jorgecarleitao commented on pull request #984:
URL: https://github.com/apache/arrow-rs/pull/984#issuecomment-992828156
For reference (for someone not following the gist), a `DictionaryArray` is
essentially
```rust
struct DictionaryArray<K> {
indices: PrimitiveArray<K>
values: Arc<dyn Array>
}
```
that is itemwise represented as `indices.into_iter().map(|optional_index|
optional_index.map(|index| "values[index]"))` where `"values[index]"`
represents the `index` of values.
@alamb 's insight is that we can compare a dictionary with a scalar of the
same (dynamic) type as `values` by comparing `values` with that scalar
(ignoring indices).
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