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99 lines
3.0 KiB
C++
99 lines
3.0 KiB
C++
#pragma once
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#include <Storages/MergeTree/GinIndexStore.h>
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#include <vector>
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namespace DB
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{
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static inline constexpr auto FULL_TEXT_INDEX_NAME = "full_text";
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static inline constexpr UInt64 UNLIMITED_ROWS_PER_POSTINGS_LIST = 0;
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static inline constexpr UInt64 MIN_ROWS_PER_POSTINGS_LIST = 8 * 1024;
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static inline constexpr UInt64 DEFAULT_MAX_ROWS_PER_POSTINGS_LIST = 64 * 1024;
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struct GinFilterParameters
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{
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GinFilterParameters(size_t ngrams_, UInt64 max_rows_per_postings_list_);
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size_t ngrams;
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UInt64 max_rows_per_postings_list;
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};
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struct GinSegmentWithRowIdRange
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{
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/// Segment ID of the row ID range
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UInt32 segment_id;
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/// First row ID in the range
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UInt32 range_start;
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/// Last row ID in the range (inclusive)
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UInt32 range_end;
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};
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using GinSegmentWithRowIdRangeVector = std::vector<GinSegmentWithRowIdRange>;
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/// GinFilter provides underlying functionalities for building full-text index and also
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/// it does filtering the unmatched rows according to its query string.
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/// It also builds and uses skipping index which stores (segmentID, RowIDStart, RowIDEnd) triples.
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class GinFilter
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{
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public:
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explicit GinFilter(const GinFilterParameters & params_);
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/// Add term (located at 'data' with length 'len') and its row ID to the postings list builder
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/// for building full-text index for the given store.
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void add(const char * data, size_t len, UInt32 rowID, GinIndexStorePtr & store) const;
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/// Accumulate (segmentID, RowIDStart, RowIDEnd) for building skipping index
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void addRowRangeToGinFilter(UInt32 segmentID, UInt32 rowIDStart, UInt32 rowIDEnd);
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/// Clear the content
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void clear();
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/// Check if the filter (built from query string) contains any rows in given filter by using
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/// given postings list cache
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bool contains(const GinFilter & filter, PostingsCacheForStore & cache_store) const;
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/// Set the query string of the filter
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void setQueryString(const char * data, size_t len)
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{
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query_string = String(data, len);
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}
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/// Add term which are tokens generated from the query string
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void addTerm(const char * data, size_t len)
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{
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if (len > FST::MAX_TERM_LENGTH)
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return;
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terms.push_back(String(data, len));
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}
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/// Getter
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const String & getQueryString() const { return query_string; }
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const std::vector<String> & getTerms() const { return terms; }
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const GinSegmentWithRowIdRangeVector & getFilter() const { return rowid_ranges; }
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GinSegmentWithRowIdRangeVector & getFilter() { return rowid_ranges; }
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private:
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/// Filter parameters
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const GinFilterParameters & params;
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/// Query string of the filter
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String query_string;
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/// Tokenized terms from query string
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std::vector<String> terms;
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/// Row ID ranges which are (segmentID, RowIDStart, RowIDEnd)
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GinSegmentWithRowIdRangeVector rowid_ranges;
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/// Check if the given postings list cache has matched rows by using the filter
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bool match(const GinPostingsCache & postings_cache) const;
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};
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using GinFilters = std::vector<GinFilter>;
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}
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