Wei Wei

Generate empty block when necessary.

4

Currently an empty ALTER TYPE ddl like ``` ALTER TYPE Foo {}; ``` will be re-generated by codegen module as ``` ALTER TYPE FOO; ``` , which is invalid syntax....

The first call to pyfunction returning PyDataFrame is slow

3

I found that the very first call to a pyfunction which returns PyDataFrame has a 100ms lag. Here is a minimal reproducible example: > extension ```rust use pyo3_polars::PyDataFrame; use pyo3::prelude::*;...