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## What changes were proposed in this pull request?
This PR has 2 key changes. One, we are building source package (aka bundle package) for SparkR which could be released on CRAN. Two, we should include in the official Spark binary distributions SparkR installed from this source package instead (which would have help/vignettes rds needed for those to work when the SparkR package is loaded in R, whereas earlier approach with devtools does not)
But, because of various differences in how R performs different tasks, this PR is a fair bit more complicated. More details below.
This PR also includes a few minor fixes.
### more details
These are the additional steps in make-distribution; please see [here](https://github.com/apache/spark/blob/master/R/CRAN_RELEASE.md) on what's going to a CRAN release, which is now run during make-distribution.sh.
1. package needs to be installed because the first code block in vignettes is `library(SparkR)` without lib path
2. `R CMD build` will build vignettes (this process runs Spark/SparkR code and captures outputs into pdf documentation)
3. `R CMD check` on the source package will install package and build vignettes again (this time from source packaged) - this is a key step required to release R package on CRAN
(will skip tests here but tests will need to pass for CRAN release process to success - ideally, during release signoff we should install from the R source package and run tests)
4. `R CMD Install` on the source package (this is the only way to generate doc/vignettes rds files correctly, not in step # 1)
(the output of this step is what we package into Spark dist and sparkr.zip)
Alternatively,
R CMD build should already be installing the package in a temp directory though it might just be finding this location and set it to lib.loc parameter; another approach is perhaps we could try calling `R CMD INSTALL --build pkg` instead.
But in any case, despite installing the package multiple times this is relatively fast.
Building vignettes takes a while though.
## How was this patch tested?
Manually, CI.
Author: Felix Cheung <felixcheung_m@hotmail.com>
Closes #16014 from felixcheung/rdist.
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