed in this pull request?
When we build the docs separately we don't have the JAR files from the
Spark build in
