ARROW-5119: [Go] fix Boolean stringer implementation

[sbinet]

No description provided.

[codecov-io]

Codecov Report

Merging #4112 into master will decrease coverage by 18.65%.
The diff coverage is 0%.

@@ Coverage Diff @@## master #4112 +/- ##
===========================================
- Coverage 87.82% 69.16% -18.66% 
===========================================
Files 739 61 -678 Lines 90965 4206 -86759 Branches 1252 0 -1252 ===========================================
- Hits 79886 2909 -76977 + Misses 10958 1188 -9770 + Partials 121 109 -12

Impacted Files	Coverage Δ
go/arrow/array/boolean.go	48.27% <0%> (ø)	⬆️
go/arrow/math/float64_sse4_amd64.go	0% <0%> (-100%)	⬇️
go/arrow/memory/memory_sse4_amd64.go	0% <0%> (-100%)	⬇️
go/arrow/math/uint64_sse4_amd64.go	0% <0%> (-100%)	⬇️
go/arrow/math/int64_sse4_amd64.go	0% <0%> (-100%)	⬇️
go/arrow/math/uint64_amd64.go	33.33% <0%> (ø)	⬆️
go/arrow/math/int64_amd64.go	33.33% <0%> (ø)	⬆️
go/arrow/math/float64_amd64.go	33.33% <0%> (ø)	⬆️
python/pyarrow/ipc.pxi
cpp/src/arrow/csv/chunker-test.cc
... and 682 more

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[sbinet]

@stuartcarnie@alexandreyc PTAL

[alexandreyc]

Good catch!

LGTM

[wesm]

This is not tested I guess?

[sbinet]

this was, but the array was - by shear luck - of the correct size.
I'll modify an example/test to exercize it.

[stuartcarnie]

Looks good!

[sbinet]

@wesm: added the test as part of #4114