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45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
#pragma once
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#include <Core/SortDescription.h>
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#include <Columns/IColumn.h>
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#include <Common/FieldVisitors.h>
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namespace DB
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{
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/// Compares fields in terms of sorting order, considering direction.
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bool less(const Field & lhs, const Field & rhs, int direction);
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bool equals(const Field & lhs, const Field & rhs);
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/** Helps to implement modifier WITH FILL for ORDER BY clause.
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* Stores row as array of fields and provides functions to generate next row for filling gaps and for comparing rows.
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* Used in FillingBlockInputStream and in FillingTransform.
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*/
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class FillingRow
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{
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public:
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FillingRow(const SortDescription & sort_description);
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/// Generates next row according to fill 'from', 'to' and 'step' values.
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bool next(const FillingRow & to_row);
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void initFromDefaults(size_t from_pos = 0);
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Field & operator[](size_t ind) { return row[ind]; }
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const Field & operator[](size_t ind) const { return row[ind]; }
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size_t size() const { return row.size(); }
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bool operator<(const FillingRow & other) const;
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bool operator==(const FillingRow & other) const;
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int getDirection(size_t ind) const { return description[ind].direction; }
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FillColumnDescription & getFillDescription(size_t ind) { return description[ind].fill_description; }
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private:
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std::vector<Field> row;
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SortDescription description;
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};
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void insertFromFillingRow(MutableColumns & filling_columns, MutableColumns & other_columns, const FillingRow & filling_row);
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void copyRowFromColumns(MutableColumns & dest, const Columns & source, size_t row_num);
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}
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