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chore: Add debug assertion that verifies the output field of expressions in polars-expr #23649

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@coastalwhite coastalwhite commented Jul 18, 2025

This adds a check to the application of functions to ensure that the engine's reasoning of types matches the planner.

This is probably doing to cause a lot of tests to fail, but I want to have an overview of how bad it is and slowly start fixing these.

@github-actions github-actions bot added internal An internal refactor or improvement python Related to Python Polars rust Related to Rust Polars labels Jul 18, 2025
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