pitrou commented on a change in pull request #8366:
URL: https://github.com/apache/arrow/pull/8366#discussion_r500443163
##########
File path: cpp/src/parquet/arrow/schema.cc
##########
@@ -689,10 +686,91 @@ Status GetOriginSchema(const std::shared_ptr<const
KeyValueMetadata>& metadata,
// but that is not necessarily present in the field reconstitued from Parquet
data
// (for example, Parquet timestamp types doesn't carry timezone information).
-Status ApplyOriginalStorageMetadata(const Field& origin_field, SchemaField*
inferred) {
+Result<bool> ApplyOriginalMetadata(const Field& origin_field, SchemaField*
inferred);
+
+using NestedFieldRewrapper = std::function<Status(FieldVector, SchemaField*)>;
+
+Status RewrapStructField(FieldVector new_children, SchemaField* inferred) {
+ inferred->field =
inferred->field->WithType(::arrow::struct_(std::move(new_children)));
+ return Status::OK();
+}
+
+Status RewrapListField(FieldVector new_children, SchemaField* inferred) {
+ DCHECK_EQ(new_children.size(), 1);
+ inferred->field = inferred->field->WithType(::arrow::list(new_children[0]));
+ return Status::OK();
+}
+
+NestedFieldRewrapper GetNestedFieldRewrapper(const ArrowType& origin_type,
+ const ArrowType& inferred_type) {
+ switch (inferred_type.id()) {
+ case ::arrow::Type::STRUCT:
+ if (origin_type.id() == ::arrow::Type::STRUCT) {
+ return RewrapStructField;
+ }
+ break;
+ case ::arrow::Type::LIST:
+ // TODO also allow LARGE_LIST and FIXED_SIZE_LIST
Review comment:
@emkornfield I think you'll be able to add your changes here.
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