A tax expression needs the revenue alias created from quantity and unit_price. Which shap…

A tax expression needs the revenue alias created from quantity and unit_price. Which shape states that dependency correctly?

1. Chain one with_columns for revenue and a second with_columns for tax.
2. Create revenue and read pl.col("revenue") in sibling expressions in one with_columns.
3. Call collect between the two expressions and then continue on the same LazyFrame.
4. Replace both expressions with a row-wise Python lambda.