| // 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_APPLIER_H |
| #define KUDU_TABLET_DELTA_APPLIER_H |
| |
| #include <string> |
| #include <memory> |
| #include <vector> |
| |
| #include <gtest/gtest_prod.h> |
| |
| #include "kudu/common/iterator.h" |
| #include "kudu/common/schema.h" |
| #include "kudu/gutil/macros.h" |
| #include "kudu/util/status.h" |
| #include "kudu/tablet/cfile_set.h" |
| |
| namespace kudu { |
| namespace tablet { |
| |
| class DeltaIterator; |
| |
| //////////////////////////////////////////////////////////// |
| // Delta-applying iterators |
| //////////////////////////////////////////////////////////// |
| |
| // A DeltaApplier takes in a base ColumnwiseIterator along with a a |
| // DeltaIterator. It is responsible for applying the updates coming |
| // from the delta iterator to the results of the base iterator. |
| class DeltaApplier : public ColumnwiseIterator { |
| public: |
| virtual Status Init(ScanSpec *spec) OVERRIDE; |
| Status PrepareBatch(size_t *nrows) OVERRIDE; |
| |
| Status FinishBatch() OVERRIDE; |
| |
| bool HasNext() const OVERRIDE; |
| |
| std::string ToString() const OVERRIDE; |
| |
| const Schema &schema() const OVERRIDE; |
| |
| virtual void GetIteratorStats(std::vector<IteratorStats>* stats) const OVERRIDE; |
| |
| // Initialize the selection vector for the current batch. |
| // This processes DELETEs -- any deleted rows are set to 0 in 'sel_vec'. |
| // All other rows are set to 1. |
| virtual Status InitializeSelectionVector(SelectionVector *sel_vec) OVERRIDE; |
| |
| Status MaterializeColumn(ColumnMaterializationContext *ctx) override; |
| private: |
| friend class DeltaTracker; |
| |
| FRIEND_TEST(TestMajorDeltaCompaction, TestCompact); |
| |
| DISALLOW_COPY_AND_ASSIGN(DeltaApplier); |
| |
| // Construct. The base_iter and delta_iter should not be Initted. |
| DeltaApplier(std::shared_ptr<CFileSet::Iterator> base_iter, |
| std::unique_ptr<DeltaIterator> delta_iter); |
| virtual ~DeltaApplier(); |
| |
| std::shared_ptr<CFileSet::Iterator> base_iter_; |
| std::unique_ptr<DeltaIterator> delta_iter_; |
| |
| bool first_prepare_; |
| }; |
| |
| } // namespace tablet |
| } // namespace kudu |
| #endif /* KUDU_TABLET_DELTA_APPLIER_H */ |