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For example: Being able to start displaying or manipulating rows as they are being returned by a query while the query has not finished searching the table?.. and I don’t mean using the FIRST ROWS directive to hint the engine, I mean transparently, without having to add addtional logic. A feature like this would be useful for queries which take a long time to complete.
If you think about it, that would only work for queries that do not have and ORDER BY or GROUP BY directive. It seems like what you are asking is something like the way a “dump” works, where it starts writing to a file before it’s done reading the table. You could start reading the file, and processing data, before it done dumping.
Some databases support buffered and unbuffered query processing, which is partially what you are looking for.