fix partition spec init

Author: xiao.dong

src/iceberg/manifest_entry.h

@@ -29,6 +29,7 @@
 #include "iceberg/expression/literal.h"
 #include "iceberg/file_format.h"
 #include "iceberg/iceberg_export.h"
+#include "iceberg/partition_spec.h"
 #include "iceberg/result.h"
 #include "iceberg/schema_field.h"
 #include "iceberg/type.h"
@@ -146,7 +147,7 @@ struct ICEBERG_EXPORT DataFile {
   std::optional<int32_t> sort_order_id;
   /// This field is not included in spec, so it is not serialized into the manifest file.
   /// It is just store in memory representation used in process.
-  int32_t partition_spec_id = 0;
+  int32_t partition_spec_id = PartitionSpec::kInitialSpecId;
   /// Field id: 142
   /// The _row_id for the first row in the data file.
   ///

src/iceberg/manifest_list.h

@@ -28,6 +28,7 @@
 #include <utility>
 
 #include "iceberg/iceberg_export.h"
+#include "iceberg/partition_spec.h"
 #include "iceberg/result.h"
 #include "iceberg/schema_field.h"
 #include "iceberg/snapshot.h"
@@ -91,7 +92,7 @@ struct ICEBERG_EXPORT ManifestFile {
   /// Field id: 502
   /// ID of a partition spec used to write the manifest; must be listed in table metadata
   /// partition-specs
-  int32_t partition_spec_id = 0;
+  int32_t partition_spec_id = PartitionSpec::kInitialSpecId;
   /// Field id: 517
   /// The type of files tracked by the manifest, either data or delete files; 0 for all v1
   /// manifests