viirya commented on code in PR #1566:
URL: https://github.com/apache/arrow-rs/pull/1566#discussion_r851351693
##########
arrow/src/datatypes/field.rs:
##########
@@ -116,14 +116,25 @@ impl Field {
/// Returns a (flattened) vector containing all fields contained within
this field (including it self)
pub(crate) fn fields(&self) -> Vec<&Field> {
let mut collected_fields = vec![self];
- match &self.data_type {
+ collected_fields.append(&mut self._fields(&self.data_type));
+
+ collected_fields
+ }
+
+ fn _fields<'a>(&'a self, dt: &'a DataType) -> Vec<&Field> {
+ let mut collected_fields = vec![];
+
+ match dt {
DataType::Struct(fields) | DataType::Union(fields, _) => {
collected_fields.extend(fields.iter().flat_map(|f| f.fields()))
}
DataType::List(field)
| DataType::LargeList(field)
| DataType::FixedSizeList(field, _)
| DataType::Map(field, _) => collected_fields.push(field),
+ DataType::Dictionary(_, value_field) => {
+ collected_fields.append(&mut
self._fields(value_field.as_ref()))
Review Comment:
Yea, this is key part here to get fields inside dictionary type.
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