Method copy

src/backend/core/column/ColumnPrivate.cpp:1411–1467

* \brief Copy another column of the same type * * This function will return false if the data type * of 'other' is not the same as the type of 'this'. * Use a filter to convert a column to another type. */

 * Use a filter to convert a column to another type.
 */
bool ColumnPrivate::copy(const AbstractColumn* other) {
	DEBUG(Q_FUNC_INFO)
	if (other->columnMode() != columnMode())
		return false;
	// 	DEBUG(Q_FUNC_INFO << ", mode = " << ENUM_TO_STRING(AbstractColumn, ColumnMode, columnMode()));
	int num_rows = other->rowCount();
	// 	DEBUG(Q_FUNC_INFO << ", rows " << num_rows);

	Q_EMIT q->dataAboutToChange(q);
	resizeTo(num_rows);

	if (!m_data) {
		if (!initDataContainer())
			return false; // failed to allocate memory
	}

	// copy the data
	switch (m_columnMode) {
	case AbstractColumn::ColumnMode::Double: {
		double* ptr = static_cast<QVector<double>*>(m_data)->data();
		for (int i = 0; i < num_rows; ++i)
			ptr[i] = other->valueAt(i);
		break;
	}
	case AbstractColumn::ColumnMode::Integer: {
		int* ptr = static_cast<QVector<int>*>(m_data)->data();
		for (int i = 0; i < num_rows; ++i)
			ptr[i] = other->integerAt(i);
		break;
	}
	case AbstractColumn::ColumnMode::BigInt: {
		qint64* ptr = static_cast<QVector<qint64>*>(m_data)->data();
		for (int i = 0; i < num_rows; ++i)
			ptr[i] = other->bigIntAt(i);
		break;
	}
	case AbstractColumn::ColumnMode::Text: {
		auto* vec = static_cast<QVector<QString>*>(m_data);
		for (int i = 0; i < num_rows; ++i)
			vec->replace(i, other->textAt(i));
		break;
	}
	case AbstractColumn::ColumnMode::DateTime:
	case AbstractColumn::ColumnMode::Month:
	case AbstractColumn::ColumnMode::Day: {
		auto* vec = static_cast<QVector<QDateTime>*>(m_data);
		for (int i = 0; i < num_rows; ++i)
			vec->replace(i, other->dateTimeAt(i));
		break;
	}
	}

	q->setChanged();

	DEBUG(Q_FUNC_INFO << ", done")
	return true;
}