klion26 commented on code in PR #9276:
URL: https://github.com/apache/arrow-rs/pull/9276#discussion_r2846363070
##########
parquet-variant/src/path.rs:
##########
@@ -69,11 +69,21 @@ use crate::utils::parse_path;
/// # use parquet_variant::{VariantPath, VariantPathElement};
/// /// You can access the paths using slices
/// // access the field "foo" and then the first element in a variant list
value
-/// let path = VariantPath::from("foo")
+/// let path = VariantPath::try_from("foo").unwrap()
/// .join("bar")
/// .join("baz");
/// assert_eq!(path[1], VariantPathElement::field("bar"));
/// ```
+///
+/// # Example: Accessing filed with bracket
+/// ```
+/// # use parquet_variant::{VariantPath, VariantPathElement};
+/// let path = VariantPath::try_from("a[b.c].d[2]").unwrap();
Review Comment:
currently, `[2]` -> Index, and `['2']` is Path, (relies on
`unescaped.parse()` to determine whether it's index)
The code below will print `VariantPath([Field { name: "'3'"
}]):::VariantPath([Index { index: 3 }])`
```
let path = VariantPath::try_from("[3]").unwrap();
let p = VariantPath::try_from("['3']").unwrap();
println!("{:?}:::{:?}", p, path);
```
2 `a.foo` equals to `a['foo']`, but leading '.'(`.foo`) will throw an error
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