jorisvandenbossche opened a new issue, #39635:
URL: https://github.com/apache/arrow/issues/39635
### Describe the bug, including details regarding any error messages,
version, and platform.
Not a C++ reproducer, but with very preliminary (non-merged) Python bindings
to illustrate it:
```
builder = pa.lib.StringViewBuilder()
builder.append("test")
builder.append("very long string that is not inlined")
builder.append(None)
builder.append("test")
>>> arr = builder.finish()
>>> arr
<pyarrow.lib.Array object at 0x7f9a2e1fc4c0>
[
"test",
"very long string that is not inlined",
null,
"test"
]
>>> arr.type
DataType(string_view)
```
Calculating the `unique` values of this array includes the missing value as
an empty string:
```
>>> arr.unique()
<pyarrow.lib.Array object at 0x7f9a2e45fe20>
[
"test",
"very long string that is not inlined",
""
]
```
I didn't check in the code, but I _assume_ that it's "just" missing the
validity bitmap (the empty string being the value that would otherwise be
masked).
### Component(s)
C++
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