| // 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. |
| #ifndef KUDU_TABLET_DELTA_ITERATOR_MERGER_H |
| #define KUDU_TABLET_DELTA_ITERATOR_MERGER_H |
| |
| #include <string> |
| #include <memory> |
| #include <vector> |
| |
| #include "kudu/tablet/delta_store.h" |
| |
| namespace kudu { |
| |
| class ScanSpec; |
| |
| namespace tablet { |
| |
| // DeltaIterator that simply combines together other DeltaIterators, |
| // applying deltas from each in order. |
| class DeltaIteratorMerger : public DeltaIterator { |
| public: |
| // Create a new DeltaIterator which combines the deltas from |
| // all of the input delta stores. |
| // |
| // If only one store is input, this will automatically return an unwrapped |
| // iterator for greater efficiency. |
| static Status Create( |
| const std::vector<std::shared_ptr<DeltaStore> > &stores, |
| const Schema* projection, |
| const MvccSnapshot &snapshot, |
| std::unique_ptr<DeltaIterator>* out); |
| |
| //////////////////////////////////////////////////////////// |
| // Implementations of DeltaIterator |
| //////////////////////////////////////////////////////////// |
| virtual Status Init(ScanSpec *spec) OVERRIDE; |
| virtual Status SeekToOrdinal(rowid_t idx) OVERRIDE; |
| virtual Status PrepareBatch(size_t nrows, PrepareFlag flag) OVERRIDE; |
| virtual Status ApplyUpdates(size_t col_to_apply, ColumnBlock *dst) OVERRIDE; |
| virtual Status ApplyDeletes(SelectionVector *sel_vec) OVERRIDE; |
| virtual Status CollectMutations(vector<Mutation *> *dst, Arena *arena) OVERRIDE; |
| virtual Status FilterColumnIdsAndCollectDeltas(const std::vector<ColumnId>& col_ids, |
| vector<DeltaKeyAndUpdate>* out, |
| Arena* arena) OVERRIDE; |
| virtual bool HasNext() OVERRIDE; |
| virtual std::string ToString() const OVERRIDE; |
| |
| private: |
| explicit DeltaIteratorMerger(vector<std::unique_ptr<DeltaIterator> > iters); |
| |
| std::vector<std::unique_ptr<DeltaIterator> > iters_; |
| }; |
| |
| } // namespace tablet |
| } // namespace kudu |
| |
| #endif // KUDU_TABLET_DELTA_ITERATOR_MERGER_H |