Pretty-printing floating-pont numbersSQL

By casting the result to a `DECIMAL` with a fixed number of digits after the decimal point, we can pretty-print it while keeping it as a numeric value.

Execute this SQL

COPY (FROM VALUES ('foo', 10/9), ('bar', 50/7), ('qux', 9/4) t(s, x))
TO 'example.csv';

SELECT x::DECIMAL(15, 3) AS x
FROM 'example.csv';
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Created 08/13/24