feat: add update partition stats

src/iceberg/CMakeLists.txt

@@ -92,6 +92,7 @@ set(ICEBERG_SOURCES
     update/snapshot_update.cc
     update/update_location.cc
     update/update_partition_spec.cc
+    update/update_partition_statistics.cc
     update/update_properties.cc
     update/update_schema.cc
     update/update_snapshot_reference.cc

src/iceberg/json_internal.cc

@@ -192,6 +192,9 @@ constexpr std::string_view kActionRemoveProperties = "remove-properties";
 constexpr std::string_view kActionSetLocation = "set-location";
 constexpr std::string_view kActionSetStatistics = "set-statistics";
 constexpr std::string_view kActionRemoveStatistics = "remove-statistics";
+constexpr std::string_view kActionSetPartitionStatistics = "set-partition-statistics";
+constexpr std::string_view kActionRemovePartitionStatistics =
+    "remove-partition-statistics";
 
 // TableUpdate field constants
 constexpr std::string_view kUUID = "uuid";
@@ -1439,6 +1442,24 @@ nlohmann::json ToJson(const TableUpdate& update) {
       json[kSnapshotId] = u.snapshot_id();
       break;
     }
+    case TableUpdate::Kind::kSetPartitionStatistics: {
+      const auto& u =
+          internal::checked_cast<const table::SetPartitionStatistics&>(update);
+      json[kAction] = kActionSetPartitionStatistics;
+      if (u.partition_statistics_file()) {
+        json[kPartitionStatistics] = ToJson(*u.partition_statistics_file());
+      } else {
+        json[kPartitionStatistics] = nlohmann::json::value_t::null;
+      }
+      break;
+    }
+    case TableUpdate::Kind::kRemovePartitionStatistics: {
+      const auto& u =
+          internal::checked_cast<const table::RemovePartitionStatistics&>(update);
+      json[kAction] = kActionRemovePartitionStatistics;
+      json[kSnapshotId] = u.snapshot_id();
+      break;
+    }
   }
   return json;
 }
@@ -1628,6 +1649,18 @@ Result<std::unique_ptr<TableUpdate>> TableUpdateFromJson(const nlohmann::json& j
     ICEBERG_ASSIGN_OR_RAISE(auto snapshot_id, GetJsonValue<int64_t>(json, kSnapshotId));
     return std::make_unique<table::RemoveStatistics>(snapshot_id);
   }
+  if (action == kActionSetPartitionStatistics) {
+    ICEBERG_ASSIGN_OR_RAISE(auto partition_statistics_json,
+                            GetJsonValue<nlohmann::json>(json, kPartitionStatistics));
+    ICEBERG_ASSIGN_OR_RAISE(auto partition_statistics_file,
+                            PartitionStatisticsFileFromJson(partition_statistics_json));
+    return std::make_unique<table::SetPartitionStatistics>(
+        std::move(partition_statistics_file));
+  }
+  if (action == kActionRemovePartitionStatistics) {
+    ICEBERG_ASSIGN_OR_RAISE(auto snapshot_id, GetJsonValue<int64_t>(json, kSnapshotId));
+    return std::make_unique<table::RemovePartitionStatistics>(snapshot_id);
+  }
 
   return JsonParseError("Unknown table update action: {}", action);
 }

src/iceberg/meson.build

@@ -110,6 +110,7 @@ iceberg_sources = files(
     'update/snapshot_update.cc',
     'update/update_location.cc',
     'update/update_partition_spec.cc',
+    'update/update_partition_statistics.cc',
     'update/update_properties.cc',
     'update/update_schema.cc',
     'update/update_snapshot_reference.cc',

src/iceberg/table.cc

@@ -33,6 +33,7 @@
 #include "iceberg/transaction.h"
 #include "iceberg/update/expire_snapshots.h"
 #include "iceberg/update/update_partition_spec.h"
+#include "iceberg/update/update_partition_statistics.h"
 #include "iceberg/update/update_properties.h"
 #include "iceberg/update/update_schema.h"
 #include "iceberg/update/update_statistics.h"
@@ -214,6 +215,13 @@ Result<std::shared_ptr<UpdateStatistics>> Table::NewUpdateStatistics() {
   return transaction->NewUpdateStatistics();
 }
 
