ARROW-5361: [R] Follow DictionaryType/DictionaryArray changes from ARROW-3144

[romainfrancois]

At the moment however, all the DictionaryMemo use is internal, it should probably be promoted to arguments (with defaults) to the R functions.

I'll do this here or on another PR if this one is merged first so that r/ builds again on travis.

This now needs the C++ lib up to date, e.g. on my setup I get it through brew install apache-arrow --HEAD, and there is no conditional compiling so that it still works with previous versions. Let me know if that's ok.

follow up from #4316

[nealrichardson]

This failed on Travis: https://travis-ci.org/apache/arrow/jobs/539085011#L3842-L3854

So,

1. Looks like that may be fixed by running devtools::document() since you did update the inline docs
2. Please remove the allow_failures from .travis.yml since R is now expected to pass: https://github.com/apache/arrow/blob/master/.travis.yml#L50-L51

Otherwise, once Travis is truly green again, LGTM.

[wesm]

@romainfrancois can you remove R from the allow_failures section of Travis CI?

https://github.com/apache/arrow/blob/master/.travis.yml#L50

[romainfrancois]

I'm currently getting errors on travis that don't seem related to r/ I guess the R job needs some attention.

[nealrichardson]

It's not you, it's https://issues.apache.org/jira/browse/ARROW-5470. I'm poking at a few things now to see if I can resolve it.

[nealrichardson]

Ok @romainfrancois #4443 is in master now so if you merge/rebase, this should pass 🤞

[codecov-io]

Codecov Report

Merging #4413 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4413      +/-   ##
==========================================
- Coverage   88.41%   88.41%   -0.01%     
==========================================
  Files         793      792       -1     
  Lines      101335   101217     -118     
  Branches     1253     1251       -2     
==========================================
- Hits        89598    89486     -112     
+ Misses      11490    11483       -7     
- Partials      247      248       +1

Impacted Files	Coverage Δ
cpp/src/parquet/properties.h	94.95% <0%> (-1.48%)	⬇️
go/arrow/ipc/writer.go	76.56% <0%> (-1.4%)	⬇️
cpp/src/arrow/util/io-util.cc	74.82% <0%> (-1.35%)	⬇️
js/src/ipc/metadata/message.ts	92.99% <0%> (-1.28%)	⬇️
go/arrow/ipc/file_reader.go	59.64% <0%> (-1.08%)	⬇️
js/src/schema.ts	88.77% <0%> (-1.03%)	⬇️
cpp/src/arrow/flight/test-util.cc	88.72% <0%> (-0.84%)	⬇️
cpp/src/arrow/python/flight.cc	87.69% <0%> (-0.77%)	⬇️
cpp/src/arrow/flight/server.cc	90.06% <0%> (-0.54%)	⬇️
cpp/src/parquet/arrow/writer.cc	96.44% <0%> (-0.5%)	⬇️
... and 70 more

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