"It's a very interesting piece of evidence of textile advancements in the Anglo-Saxon period," said Willow Major, a post-excavation assistant.
next tuple of R. The selection node repeatedly calls next() on the table scan until it finds a tuple that satisfies a5. It then passes it up to the projection which finally returns it back to you.，这一点在heLLoword翻译官方下载中也有详细论述
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