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include/rocksdb/advanced_iterator.h
36 строк
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anand76
Multi scan API (#13473)
03 апр 2025, 02:07
03 апр 2025, 02:07
24e2b05
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// Copyright (c) Meta Platforms, Inc. and affiliates. // This source code is licensed under both the GPLv2 (found in the // COPYING file in the root directory) and Apache 2.0 License // (found in the LICENSE.Apache file in the root directory). #pragma once #include "rocksdb/slice.h" namespace ROCKSDB_NAMESPACE { enum class IterBoundCheck : char { kUnknown = 0, kOutOfBound, kInbound, }; // This structure encapsulates the result of NextAndGetResult() struct IterateResult { // The lifetime of key is guaranteed until Next()/NextAndGetResult() is // called. Slice key; // If the iterator becomes invalid after a NextAndGetResult(), the table // iterator should set this to indicate whether it became invalid due // to the next key being out of bound (kOutOfBound) or it reached end // of file (kUnknown). If the iiterator is still valid, this should // be set to kInbound. IterBoundCheck bound_check_result = IterBoundCheck::kUnknown; // If false, PrepareValue() needs to be called before value() // This is useful if the table reader wants to materialize the value in a // lazy manner. In that case, it can set this to false and RocksDB // guarantees that it'll call PrepareValue() before calling value(). bool value_prepared = true; }; } // namespace ROCKSDB_NAMESPACE