manuzhang commented on code in PR #774: URL: https://github.com/apache/iceberg-cpp/pull/774#discussion_r4244616617
########## src/iceberg/update/rewrite_manifests.cc: ########## @@ -0,0 +1,463 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +#include "iceberg/update/rewrite_manifests.h" + +#include <algorithm> +#include <array> +#include <memory> +#include <optional> +#include <ranges> +#include <span> +#include <tuple> +#include <unordered_map> +#include <utility> +#include <vector> + +#include "iceberg/constants.h" +#include "iceberg/manifest/manifest_entry.h" +#include "iceberg/manifest/manifest_list.h" +#include "iceberg/manifest/manifest_reader.h" +#include "iceberg/manifest/manifest_util_internal.h" +#include "iceberg/manifest/manifest_writer.h" +#include "iceberg/snapshot.h" +#include "iceberg/table.h" // IWYU pragma: keep +#include "iceberg/table_metadata.h" +#include "iceberg/transaction.h" +#include "iceberg/util/executor_util_internal.h" +#include "iceberg/util/macros.h" + +namespace iceberg { + +namespace { + +struct RewriteCandidate { + ManifestFile manifest; + std::shared_ptr<PartitionSpec> spec; +}; + +struct ManifestStream { + ManifestFile manifest; + std::shared_ptr<PartitionSpec> spec; + ManifestEntryStreamPtr entries; +}; + +struct RewriteWriter { + std::shared_ptr<PartitionSpec> spec; + std::unique_ptr<ManifestWriter> writer; +}; + +} // namespace + +Result<std::shared_ptr<RewriteManifests>> RewriteManifests::Make( + std::string table_name, std::shared_ptr<TransactionContext> ctx) { + ICEBERG_PRECHECK(!table_name.empty(), "Table name cannot be empty"); + ICEBERG_PRECHECK(ctx != nullptr, "Cannot create RewriteManifests without a context"); + return std::shared_ptr<RewriteManifests>( + new RewriteManifests(std::move(table_name), std::move(ctx))); +} + +RewriteManifests::RewriteManifests(std::string table_name, + std::shared_ptr<TransactionContext> ctx) + : SnapshotUpdate(std::move(ctx)), table_name_(std::move(table_name)) {} + +RewriteManifests& RewriteManifests::ClusterBy(ClusterByFunc func) { + ICEBERG_BUILDER_CHECK(static_cast<bool>(func), "Cluster function cannot be null"); + cluster_by_func_ = std::move(func); + return *this; +} + +RewriteManifests& RewriteManifests::RewriteIf(RewritePredicate predicate) { + ICEBERG_BUILDER_CHECK(static_cast<bool>(predicate), "Rewrite predicate cannot be null"); + predicate_ = std::move(predicate); + return *this; +} + +RewriteManifests& RewriteManifests::DeleteManifest(const ManifestFile& manifest) { + deleted_manifests_.insert(manifest); + return *this; +} + +RewriteManifests& RewriteManifests::AddManifest(const ManifestFile& manifest) { + // Reject added/deleted files unconditionally, matching Java's checkArgument. A + // missing count is treated as non-zero (has_*_files defaults to true), so the + // error is reported at the AddManifest call site rather than deferred to Apply. + ICEBERG_BUILDER_CHECK(!manifest.has_added_files(), + "Cannot add manifest with added files"); + ICEBERG_BUILDER_CHECK(!manifest.has_deleted_files(), + "Cannot add manifest with deleted files"); + ICEBERG_BUILDER_CHECK(!manifest.added_snapshot_id.has_value() || + manifest.added_snapshot_id == kInvalidSnapshotId, + "Snapshot id must be assigned during commit"); + ICEBERG_BUILDER_CHECK(manifest.sequence_number == kInvalidSequenceNumber, + "Sequence number must be assigned during commit"); + + if (can_inherit_snapshot_id()) { + added_manifests_.push_back(manifest); + } else { + // Retain the input so Apply can recreate the copy after retry cleanup. + added_manifests_to_copy_.push_back(manifest); + } + return *this; +} + +Status RewriteManifests::ValidateTargetBranch(const std::string& branch) const { + return NotSupported( + "Cannot commit to branch {}: RewriteManifests does not support branch commits", + branch); +} + +std::string RewriteManifests::operation() { return DataOperation::kReplace; } + +Result<std::vector<ManifestFile>> RewriteManifests::Apply( + const TableMetadata& /*metadata_to_update*/, + const std::shared_ptr<Snapshot>& snapshot) { + ICEBERG_PRECHECK(snapshot != nullptr, Review Comment: We shouldn't fail on an empty table. -- This is an automated message from the Apache Git Service. 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