+Result<std::shared_ptr<UpdatePartitionStatistics>> Table::NewUpdatePartitionStatistics() {
+  ICEBERG_ASSIGN_OR_RAISE(
+      auto transaction, Transaction::Make(shared_from_this(), Transaction::Kind::kUpdate,
+                                          /*auto_commit=*/true));
+  return transaction->NewUpdatePartitionStatistics();
+}
+
 Result<std::shared_ptr<StagedTable>> StagedTable::Make(
     TableIdentifier identifier, std::shared_ptr<TableMetadata> metadata,
     std::string metadata_location, std::shared_ptr<FileIO> io,

src/iceberg/table.h

@@ -156,6 +156,11 @@ class ICEBERG_EXPORT Table : public std::enable_shared_from_this<Table> {
   /// changes.
   virtual Result<std::shared_ptr<UpdateStatistics>> NewUpdateStatistics();
 
+  /// \brief Create a new UpdatePartitionStatistics to update partition statistics and
+  /// commit the changes.
+  virtual Result<std::shared_ptr<UpdatePartitionStatistics>>
+  NewUpdatePartitionStatistics();
+
   /// \brief Create a new UpdateLocation to update the table location and commit the
   /// changes.
   virtual Result<std::shared_ptr<UpdateLocation>> NewUpdateLocation();

src/iceberg/table_metadata.cc

@@ -623,6 +623,9 @@ class TableMetadataBuilder::Impl {
   Status RemovePartitionSpecs(const std::vector<int32_t>& spec_ids);
   Status SetStatistics(std::shared_ptr<StatisticsFile> statistics_file);
   Status RemoveStatistics(int64_t snapshot_id);
+  Status SetPartitionStatistics(
+      std::shared_ptr<PartitionStatisticsFile> partition_statistics_file);
+  Status RemovePartitionStatistics(int64_t snapshot_id);
 
   Result<std::unique_ptr<TableMetadata>> Build();
 
@@ -1208,6 +1211,41 @@ Status TableMetadataBuilder::Impl::RemoveStatistics(int64_t snapshot_id) {
   return {};
 }
 
+Status TableMetadataBuilder::Impl::SetPartitionStatistics(
+    std::shared_ptr<PartitionStatisticsFile> partition_statistics_file) {
+  ICEBERG_PRECHECK(partition_statistics_file != nullptr,
+                   "Cannot set null partition statistics file");
+
+  // Find and replace existing partition statistics for the same snapshot_id, or add new
+  // one
+  auto it = std::ranges::find_if(
+      metadata_.partition_statistics,
+      [snapshot_id = partition_statistics_file->snapshot_id](const auto& stat) {
+        return stat && stat->snapshot_id == snapshot_id;
+      });
+
+  if (it != metadata_.partition_statistics.end()) {
+    *it = partition_statistics_file;
+  } else {
+    metadata_.partition_statistics.push_back(partition_statistics_file);
+  }
+
+  changes_.push_back(std::make_unique<table::SetPartitionStatistics>(
+      std::move(partition_statistics_file)));
+  return {};
+}
+
+Status TableMetadataBuilder::Impl::RemovePartitionStatistics(int64_t snapshot_id) {
+  auto removed_count =
+      std::erase_if(metadata_.partition_statistics, [snapshot_id](const auto& stat) {
+        return stat && stat->snapshot_id == snapshot_id;
+      });
+  if (removed_count != 0) {
+    changes_.push_back(std::make_unique<table::RemovePartitionStatistics>(snapshot_id));
+  }
+  return {};
+}
+
 std::unordered_set<int64_t> TableMetadataBuilder::Impl::IntermediateSnapshotIdSet(
     int64_t current_snapshot_id) const {
   std::unordered_set<int64_t> added_snapshot_ids;
@@ -1636,12 +1674,15 @@ TableMetadataBuilder& TableMetadataBuilder::RemoveStatistics(int64_t snapshot_id
 
