mapleFU commented on code in PR #35798:
URL: https://github.com/apache/arrow/pull/35798#discussion_r1209431926
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cpp/src/arrow/dataset/file_parquet.cc:
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@@ -224,6 +224,41 @@ Status ResolveOneFieldRef(
return Status::OK();
}
+bool IsValidFieldRef(const FieldRef& ref) {
+ if (ref.IsName()) return true;
+ if (const auto* nested_refs = ref.nested_refs()) {
+ for (const auto& nested_ref : *nested_refs) {
+ if (!nested_ref.IsName()) return false;
+ }
+ return true;
+ }
+ return false;
+}
+
+// Converts a field ref into a position-independent ref (containing only a
sequence of
+// names) based on the dataset schema. Returns `false` if no conversion was
needed.
+Result<bool> ValidateFieldRef(const FieldRef& ref, const Schema&
dataset_schema,
+ FieldRef* out) {
+ if (ARROW_PREDICT_TRUE(IsValidFieldRef(ref))) {
Review Comment:
Since you support LookUp by index, why `PREDICT_TRUE` is used here?
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