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> If you missed it, the author does more than reuse the grammar, he used a parser generator, which I think is what iLoveOncall is reacting to.
Huh? He wrote the parser generator. https://github.com/jamii/hytradboi-jam-2022/tree/main/lib/sq...
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If parent is referring to what I think she/he is referring to, then it's something this: https://github.com/ziglang/zig/issues/6768. Keep in mind this is only to do with comptime not runtime. So not ideal, but not catastrophic in the sense of "my program evaluated the wrong conditional branch at runtime!"
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That specific SQLite test suite (one of four [1]) has loads of generated SQL functions, and a long tail of more complex hand-written tests. That 95% of the test suite will be mostly generated queries that follow the same basic pattern of joins and projections with basic arithmetic and comparisons. See for example [2] and [3].
The generated tests are not designed to test a wide breadth of features of the SQL language, and passing them with a simple engine is very doable. A lot of the value of these tests is that the sheer volume of queries tends to find obscure problems in optimizers that would not easily surface otherwise. That is of course not a problem in a simple engine that does not have an optimizer.
[1] https://www.sqlite.org/testing.html#test_harnesses
[2] https://github.com/gregrahn/sqllogictest/blob/master/test/ra...
[3] https://raw.githubusercontent.com/gregrahn/sqllogictest/mast...
