Function expandViewStreams

src/dsql/ExprNodes.cpp:96–126

Try to expand the given stream. If it's a view reference, collect its base streams (the ones directly residing in the FROM clause) and recurse.

	// Try to expand the given stream. If it's a view reference, collect its base streams
	// (the ones directly residing in the FROM clause) and recurse.
	void expandViewStreams(CompilerScratch* csb, StreamType baseStream, SortedStreamList& streams)
	{
		const auto csb_tail = &csb->csb_rpt[baseStream];

		const RseNode* const rse =
			csb_tail->csb_relation ? csb_tail->csb_relation->rel_view_rse : NULL;

		// If we have a view, collect its base streams and remap/expand them

		if (rse)
		{
			const auto map = csb_tail->csb_map;
			fb_assert(map);

			StreamList viewStreams;
			rse->computeRseStreams(viewStreams);

			for (auto stream : viewStreams)
			{
				// Remap stream and expand it recursively
				expandViewStreams(csb, map[stream], streams);
			}

			return;
		}

		// Otherwise, just add the current stream to the list

		if (!streams.exist(baseStream))
			streams.add(baseStream);
	}

	// Expand DBKEY for view
	void expandViewNodes(CompilerScratch* csb, StreamType baseStream,