 TableMetadataBuilder& TableMetadataBuilder::SetPartitionStatistics(
     const std::shared_ptr<PartitionStatisticsFile>& partition_statistics_file) {
-  throw IcebergError(std::format("{} not implemented", __FUNCTION__));
+  ICEBERG_BUILDER_RETURN_IF_ERROR(
+      impl_->SetPartitionStatistics(partition_statistics_file));
+  return *this;
 }
 
 TableMetadataBuilder& TableMetadataBuilder::RemovePartitionStatistics(
     int64_t snapshot_id) {
-  throw IcebergError(std::format("{} not implemented", __FUNCTION__));
+  ICEBERG_BUILDER_RETURN_IF_ERROR(impl_->RemovePartitionStatistics(snapshot_id));
+  return *this;
 }
 
 TableMetadataBuilder& TableMetadataBuilder::SetProperties(

src/iceberg/table_update.cc

@@ -500,4 +500,60 @@ std::unique_ptr<TableUpdate> RemoveStatistics::Clone() const {
   return std::make_unique<RemoveStatistics>(snapshot_id_);
 }
 
+// SetPartitionStatistics
+
+int64_t SetPartitionStatistics::snapshot_id() const {
+  return partition_statistics_file_->snapshot_id;
+}
+
+void SetPartitionStatistics::ApplyTo(TableMetadataBuilder& builder) const {
+  builder.SetPartitionStatistics(partition_statistics_file_);
+}
+
+void SetPartitionStatistics::GenerateRequirements(TableUpdateContext& context) const {
+  // SetPartitionStatistics doesn't generate any requirements
+}
+
+bool SetPartitionStatistics::Equals(const TableUpdate& other) const {
+  if (other.kind() != Kind::kSetPartitionStatistics) {
+    return false;
+  }
+  const auto& other_set = internal::checked_cast<const SetPartitionStatistics&>(other);
+  if (!partition_statistics_file_ != !other_set.partition_statistics_file_) {
+    return false;
+  }
+  if (partition_statistics_file_ &&
+      !(*partition_statistics_file_ == *other_set.partition_statistics_file_)) {
+    return false;
+  }
+  return true;
+}
+
+std::unique_ptr<TableUpdate> SetPartitionStatistics::Clone() const {
+  return std::make_unique<SetPartitionStatistics>(partition_statistics_file_);
+}
+
+// RemovePartitionStatistics
+
+void RemovePartitionStatistics::ApplyTo(TableMetadataBuilder& builder) const {
+  builder.RemovePartitionStatistics(snapshot_id_);
+}
+
+void RemovePartitionStatistics::GenerateRequirements(TableUpdateContext& context) const {
+  // RemovePartitionStatistics doesn't generate any requirements
+}
+
+bool RemovePartitionStatistics::Equals(const TableUpdate& other) const {
+  if (other.kind() != Kind::kRemovePartitionStatistics) {
+    return false;
+  }
+  const auto& other_remove =
+      internal::checked_cast<const RemovePartitionStatistics&>(other);
+  return snapshot_id_ == other_remove.snapshot_id_;
+}
+
+std::unique_ptr<TableUpdate> RemovePartitionStatistics::Clone() const {
+  return std::make_unique<RemovePartitionStatistics>(snapshot_id_);
+}
+
 }  // namespace iceberg::table

src/iceberg/table_update.h

@@ -61,6 +61,8 @@ class ICEBERG_EXPORT TableUpdate {
     kSetLocation,
     kSetStatistics,
     kRemoveStatistics,
+    kSetPartitionStatistics,
+    kRemovePartitionStatistics,
   };
 
   virtual ~TableUpdate();
@@ -558,6 +560,54 @@ class ICEBERG_EXPORT RemoveStatistics : public TableUpdate {
   int64_t snapshot_id_;
 };
 
