High performance data streaming is provided. An intermediate iterator receives a request to process streaming data in a parent request buffer from a parent iterator. The intermediate iterator sends a request to provide a batch of the streaming data in a request child buffer to a child iterator. The intermediate iterator receives the batch of the streaming data in a child response buffer from the child iterator. The intermediate iterator processes the batch of the streaming data. The intermediate iterator sends the processed batch of the streaming data in a response parent buffer to the parent iterator.