viirya commented on code in PR #1677:
URL: https://github.com/apache/arrow-rs/pull/1677#discussion_r869678255
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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 because, `type` (union, map, list, etc) is defined in "type" of the
Json map, fields are defined in "children" of the map. We parse "type" to get
the nested type and parse "children" to get actual fields after that.
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