HyukjinKwon opened a new pull request #28908:
URL: https://github.com/apache/spark/pull/28908
### What changes were proposed in this pull request?
Spark 3.0 accidentally dropped R < 3.5. It is built by R 3.6.3 which not
support R < 3.5:
{code}
Error in readRDS(pfile) : cannot read workspace version 3 written by R
3.6.3; need R 3.5.0 or newer version.
{code}
In fact, with SPARK-31918, we will have to drop R < 3.5 entirely to support
R 4.0.0. This is inevitable to release on CRAN because they require to make the
tests pass with the latest R.
### Why are the changes needed?
To show the supported versions correctly, and support R 4.0.0 to unblock the
releases.
### Does this PR introduce _any_ user-facing change?
In fact, no because Spark 3.0.0 already does not work with R < 3.5.
Compared to Spark 2.4, yes. R < 3.5 would not work.
### How was this patch tested?
Jenkins should test it out.
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