Just-in-time compilation of SQL queries into native code has recently emerged as a viable technique for query processing and an alternative to the dominant interpretation-based approach. We present the salient results of research in this fresh area, addressing all aspects of the query processing stack: from traditional query compilation techniques, to compilation in managed environments, to state-of-the-art approaches on intermediate and native code emission. Throughout the discussion we refer and draw analogies to the general code generation techniques used in contemporary compiler technology. At the same time we describe the open research problems of the area.
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