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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.
，更多细节参见搜狗输入法2026
Фото: Gleb Garanich / Reuters
Make sure we have enough space to draw the progress bars! This is done by writing "\n" * count when the function starts. This creates a series of newlines that makes the terminal scroll, ensuring that there are exactly count blank lines at the bottom of the terminal for the progress bars to be rendered on