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109 lines
3.3 KiB
C++
109 lines
3.3 KiB
C++
#pragma once
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#include <vector>
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#include <Storages/MergeTree/MarkRange.h>
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namespace DB
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{
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/// Class contains information about index granularity in rows of IMergeTreeDataPart
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/// Inside it contains vector of partial sums of rows after mark:
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/// |-----|---|----|----|
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/// | 5 | 8 | 12 | 16 |
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/// If user doesn't specify setting adaptive_index_granularity_bytes for MergeTree* table
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/// all values in inner vector would have constant stride (default 8192).
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class MergeTreeIndexGranularity
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{
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private:
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std::vector<size_t> marks_rows_partial_sums;
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bool initialized = false;
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public:
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MergeTreeIndexGranularity() = default;
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explicit MergeTreeIndexGranularity(const std::vector<size_t> & marks_rows_partial_sums_);
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MergeTreeIndexGranularity(size_t marks_count, size_t fixed_granularity);
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/// Return count of rows between marks
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size_t getRowsCountInRange(const MarkRange & range) const;
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/// Return count of rows between marks
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size_t getRowsCountInRange(size_t begin, size_t end) const;
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/// Return sum of rows between all ranges
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size_t getRowsCountInRanges(const MarkRanges & ranges) const;
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/// Return amount of marks that contains amount of `number_of_rows` starting from
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/// `from_mark` and possible some offset_in_rows from `from_mark`
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/// 1 2 <- answer
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/// |-----|---------------------------|----|----|
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/// ^------------------------^-----------^
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//// from_mark offset_in_rows number_of_rows
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size_t countMarksForRows(size_t from_mark, size_t number_of_rows, size_t offset_in_rows=0) const;
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/// Total marks
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size_t getMarksCount() const;
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/// Total rows
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size_t getTotalRows() const;
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/// Total number marks without final mark if it exists
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size_t getMarksCountWithoutFinal() const { return getMarksCount() - hasFinalMark(); }
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/// Rows after mark to next mark
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inline size_t getMarkRows(size_t mark_index) const
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{
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if (mark_index == 0)
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return marks_rows_partial_sums[0];
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else
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return marks_rows_partial_sums[mark_index] - marks_rows_partial_sums[mark_index - 1];
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}
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/// Return amount of rows before mark
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size_t getMarkStartingRow(size_t mark_index) const;
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/// Amount of rows after last mark
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size_t getLastMarkRows() const
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{
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size_t last = marks_rows_partial_sums.size() - 1;
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return getMarkRows(last);
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}
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size_t getLastNonFinalMarkRows() const
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{
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size_t last_mark_rows = getLastMarkRows();
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if (last_mark_rows != 0)
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return last_mark_rows;
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return getMarkRows(marks_rows_partial_sums.size() - 2);
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}
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bool hasFinalMark() const
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{
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return getLastMarkRows() == 0;
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}
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bool empty() const
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{
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return marks_rows_partial_sums.empty();
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}
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bool isInitialized() const
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{
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return initialized;
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}
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void setInitialized()
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{
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initialized = true;
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}
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/// Add new mark with rows_count
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void appendMark(size_t rows_count);
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/// Extends last mark by rows_count.
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void addRowsToLastMark(size_t rows_count);
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/// Drops last mark if any exists.
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void popMark();
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/// Add `size` of marks with `fixed_granularity` rows
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void resizeWithFixedGranularity(size_t size, size_t fixed_granularity);
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};
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}
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