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Thanks!

I just fleshed out composing CTEs, which is a small step towards the broader goal of making composition easier: https://github.com/max-sixty/prql/commit/dc68fcaaceef26cc078...

Let me know if you have a good case of the sort of composition you find difficult in SQL (either here or in an issue). Thank you!

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I think supporting variables and functions already solves most of my composability gripes with SQL.

Another problem that I have with composing SQL is that large queries quickly become unreadable, and error messages are also often not terribly helpful. I think having a more expressive type system would help with the error messages. Do you have any plans on adding a type system to PRQL?

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