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petrunia.net
In last couple of weeks there has been a tide of ORDER/GROUP BY-related optimization bugs, where I was the fixer or the reviewer. This wasn’t an easy job because there is no sane description of how GROUP BY/ORDER BY handling is supposed to work. To figure it out, I had to write an explanation of how it works. The first part is about ORDER BY. Hopefully there will be subsequent parts that will show
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