Grigory Statsenko added the comment: I can't do that if I don't know how many entries there will be ahead of time. In my real-life situation I'm fetching the data from a database not knowing how many entries I'll get before I actually get them (in the iterator). In most cases there are huge amounts of entries that take up too much memory - that's why I need to stream it. But sometimes the result set is empty - and that's when everything fails.
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