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28 lines
880 B
C++
28 lines
880 B
C++
#pragma once
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#include "search/base/text_index/reader.hpp"
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class FileWriter;
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namespace search_base
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{
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// Merges two on-disk text indexes and writes them to a new one.
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class TextIndexMerger
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{
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public:
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// The merging process is as follows.
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// 1. Dictionaries from both indexes are read into memory, merged
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// and written to disk.
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// 2. One uint32_t per entry is reserved in memory to calculate the
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// offsets of the postings lists.
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// 3. One token at a time, all postings for the token are read from
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// both indexes into memory, unified and written to disk.
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// 4. The offsets are written to disk.
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//
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// Note that the dictionary and offsets are kept in memory during the whole
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// merging process.
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static void Merge(TextIndexReader const & index1, TextIndexReader const & index2,
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FileWriter & sink);
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};
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} // namespace search_base
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