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130 lines
3.5 KiB
C++
130 lines
3.5 KiB
C++
#include <Interpreters/FillingRow.h>
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#include <Common/FieldVisitorsAccurateComparison.h>
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namespace DB
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{
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bool less(const Field & lhs, const Field & rhs, int direction)
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{
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if (direction == -1)
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return applyVisitor(FieldVisitorAccurateLess(), rhs, lhs);
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return applyVisitor(FieldVisitorAccurateLess(), lhs, rhs);
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}
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bool equals(const Field & lhs, const Field & rhs)
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{
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return applyVisitor(FieldVisitorAccurateEquals(), lhs, rhs);
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}
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FillingRow::FillingRow(const SortDescription & sort_description) : description(sort_description)
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{
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row.resize(description.size());
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}
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bool FillingRow::operator<(const FillingRow & other) const
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{
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for (size_t i = 0; i < size(); ++i)
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{
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if (row[i].isNull() || other[i].isNull() || equals(row[i], other[i]))
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continue;
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return less(row[i], other[i], getDirection(i));
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}
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return false;
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}
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bool FillingRow::operator==(const FillingRow & other) const
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{
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for (size_t i = 0; i < size(); ++i)
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if (!equals(row[i], other[i]))
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return false;
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return true;
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}
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bool FillingRow::next(const FillingRow & to_row)
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{
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size_t pos = 0;
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/// Find position we need to increment for generating next row.
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for (; pos < row.size(); ++pos)
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if (!row[pos].isNull() && !to_row[pos].isNull() && !equals(row[pos], to_row[pos]))
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break;
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if (pos == row.size() || less(to_row[pos], row[pos], getDirection(pos)))
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return false;
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/// If we have any 'fill_to' value at position greater than 'pos',
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/// we need to generate rows up to 'fill_to' value.
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for (size_t i = row.size() - 1; i > pos; --i)
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{
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if (getFillDescription(i).fill_to.isNull() || row[i].isNull())
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continue;
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auto next_value = row[i];
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applyVisitor(FieldVisitorSum(getFillDescription(i).fill_step), next_value);
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if (less(next_value, getFillDescription(i).fill_to, getDirection(i)))
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{
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row[i] = next_value;
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initFromDefaults(i + 1);
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return true;
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}
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}
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auto next_value = row[pos];
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applyVisitor(FieldVisitorSum(getFillDescription(pos).fill_step), next_value);
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if (less(to_row[pos], next_value, getDirection(pos)))
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return false;
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row[pos] = next_value;
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if (equals(row[pos], to_row[pos]))
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{
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bool is_less = false;
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for (size_t i = pos + 1; i < size(); ++i)
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{
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const auto & fill_from = getFillDescription(i).fill_from;
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if (!fill_from.isNull())
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row[i] = fill_from;
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else
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row[i] = to_row[i];
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is_less |= less(row[i], to_row[i], getDirection(i));
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}
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return is_less;
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}
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initFromDefaults(pos + 1);
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return true;
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}
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void FillingRow::initFromDefaults(size_t from_pos)
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{
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for (size_t i = from_pos; i < row.size(); ++i)
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row[i] = getFillDescription(i).fill_from;
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}
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void insertFromFillingRow(MutableColumns & filling_columns, MutableColumns & other_columns, const FillingRow & filling_row)
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{
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for (size_t i = 0; i < filling_columns.size(); ++i)
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{
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if (filling_row[i].isNull())
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filling_columns[i]->insertDefault();
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else
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filling_columns[i]->insert(filling_row[i]);
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}
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for (const auto & other_column : other_columns)
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other_column->insertDefault();
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}
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void copyRowFromColumns(MutableColumns & dest, const Columns & source, size_t row_num)
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{
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for (size_t i = 0; i < source.size(); ++i)
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dest[i]->insertFrom(*source[i], row_num);
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}
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}
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