emkornfield commented on a change in pull request #8939:
URL: https://github.com/apache/arrow/pull/8939#discussion_r544474457
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File path: cpp/src/parquet/arrow/schema.cc
##########
@@ -113,12 +114,21 @@ Status StructToNode(const
std::shared_ptr<::arrow::StructType>& type,
const WriterProperties& properties,
const ArrowWriterProperties& arrow_properties, NodePtr*
out) {
std::vector<NodePtr> children(type->num_fields());
- for (int i = 0; i < type->num_fields(); i++) {
- RETURN_NOT_OK(FieldToNode(type->field(i)->name(), type->field(i),
properties,
- arrow_properties, &children[i]));
+ if (type->num_fields() != 0) {
+ for (int i = 0; i < type->num_fields(); i++) {
+ RETURN_NOT_OK(FieldToNode(type->field(i)->name(), type->field(i),
properties,
+ arrow_properties, &children[i]));
+ }
+ } else {
+ // XXX (ARROW-10928) We could add a dummy primitive node but that would
+ // require special handling when writing and reading, to avoid column index
+ // mismatches.
+ return Status::NotImplemented(
+ "Cannot write struct type with no child fields to Parquet. "
Review comment:
would the struct field have a name here? Consider removing "dummy" from
the message.
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