https://issues.apache.org/jira/browse/ARROW-13113

also deals with:

• https://issues.apache.org/jira/browse/ARROW-12939, closes ARROW-12939: [R] Simplify RTask stop handling #10444
• https://issues.apache.org/jira/browse/ARROW-13114

refactoring the Table$create()and RecordBatch internals to take advantage of altrep when a column is fit for altrep (i.e. at the moment is a double array with no nulls, or an int32 array with no nulls).

Previously altrep was only triggered when converting the arrays.

This is not done in parallel because altrep allocates, but also because at least for these, it's cheap/instant.

@ursabot please benchmark lang=R

Benchmark runs are scheduled for baseline = 998a2a1 and contender = a85e40bfaebac5c59249e9a3dd9b4049828fd932. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Provided benchmark filters do not have any benchmark groups to be executed on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2 (mimalloc)
[Finished ⬇️0.0% ⬆️0.0%] ursa-i9-9960x (mimalloc)
[Skipped ⚠️ Only ['C++'] langs are supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q (mimalloc)

@github-actions crossbow submit -g r

Revision: a0f18640e86ccd4f0ef4a55ece186dc614bc7559

Submitted crossbow builds: ursacomputing/crossbow @ actions-511

Task	Status
conda-linux-gcc-py36-cpu-r40
conda-linux-gcc-py37-cpu-r41
conda-osx-clang-py36-r40
conda-osx-clang-py37-r41
conda-win-vs2017-py36-r40
conda-win-vs2017-py37-r41
homebrew-r-autobrew
test-r-devdocs
test-r-install-local
test-r-linux-as-cran
test-r-linux-rchk
test-r-linux-valgrind
test-r-minimal-build
test-r-rhub-ubuntu-gcc-release-latest
test-r-rocker-r-base-latest
test-r-rstudio-r-base-3.6-bionic
test-r-rstudio-r-base-3.6-centos7-devtoolset-8
test-r-rstudio-r-base-3.6-centos8
test-r-rstudio-r-base-3.6-opensuse15
test-r-rstudio-r-base-3.6-opensuse42
test-r-rtools-35
test-r-version-compatibility
test-r-versions
test-r-without-arrow
test-ubuntu-18.04-r-sanitizer

I have code that deals with https://issues.apache.org/jira/browse/ARROW-13164 on top of this pull request. Can/Should I merge it in here or can this be merged and then I rebase ? @nealrichardson

I have code that deals with https://issues.apache.org/jira/browse/ARROW-13164 on top of this pull request. Can/Should I merge it in here or can this be merged and then I rebase ? @nealrichardson

I think this can be merged and then you rebase for ARROW-13164, but I'll defer to @jonkeane to give the final 👍 and merge here, I've been out all week and haven't been keeping up with everything that's going on.

Thanks @nealrichardson. @jonkeane did you have a chance to review this ?

This looks good to merge. I did noticed there is one benchmark that seemed to have gotten longer (https://conbench.ursa.dev/compare/benchmarks/8cd9415be73542b5b6422f112b82ab6c...7752b1285dea4eb6b4af79a42a191189/). It's possible that won't persist, but if it does we can dig into it and address it in a follow on.