[C++] Add tests for HalfFloatScalar

[pitrou]

Describe the enhancement requested

We have this long-standing TODO in scalar_test.cc that we should be able to address now that we have better float16 support in the library:

arrow/cpp/src/arrow/scalar_test.cc

Line 1174 in 85b4e6d

// TODO test HalfFloatScalar

Component(s)

C++

[pitrou]

@dinse I don't know if you're interested in this.

[dinse]

I added HalfFloatType to the params for TestRealScalar. Then, the equality comparisons fail for NaN and 0/-0, which I think is related to #46739.

[andishgar]

Describe the enhancement requested

We have this long-standing TODO in scalar_test.cc that we should be able to address now that we have better float16 support in the library:

arrow/cpp/src/arrow/scalar_test.cc

Line 1174 in 85b4e6d

// TODO test HalfFloatScalar

Component(s)

C++

@pitrou While working on this pull request, I realized that there are no such tests for Array, ChunkedArray, RecordBatch, or Table .

[benibus]

This is potentially handled in #46973 (along with the Array tests).

[github-actions]

This issue has been marked as stale because it has had no activity in the past 365 days. Please remove the stale label or comment below, or this issue will be closed in 14 days. If this improvement is still desired but has no current owner, please add the 'Status: needs champion' label.