sqlrs
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sqlrs is an in-process sql query engine
Currently, we already have `sqlrs_tables()` and `sqlrs_columns` table function. https://github.com/Fedomn/sqlrs/blob/0bfe264000787201e4dfdea4c9079373f33f344a/src/function/table/sqlrs_tables.rs#L118-L122 Then, we should implement more internal metadata table, such as: - sqlrs_functions()
Implement Python wrapper for sqlrs to make it easier to use. refer to https://pyo3.rs/v0.17.3/
includes UnaryOp(Not/Plus/Minus), IS operator(is null), InList operator(in (v1, v2))