pitrou commented on code in PR #50909:
URL: https://github.com/apache/arrow/pull/50909#discussion_r4131731309
##########
cpp/src/parquet/schema.cc:
##########
@@ -453,10 +453,21 @@ std::unique_ptr<Node> PrimitiveNode::FromParquet(const
void* opaque_element) {
std::unique_ptr<PrimitiveNode> primitive_node;
if (element->__isset.logicalType) {
// updated writer with logical type present
- primitive_node = std::unique_ptr<PrimitiveNode>(
- new PrimitiveNode(element->name,
LoadEnumSafe(&element->repetition_type),
- LogicalType::FromThrift(element->logicalType),
- LoadEnumSafe(&element->type), element->type_length,
field_id));
+ auto physical_type = LoadEnumSafe(&element->type);
+ auto logical_type = LogicalType::FromThrift(element->logicalType);
+ // Tolerate unrecognized logical/physical type combinations by dropping
the logical
+ // type annotation.
+ if (logical_type &&
+ !logical_type->is_applicable(physical_type, element->type_length)) {
+ ARROW_LOG(WARNING) << "Dropping unsupported logical type "
Review Comment:
Also cc @HuaHuaY
The main purpose of this PR is to allow reading Parquet files that use
features not yet implemented in Parquet C++ (a new logical/physical type
combination).
We don't emit warnings for other unrecognized features, so I think it's
reasonable to be silent here as well.
(warnings could come across as noisy, especially if the user cannot do
anything about them)
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