What happens?

In the Python stubs, LambdaExpression takes a single lhs argument.

At runtime it works as intended, like in the tests added by the PR, the only problem is Mypy reports an error.

To Reproduce

from duckdb import ColumnExpression, LambdaExpression

LambdaExpression('x', ColumnExpression('x') + 3)

mypy reproduction.py

reproduction.py:3: error: Too many arguments for "LambdaExpression"  [call-arg]
                LambdaExpression('x', ColumnExpression('x') + 3)
                ^

OS:

macOS Sequoia 15.3.1

DuckDB Version:

1.2.0

DuckDB Client:

Python

Hardware:

No response

Full Name:

Tanguy Michardière

Affiliation:

Xpdeep

What is the latest build you tested with? If possible, we recommend testing with the latest nightly build.

I have tested with a stable release

Did you include all relevant data sets for reproducing the issue?

Yes

Did you include all code required to reproduce the issue?

• Yes, I have

Did you include all relevant configuration (e.g., CPU architecture, Python version, Linux distribution) to reproduce the issue?

• Yes, I have