lokax comments

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                                            lokax

Roadmap v0.2

I want to support column pruning for some operators. Can I have a try 😇 😇

feat(Optimizer): eliminate common sub-expressions

> It's here! #661 Thanks. 😇😇

feat(Optimizer): eliminate common sub-expressions

Some things have been modified.

Invalid float-point literal handling in statements like 'SELECT -0.5;'

@Tishj It seems that TryCast::Operation doesn't handle scale like TryCastFromDecimal/StringCastFromDecimal does, which results in ```cpp query("SELECT 0.5::DECIMAL(18, 1)"); duckdb_value_double(...) // get value 5 ```

[C-API] Decimal casting to other type fixes

It seems that `deprecated_duckdb_translate_column()` always writes DECIMAL into an array of hugeint. Maybe there is no need to distinguish the internal type? This is just my opinion, not necessarily correct.

feat(Optimizer): eliminate common sub-expressions

Thanks for the review. I have no passion to finish it. And the optimizer has been refactored. So I closed this pr.

expr: explicit SIMD

Bounds checking does not allow the compiler to auto-vectorize. Try and test res = vec::from_iter(a.iter().zip(b.iter()).map())