Method IndexExpression

src/jrd/btr.cpp:452–487

// IndexExpression class

IndexExpression::IndexExpression(thread_db* tdbb, index_desc* idx)
	: m_tdbb(tdbb)
{
	if (!(idx->idx_flags & idx_expression))
		return;

	fb_assert(idx->idx_expression);
	m_expression = idx->idx_expression;

	fb_assert(idx->idx_expression_statement);
	const auto orgRequest = tdbb->getRequest();
	m_request = idx->idx_expression_statement->findRequest(tdbb, true);

	if (!m_request)
		ERR_post(Arg::Gds(isc_random) << "Attempt to evaluate index expression recursively");

	fb_assert(m_request != orgRequest);

	fb_assert(!m_request->req_caller);
	m_request->req_caller = orgRequest;

	m_request->req_flags &= req_in_use;
	m_request->req_flags |= req_active;

	TRA_attach_request(tdbb->getTransaction(), m_request);
	fb_assert(m_request->req_transaction);
	TRA_setup_request_snapshot(tdbb, m_request);

	if (orgRequest)
		m_request->setGmtTimeStamp(orgRequest->getGmtTimeStamp());
	else
		m_request->validateTimeStamp();

	m_request->req_rpb[0].rpb_number.setValue(BOF_NUMBER);
	m_request->req_rpb[0].rpb_number.setValid(true);
}

IndexExpression::~IndexExpression()
{