[Haskell-cafe] Finally tagless and abstract relational Algebra

[Kim-Ee Yeoh]

Günther Schmidt wrote:
> 
> Initially I had simply imported the CSV files into empty tables in a 
> database and done the calculations directly in SQL, never ever again!
> 
> [snip]
> 
> But my 1st goal here is to express the algorithm.
> 

Sounds like you want a better DSL than SQL. You're in massive company.

Conal gives a lot of useful advice on DSL design. 
One way to start is to articulate existing pain. Where and why is SQL
painful? 
Another trick is to work backwards: What kind of code do you really want to
write?

Whether you employ GADTs, initial datatypes, finally-tagless codata, etc.
isn't 
really relevant at this stage. Prematurely latching on to a particular tool
gets
everything treated like a nail, even when they're nowhere close.

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