wgtmac commented on code in PR #159:
URL: https://github.com/apache/iceberg-cpp/pull/159#discussion_r2268673543
##########
src/iceberg/parquet/parquet_schema_util.cc:
##########
@@ -17,20 +17,397 @@
* 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) {
+ const auto& time_type =
+ internal::checked_cast<const ::arrow::Time64Type&>(*arrow_type);
+ if (time_type.unit() == ::arrow::TimeUnit::MICRO) {
+ return {};
+ }
+ }
+ break;
+ case TypeId::kTimestamp:
+ if (arrow_type->id() == ::arrow::Type::TIMESTAMP) {
+ const auto& timestamp_type =
+ internal::checked_cast<const ::arrow::TimestampType&>(*arrow_type);
+ if (timestamp_type.unit() == ::arrow::TimeUnit::MICRO &&
+ timestamp_type.timezone().empty()) {
+ return {};
+ }
+ }
+ break;
+ case TypeId::kTimestampTz:
+ if (arrow_type->id() == ::arrow::Type::TIMESTAMP) {
+ const auto& timestamp_type =
+ internal::checked_cast<const ::arrow::TimestampType&>(*arrow_type);
+ if (timestamp_type.unit() == ::arrow::TimeUnit::MICRO &&
+ !timestamp_type.timezone().empty()) {
+ return {};
+ }
+ }
+ break;
+ case TypeId::kString:
+ if (arrow_type->id() == ::arrow::Type::STRING) {
+ return {};
+ }
+ break;
+ case TypeId::kBinary:
+ if (arrow_type->id() == ::arrow::Type::BINARY) {
+ return {};
+ }
+ break;
+ case TypeId::kDecimal:
+ if (arrow_type->id() == ::arrow::Type::DECIMAL128) {
+ const auto& decimal_type =
+ internal::checked_cast<const DecimalType&>(expected_type);
+ const auto& arrow_decimal =
+ internal::checked_cast<const
::arrow::Decimal128Type&>(*arrow_type);
+ if (decimal_type.scale() == arrow_decimal.scale() &&
+ decimal_type.precision() >= arrow_decimal.precision()) {
+ return {};
+ }
+ }
+ break;
+ case TypeId::kUuid:
+ if (arrow_type->id() == ::arrow::Type::FIXED_SIZE_BINARY) {
+ const auto& fixed_binary =
+ internal::checked_cast<const
::arrow::FixedSizeBinaryType&>(*arrow_type);
+ if (fixed_binary.byte_width() == 16) {
+ return {};
+ }
+ }
Review Comment:
Good catch! Fixed.
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