Improve integration test document to follow Arrow C++ repo CI

[viirya]

Which issue does this PR close?

Closes #1741.

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

[codecov-commenter]

Codecov Report

Merging #1742 (1a30d42) into master (5cf06bf) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 1a30d42 differs from pull request most recent head 9aa7a0b. Consider uploading reports for the commit 9aa7a0b to get more accurate results

@@            Coverage Diff             @@
##           master    #1742      +/-   ##
==========================================
- Coverage   83.32%   83.31%   -0.01%     
==========================================
  Files         196      196              
  Lines       55961    55961              
==========================================
- Hits        46627    46624       -3     
- Misses       9334     9337       +3     

Impacted Files	Coverage Δ
parquet_derive/src/parquet_field.rs	65.75% <0.00%> (-0.23%)	⬇️
arrow/src/array/transform/mod.rs	86.74% <0.00%> (-0.23%)	⬇️

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[viirya]

cc @alamb

[tustvold]

I'm a little confused why we are documenting what the C++ repo does in the Rust repo? Are you perhaps suggesting we should run with --gold-dirs?

[viirya]

If we want to enable these tests in the C++ repo, we need to pass --gold-dirs test too. Currently although we can pass all producer/consumer tests between C++/Rust according to our doc, it fails --gold-dirs test in C++ repo CI. This update is to reflect this point.

[alamb]

I'm a little confused why we are documenting what the C++ repo does in the Rust repo? Are you perhaps suggesting we should run with --gold-dirs?

The C++ repo is used in the rust repo's CI test:

arrow-rs/.github/workflows/integration.yml

Lines 29 to 35 in 722fcfc

	steps:
	- name: Checkout Arrow
	uses: actions/checkout@v2
	with:
	repository: apache/arrow
	submodules: true
	fetch-depth: 0

[alamb]

Thanks @viirya

[viirya]

Thanks @alamb @tustvold