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76 lines
2.5 KiB
C++
76 lines
2.5 KiB
C++
#pragma once
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#include <base/types.h>
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#include <unordered_map>
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#include <vector>
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namespace DB
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{
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class ReadBuffer;
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class WriteBuffer;
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/** More information about the block.
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*/
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struct BlockInfo
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{
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/** is_overflows:
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* After running GROUP BY ... WITH TOTALS with the max_rows_to_group_by and group_by_overflow_mode = 'any' settings,
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* a row is inserted in the separate block with aggregated values that have not passed max_rows_to_group_by.
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* If it is such a block, then is_overflows is set to true for it.
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*/
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/** bucket_num:
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* When using the two-level aggregation method, data with different key groups are scattered across different buckets.
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* In this case, the bucket number is indicated here. It is used to optimize the merge for distributed aggregation.
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* Otherwise -1.
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*/
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#define APPLY_FOR_BLOCK_INFO_FIELDS(M) \
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M(bool, is_overflows, false, 1) \
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M(Int32, bucket_num, -1, 2)
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#define DECLARE_FIELD(TYPE, NAME, DEFAULT, FIELD_NUM) \
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TYPE NAME = DEFAULT;
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APPLY_FOR_BLOCK_INFO_FIELDS(DECLARE_FIELD)
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#undef DECLARE_FIELD
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/// Write the values in binary form. NOTE: You could use protobuf, but it would be overkill for this case.
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void write(WriteBuffer & out) const;
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/// Read the values in binary form.
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void read(ReadBuffer & in);
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};
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/// Block extension to support delayed defaults. AddingDefaultsTransform uses it to replace missing values with column defaults.
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class BlockMissingValues
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{
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public:
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using RowsBitMask = std::vector<bool>; /// a bit per row for a column
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/// Get mask for column, column_idx is index inside corresponding block
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const RowsBitMask & getDefaultsBitmask(size_t column_idx) const;
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/// Check that we have to replace default value at least in one of columns
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bool hasDefaultBits(size_t column_idx) const;
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/// Set bit for a specified row in a single column.
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void setBit(size_t column_idx, size_t row_idx);
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/// Set bits for all rows in a single column.
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void setBits(size_t column_idx, size_t rows);
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bool empty() const { return rows_mask_by_column_id.empty(); }
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size_t size() const { return rows_mask_by_column_id.size(); }
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void clear() { rows_mask_by_column_id.clear(); }
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private:
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using RowsMaskByColumnId = std::unordered_map<size_t, RowsBitMask>;
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/// If rows_mask_by_column_id[column_id][row_id] is true related value in Block should be replaced with column default.
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/// It could contain less columns and rows then related block.
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RowsMaskByColumnId rows_mask_by_column_id;
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};
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}
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