Method getWindowMap

src/dsql/pass1.cpp:3017–3054

Returns (creating, if necessary) the WindowMap of a given partition (that may be NULL).

// Returns (creating, if necessary) the WindowMap of a given partition (that may be NULL).
WindowMap* dsql_ctx::getWindowMap(DsqlCompilerScratch* dsqlScratch, WindowClause* windowNode)
{
	thread_db* tdbb = JRD_get_thread_data();
	MemoryPool& pool = *tdbb->getDefaultPool();

	bool isNullWindow = windowNode == NULL;
	WindowClause nullWindow(pool, NULL, NULL, NULL, NULL, WindowClause::Exclusion::NO_OTHERS);

	if (isNullWindow)
		windowNode = &nullWindow;

	WindowMap* windowMap = NULL;

	for (Array<WindowMap*>::iterator i = ctx_win_maps.begin();
		 !windowMap && i != ctx_win_maps.end();
		 ++i)
	{
		if (PASS1_node_match(dsqlScratch, (*i)->window, windowNode, false))
		{
			windowMap = *i;
		}
	}

	if (!windowMap)
	{
		if (isNullWindow)
		{
			windowNode = FB_NEW_POOL(pool) WindowClause(pool, NULL, NULL, NULL, NULL,
				WindowClause::Exclusion::NO_OTHERS);
		}

		windowMap = FB_NEW_POOL(*tdbb->getDefaultPool()) WindowMap(windowNode);
		ctx_win_maps.add(windowMap);
		windowMap->context = dsqlScratch->contextNumber++;
	}

	return windowMap;
}