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willvarfaryesterday at 11:27 PM1 replyview on HN

Can join cardinality can be tackled with cogroup and not expanding the rows until final write?


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Sesse__today at 7:48 AM

I don't know what cogroup is, sorry.

More generally, there are algorithms for multi-way joins (with some theoretical guarantees), but they tend to perform worse in practice than just a set of binary joins with a good implementation.

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