1 /* 2 * Copyright (C) 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef SRC_TRACE_PROCESSOR_DB_COLUMN_NULL_OVERLAY_H_ 18 #define SRC_TRACE_PROCESSOR_DB_COLUMN_NULL_OVERLAY_H_ 19 20 #include <cstdint> 21 #include <memory> 22 #include <optional> 23 #include <string> 24 25 #include "perfetto/trace_processor/basic_types.h" 26 #include "src/trace_processor/containers/bit_vector.h" 27 #include "src/trace_processor/db/column/data_layer.h" 28 #include "src/trace_processor/db/column/overlay_layer.h" 29 #include "src/trace_processor/db/column/types.h" 30 31 namespace perfetto::trace_processor::column { 32 33 // Overlay which introduces the layer of nullability. Specifically, spreads out 34 // the storage with nulls using a BitVector. 35 class NullOverlay final : public OverlayLayer { 36 public: 37 explicit NullOverlay(const BitVector* non_null); 38 ~NullOverlay() override; 39 40 void Flatten(uint32_t* start, const uint32_t* end, uint32_t stride) override; 41 42 std::unique_ptr<DataLayerChain> MakeChain( 43 std::unique_ptr<DataLayerChain>, 44 ChainCreationArgs = ChainCreationArgs()); 45 46 private: 47 class ChainImpl : public DataLayerChain { 48 public: 49 ChainImpl(std::unique_ptr<DataLayerChain>, const BitVector* non_null); 50 51 SingleSearchResult SingleSearch(FilterOp, 52 SqlValue, 53 uint32_t) const override; 54 55 SearchValidationResult ValidateSearchConstraints(FilterOp, 56 SqlValue) const override; 57 58 RangeOrBitVector SearchValidated(FilterOp, SqlValue, Range) const override; 59 60 void IndexSearchValidated(FilterOp, SqlValue, Indices&) const override; 61 62 void StableSort(Token* start, Token* end, SortDirection) const override; 63 64 void Distinct(Indices&) const override; 65 66 std::optional<Token> MaxElement(Indices&) const override; 67 68 std::optional<Token> MinElement(Indices&) const override; 69 70 SqlValue Get_AvoidUsingBecauseSlow(uint32_t index) const override; 71 size()72 uint32_t size() const override { return non_null_->size(); } 73 DebugString()74 std::string DebugString() const override { return "NullOverlay"; } 75 76 private: 77 std::unique_ptr<DataLayerChain> inner_ = nullptr; 78 const BitVector* non_null_ = nullptr; 79 }; 80 81 const BitVector* non_null_ = nullptr; 82 }; 83 84 } // namespace perfetto::trace_processor::column 85 86 #endif // SRC_TRACE_PROCESSOR_DB_COLUMN_NULL_OVERLAY_H_ 87