+/// \brief Represents setting partition statistics for a snapshot
+class ICEBERG_EXPORT SetPartitionStatistics : public TableUpdate {
+ public:
+  explicit SetPartitionStatistics(
+      std::shared_ptr<PartitionStatisticsFile> partition_statistics_file)
+      : partition_statistics_file_(std::move(partition_statistics_file)) {}
+
+  int64_t snapshot_id() const;
+
+  const std::shared_ptr<PartitionStatisticsFile>& partition_statistics_file() const {
+    return partition_statistics_file_;
+  }
+
+  void ApplyTo(TableMetadataBuilder& builder) const override;
+
+  void GenerateRequirements(TableUpdateContext& context) const override;
+
+  Kind kind() const override { return Kind::kSetPartitionStatistics; }
+
+  bool Equals(const TableUpdate& other) const override;
+
+  std::unique_ptr<TableUpdate> Clone() const override;
+
+ private:
+  std::shared_ptr<PartitionStatisticsFile> partition_statistics_file_;
+};
+
+/// \brief Represents removing partition statistics for a snapshot
+class ICEBERG_EXPORT RemovePartitionStatistics : public TableUpdate {
+ public:
+  explicit RemovePartitionStatistics(int64_t snapshot_id) : snapshot_id_(snapshot_id) {}
+
+  int64_t snapshot_id() const { return snapshot_id_; }
+
+  void ApplyTo(TableMetadataBuilder& builder) const override;
+
+  void GenerateRequirements(TableUpdateContext& context) const override;
+
+  Kind kind() const override { return Kind::kRemovePartitionStatistics; }
+
+  bool Equals(const TableUpdate& other) const override;
+
+  std::unique_ptr<TableUpdate> Clone() const override;
+
+ private:
+  int64_t snapshot_id_;
+};
+
 }  // namespace table
 
 }  // namespace iceberg

src/iceberg/test/CMakeLists.txt

@@ -181,7 +181,8 @@ if(ICEBERG_BUILD_BUNDLE)
                    update_properties_test.cc
                    update_schema_test.cc
                    update_sort_order_test.cc
-                   update_statistics_test.cc)
+                   update_statistics_test.cc
+                   update_partition_statistics_test.cc)
 
   add_iceberg_test(data_writer_test USE_BUNDLE SOURCES data_writer_test.cc)
 

src/iceberg/test/json_internal_test.cc

@@ -613,6 +613,43 @@ TEST(JsonInternalTest, TableUpdateRemoveStatistics) {
             update);
 }
 
+TEST(JsonInternalTest, TableUpdateSetPartitionStatistics) {
+  auto partition_stats_file = std::make_shared<PartitionStatisticsFile>();
+  partition_stats_file->snapshot_id = 123456789;
+  partition_stats_file->path =
+      "s3://bucket/warehouse/table/metadata/partition-stats-123456789.parquet";
+  partition_stats_file->file_size_in_bytes = 2048;
+
+  table::SetPartitionStatistics update(partition_stats_file);
+  nlohmann::json expected = R"({
+    "action": "set-partition-statistics",
+    "partition-statistics": {
+      "snapshot-id": 123456789,
+      "statistics-path": "s3://bucket/warehouse/table/metadata/partition-stats-123456789.parquet",
+      "file-size-in-bytes": 2048
+    }
+  })"_json;
+
+  EXPECT_EQ(ToJson(update), expected);
+  auto parsed = TableUpdateFromJson(expected);
+  ASSERT_THAT(parsed, IsOk());
+  EXPECT_EQ(*internal::checked_cast<table::SetPartitionStatistics*>(parsed.value().get()),
+            update);
+}
+
+TEST(JsonInternalTest, TableUpdateRemovePartitionStatistics) {
+  table::RemovePartitionStatistics update(123456789);
+  nlohmann::json expected =
+      R"({"action":"remove-partition-statistics","snapshot-id":123456789})"_json;
+
+  EXPECT_EQ(ToJson(update), expected);
+  auto parsed = TableUpdateFromJson(expected);
+  ASSERT_THAT(parsed, IsOk());
+  EXPECT_EQ(
+      *internal::checked_cast<table::RemovePartitionStatistics*>(parsed.value().get()),
+      update);
+}
+
 TEST(JsonInternalTest, TableUpdateUnknownAction) {
   nlohmann::json json = R"({"action":"unknown-action"})"_json;
   auto result = TableUpdateFromJson(json);