matthewmturner commented on issue #696:
URL: https://github.com/apache/arrow-rs/issues/696#issuecomment-913013809
@alamb im playing around with the regexp_match function and struggling to
produce the expected results. I tried to do something similar to the test
`match_single_group`.
I have the following:
```
let array = StringArray::from(vec![Some("Animal"), None, Some("House")]);
let pat = StringArray::from(vec![r"^[A]"; 3]);
let m = regexp_match(&array, &pat, None).unwrap();
let result = m.as_any().downcast_ref::<ListArray>().unwrap();
let elem_builder: GenericStringBuilder<i32> = GenericStringBuilder::new(0);
let mut expected_builder = ListBuilder::new(elem_builder);
expected_builder.values().append_value("A").unwrap();
expected_builder.append(true).unwrap();
expected_builder.append(false).unwrap();
expected_builder.append(false).unwrap();
let expected = expected_builder.finish();
assert_eq!(&expected, result);
```
But get the following:
```
thread 'main' panicked at 'assertion failed: `(left == right)`
left: `ListArray
[
StringArray
[
"A",
],
null,
null,
]`,
right: `ListArray
[
StringArray
[
],
null,
null,
]`', src/main.rs:54:5
```
It's not clear to me why the result StringArray at the first index of the
ListArray doesnt have "A" - its just an empty StringArray.
Any thoughts?
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