So True
I was just reading this from one of the PySpark lessons, and I wish I read it before an interview for a role at a dream company....So true 😔
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Resist the urge to optimize while you write, because premature cleverness costs you twice. Hand-tune before the logic is correct and you risk shipping a wrong answer you cannot even analyze, and you tell the interviewer you reach for tricks before correctness. The professional order is logic first, verified correct, then cost analysis on top of a known-good query. A wrong query whose shuffle you can describe beautifully is still a wrong query, and it fails the part of the bar that came before the tail.
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