viirya commented on code in PR #1677:
URL: https://github.com/apache/arrow-rs/pull/1677#discussion_r869676095
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arrow/src/datatypes/datatype.rs:
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@@ -499,6 +499,52 @@ impl DataType {
))
}
}
+ Some(s) if s == "union" => {
+ if let Some(Value::String(mode)) = map.get("mode") {
+ let union_mode = if mode == "SPARSE" {
+ UnionMode::Sparse
+ } else if mode == "DENSE" {
+ UnionMode::Dense
+ } else {
+ return Err(ArrowError::ParseError(format!(
+ "Unknown union mode {:?} for union",
+ mode
+ )));
+ };
+ if let Some(type_ids) = map.get("typeIds") {
+ let type_ids = type_ids
+ .as_array()
+ .unwrap()
+ .iter()
+ .map(|t| t.as_i64().unwrap())
+ .collect::<Vec<_>>();
+
+ let default_fields = type_ids
+ .iter()
+ .map(|t| {
+ Field::new("", DataType::Boolean,
true).with_metadata(
Review Comment:
This is only a placeholder, as above other nested types (list, map, etc) do.
The actual fields will replace them (`Field::from`).
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