wgtmac commented on code in PR #159:
URL: https://github.com/apache/iceberg-cpp/pull/159#discussion_r2263131645
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src/iceberg/parquet/parquet_schema_util.cc:
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@@ -17,20 +17,393 @@
* under the License.
*/
+#include <charconv>
+
+#include <arrow/type.h>
+#include <arrow/type_fwd.h>
+#include <arrow/util/key_value_metadata.h>
+#include <parquet/arrow/schema.h>
#include <parquet/schema.h>
+#include "iceberg/metadata_columns.h"
#include "iceberg/parquet/parquet_schema_util_internal.h"
+#include "iceberg/result.h"
+#include "iceberg/schema_util_internal.h"
#include "iceberg/util/checked_cast.h"
+#include "iceberg/util/formatter.h"
+#include "iceberg/util/macros.h"
namespace iceberg::parquet {
+namespace {
+
+constexpr std::string_view kParquetFieldIdKey = "PARQUET:field_id";
+
+std::optional<int32_t> FieldIdFromMetadata(
+ const std::shared_ptr<const ::arrow::KeyValueMetadata>& metadata) {
+ if (!metadata) {
+ return std::nullopt;
+ }
+ int key = metadata->FindKey(kParquetFieldIdKey);
+ if (key < 0) {
+ return std::nullopt;
+ }
+ std::string field_id_str = metadata->value(key);
+ int32_t field_id = -1;
+ auto [_, ec] = std::from_chars(field_id_str.data(),
+ field_id_str.data() + field_id_str.size(),
field_id);
+ if (ec != std::errc() || field_id < 0) {
+ return std::nullopt;
+ }
+ return field_id;
+}
+
+std::optional<int32_t> GetFieldId(const ::parquet::arrow::SchemaField&
parquet_field) {
+ return FieldIdFromMetadata(parquet_field.field->metadata());
+}
+
+// TODO(gangwu): support v3 unknown type
+Status ValidateParquetSchemaEvolution(
+ const Type& expected_type, const ::parquet::arrow::SchemaField&
parquet_field) {
+ const auto& arrow_type = parquet_field.field->type();
+ switch (expected_type.type_id()) {
+ case TypeId::kBoolean:
+ if (arrow_type->id() == ::arrow::Type::BOOL) {
+ return {};
+ }
+ break;
+ case TypeId::kInt:
+ if (arrow_type->id() == ::arrow::Type::INT32) {
+ return {};
+ }
+ break;
+ case TypeId::kLong:
+ if (arrow_type->id() == ::arrow::Type::INT64 ||
+ arrow_type->id() == ::arrow::Type::INT32) {
+ return {};
+ }
+ break;
+ case TypeId::kFloat:
+ if (arrow_type->id() == ::arrow::Type::FLOAT) {
+ return {};
+ }
+ break;
+ case TypeId::kDouble:
+ if (arrow_type->id() == ::arrow::Type::DOUBLE ||
+ arrow_type->id() == ::arrow::Type::FLOAT) {
+ return {};
+ }
+ break;
+ case TypeId::kDate:
+ if (arrow_type->id() == ::arrow::Type::DATE32) {
+ return {};
+ }
+ break;
+ case TypeId::kTime:
+ if (arrow_type->id() == ::arrow::Type::TIME64) {
Review Comment:
Good catch! I have added an exhaustive test case to make sure I don't miss
any primitive type.
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