ARROW-1875: [Java] Write 64-bit ints as strings in integration test JSON files

[tianchen92]

Related to ARROW-1875.
This is Java side implementation.

[codecov-io]

Codecov Report

Merging #4977 into integration_ints_as_strings will increase coverage by 2.13%.
The diff coverage is n/a.

@@                       Coverage Diff                       @@
##           integration_ints_as_strings    #4977      +/-   ##
===============================================================
+ Coverage                        87.57%   89.71%   +2.13%     
===============================================================
  Files                             1002      667     -335     
  Lines                           142651    98283   -44368     
  Branches                          1418        0    -1418     
===============================================================
- Hits                            124929    88176   -36753     
+ Misses                           17360    10107    -7253     
+ Partials                           362        0     -362

Impacted Files	Coverage Δ
cpp/src/arrow/json/converter.cc	90.05% <0%> (-1.76%)	⬇️
cpp/src/arrow/json/chunked-builder.cc	79.91% <0%> (-1.68%)	⬇️
r/src/recordbatch.cpp
r/R/Table.R
js/src/util/fn.ts
go/arrow/array/bufferbuilder.go
r/src/symbols.cpp
rust/datafusion/src/execution/projection.rs
rust/datafusion/src/execution/filter.rs
rust/arrow/src/csv/writer.rs
... and 328 more

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[wesm]

I'm surprised that the integration tests pass. Is RapidJSON loose about parsing strings to numbers?

[tianchen92]

Also surprised me, I thought it would only pass if all the implementations work is done. Since it not break travis, could we just merge this into master or hold it in integration branch?

[kou]

Why does this pull request target to https://github.com/apache/arrow/tree/integration_ints_as_strings branch instead of master?
Should we use the branch? Can we remove the branch?

[emkornfield]

@kou we thought this change would need coordination between multiple languages. It appears it might not. @tianchen92 do you want to try to make the pull request against master and see if the tests still pass?

[tianchen92]

@kou we thought this change would need coordination between multiple languages. It appears it might not. @tianchen92 do you want to try to make the pull request against master and see if the tests still pass?

I think i will work fine in master, I just opened a new PR #5002, close this one and will reopen if needed.

[kou]

@emkornfield Thanks for the answer. There is no problem if we do this intentionally. I thought that this is caused by error. Because we don't use a branch like this.
Sorry for missing a discussion for this branch usage.