wgtmac commented on code in PR #158:
URL: https://github.com/apache/iceberg-cpp/pull/158#discussion_r2250301053
##########
src/iceberg/parquet/parquet_schema_util.cc:
##########
@@ -30,8 +33,21 @@ Result<std::vector<int>> SelectedColumnIndices(const
SchemaProjection& projectio
return NotImplemented("NYI");
}
-Result<bool> HasFieldIds(const ::parquet::schema::NodePtr& root_node) {
- return NotImplemented("NYI");
+bool HasFieldIds(const ::parquet::schema::NodePtr& node) {
+ if (node->field_id() >= 0) {
+ return true;
+ }
+
+ if (node->is_group()) {
+ auto group_node =
internal::checked_pointer_cast<::parquet::schema::GroupNode>(node);
+ for (int i = 0; i < group_node->field_count(); i++) {
+ if (HasFieldIds(group_node->field(i))) {
+ return true;
+ }
+ }
Review Comment:
I think Iceberg only supports three-level list encoding per the spec:
https://iceberg.apache.org/spec/#parquet
> Lists must use the [3-level
representation](https://github.com/apache/parquet-format/blob/master/LogicalTypes.md#lists).
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