Method parseWindow

src/jrd/RecordSourceNodes.cpp:2291–2412

Parse frame subclauses of window functions.

// Parse frame subclauses of window functions.
void WindowSourceNode::parseWindow(thread_db* tdbb, CompilerScratch* csb)
{
	SET_TDBB(tdbb);

	SSHORT context;
	Window& window = windows.add();
	window.stream = PAR_context(csb, &context);
	window.frameExtent = WindowClause::FrameExtent::createDefault(*tdbb->getDefaultPool());

	UCHAR verb, count;

	while ((verb = csb->csb_blr_reader.getByte()) != blr_end)
	{
		switch (verb)
		{
			case blr_window_win_partition:
				count = csb->csb_blr_reader.getByte();

				if (count != 0)
				{
					window.group = PAR_sort_internal(tdbb, csb, false, count);
					window.regroup = PAR_sort_internal(tdbb, csb, false, count);
				}

				break;

			case blr_window_win_order:
				count = csb->csb_blr_reader.getByte();

				if (count != 0)
					window.order = PAR_sort_internal(tdbb, csb, true, count);

				break;

			case blr_window_win_map:
				window.map = parseMap(tdbb, csb, window.stream, false);
				break;

			case blr_window_win_extent_unit:
				window.frameExtent->unit = (WindowClause::FrameExtent::Unit)
					csb->csb_blr_reader.getByte();

				switch (window.frameExtent->unit)
				{
					case WindowClause::FrameExtent::Unit::RANGE:
					case WindowClause::FrameExtent::Unit::ROWS:
						break;

					default:
						PAR_syntax_error(csb, "blr_window_win_extent_unit");
				}

				break;

			case blr_window_win_exclusion:
				//// TODO: CORE-5338 - write code for execution.
				PAR_error(csb,
					Arg::Gds(isc_wish_list) <<