wesm opened a new pull request #7278:
URL: https://github.com/apache/arrow/pull/7278
There's some new code generation machinery here (that will be worth ongoing
iteration) but the relevant implementation / "developer UX" is what's in
string_scalar_ascii.cc, take a look.
```
In [1]: import pyarrow as pa; import pyarrow.compute as pc
In [2]: arr = pa.array(['aaa', 'bbbbbb', None, ''])
In [3]: pc.ascii_upper(arr)
Out[3]:
<pyarrow.lib.StringArray object at 0x7f7044003e50>
[
"AAA",
"BBBBBB",
null,
""
]
In [4]: pc.ascii_length(arr)
Out[4]:
<pyarrow.lib.Int32Array object at 0x7f7044003910>
[
3,
6,
null,
0
]
```
int64 offsets are respected with LargeString
```
In [5]: arr = pa.array(['aaa', 'bbbbbb', None, ''], type='large_utf8')
In [6]: pc.ascii_length(arr)
Out[6]:
<pyarrow.lib.Int64Array object at 0x7f703c74cbb0>
[
3,
6,
null,
0
]
```
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